[platform/kernel/linux-rpi.git] / drivers / gpu / drm / i915 / display / intel_display.c

/*
 * Copyright © 2006-2007 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *      Eric Anholt <eric@anholt.net>
 */

#include <acpi/video.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/intel-iommu.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/dma-resv.h>
#include <linux/slab.h>

#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_atomic_uapi.h>
#include <drm/drm_damage_helper.h>
#include <drm/drm_dp_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_plane_helper.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_rect.h>

#include "display/intel_audio.h"
#include "display/intel_crt.h"
#include "display/intel_ddi.h"
#include "display/intel_display_debugfs.h"
#include "display/intel_dp.h"
#include "display/intel_dp_mst.h"
#include "display/intel_dpll.h"
#include "display/intel_dpll_mgr.h"
#include "display/intel_dsi.h"
#include "display/intel_dvo.h"
#include "display/intel_fb.h"
#include "display/intel_gmbus.h"
#include "display/intel_hdmi.h"
#include "display/intel_lvds.h"
#include "display/intel_sdvo.h"
#include "display/intel_snps_phy.h"
#include "display/intel_tv.h"
#include "display/intel_vdsc.h"
#include "display/intel_vrr.h"

#include "gem/i915_gem_lmem.h"
#include "gem/i915_gem_object.h"

#include "gt/intel_rps.h"
#include "gt/gen8_ppgtt.h"

#include "g4x_dp.h"
#include "g4x_hdmi.h"
#include "i915_drv.h"
#include "intel_acpi.h"
#include "intel_atomic.h"
#include "intel_atomic_plane.h"
#include "intel_bw.h"
#include "intel_cdclk.h"
#include "intel_color.h"
#include "intel_crtc.h"
#include "intel_de.h"
#include "intel_display_types.h"
#include "intel_dmc.h"
#include "intel_dp_link_training.h"
#include "intel_dpt.h"
#include "intel_fbc.h"
#include "intel_fdi.h"
#include "intel_fbdev.h"
#include "intel_fifo_underrun.h"
#include "intel_frontbuffer.h"
#include "intel_hdcp.h"
#include "intel_hotplug.h"
#include "intel_overlay.h"
#include "intel_panel.h"
#include "intel_pipe_crc.h"
#include "intel_pm.h"
#include "intel_pps.h"
#include "intel_psr.h"
#include "intel_quirks.h"
#include "intel_sideband.h"
#include "intel_sprite.h"
#include "intel_tc.h"
#include "intel_vga.h"
#include "i9xx_plane.h"
#include "skl_scaler.h"
#include "skl_universal_plane.h"

static void i9xx_crtc_clock_get(struct intel_crtc *crtc,
                                struct intel_crtc_state *pipe_config);
static void ilk_pch_clock_get(struct intel_crtc *crtc,
                              struct intel_crtc_state *pipe_config);

static void intel_set_transcoder_timings(const struct intel_crtc_state *crtc_state);
static void intel_set_pipe_src_size(const struct intel_crtc_state *crtc_state);
static void intel_cpu_transcoder_set_m_n(const struct intel_crtc_state *crtc_state,
                                         const struct intel_link_m_n *m_n,
                                         const struct intel_link_m_n *m2_n2);
static void i9xx_set_pipeconf(const struct intel_crtc_state *crtc_state);
static void ilk_set_pipeconf(const struct intel_crtc_state *crtc_state);
static void hsw_set_pipeconf(const struct intel_crtc_state *crtc_state);
static void bdw_set_pipemisc(const struct intel_crtc_state *crtc_state);
static void ilk_pfit_enable(const struct intel_crtc_state *crtc_state);
static void intel_modeset_setup_hw_state(struct drm_device *dev,
                                         struct drm_modeset_acquire_ctx *ctx);

/* returns HPLL frequency in kHz */
int vlv_get_hpll_vco(struct drm_i915_private *dev_priv)
{
        int hpll_freq, vco_freq[] = { 800, 1600, 2000, 2400 };

        /* Obtain SKU information */
        hpll_freq = vlv_cck_read(dev_priv, CCK_FUSE_REG) &
                CCK_FUSE_HPLL_FREQ_MASK;

        return vco_freq[hpll_freq] * 1000;
}

int vlv_get_cck_clock(struct drm_i915_private *dev_priv,
                      const char *name, u32 reg, int ref_freq)
{
        u32 val;
        int divider;

        val = vlv_cck_read(dev_priv, reg);
        divider = val & CCK_FREQUENCY_VALUES;

        drm_WARN(&dev_priv->drm, (val & CCK_FREQUENCY_STATUS) !=
                 (divider << CCK_FREQUENCY_STATUS_SHIFT),
                 "%s change in progress\n", name);

        return DIV_ROUND_CLOSEST(ref_freq << 1, divider + 1);
}

int vlv_get_cck_clock_hpll(struct drm_i915_private *dev_priv,
                           const char *name, u32 reg)
{
        int hpll;

        vlv_cck_get(dev_priv);

        if (dev_priv->hpll_freq == 0)
                dev_priv->hpll_freq = vlv_get_hpll_vco(dev_priv);

        hpll = vlv_get_cck_clock(dev_priv, name, reg, dev_priv->hpll_freq);

        vlv_cck_put(dev_priv);

        return hpll;
}

static void intel_update_czclk(struct drm_i915_private *dev_priv)
{
        if (!(IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)))
                return;

        dev_priv->czclk_freq = vlv_get_cck_clock_hpll(dev_priv, "czclk",
                                                      CCK_CZ_CLOCK_CONTROL);

        drm_dbg(&dev_priv->drm, "CZ clock rate: %d kHz\n",
                dev_priv->czclk_freq);
}

/* WA Display #0827: Gen9:all */
static void
skl_wa_827(struct drm_i915_private *dev_priv, enum pipe pipe, bool enable)
{
        if (enable)
                intel_de_write(dev_priv, CLKGATE_DIS_PSL(pipe),
                               intel_de_read(dev_priv, CLKGATE_DIS_PSL(pipe)) | DUPS1_GATING_DIS | DUPS2_GATING_DIS);
        else
                intel_de_write(dev_priv, CLKGATE_DIS_PSL(pipe),
                               intel_de_read(dev_priv, CLKGATE_DIS_PSL(pipe)) & ~(DUPS1_GATING_DIS | DUPS2_GATING_DIS));
}

/* Wa_2006604312:icl,ehl */
static void
icl_wa_scalerclkgating(struct drm_i915_private *dev_priv, enum pipe pipe,
                       bool enable)
{
        if (enable)
                intel_de_write(dev_priv, CLKGATE_DIS_PSL(pipe),
                               intel_de_read(dev_priv, CLKGATE_DIS_PSL(pipe)) | DPFR_GATING_DIS);
        else
                intel_de_write(dev_priv, CLKGATE_DIS_PSL(pipe),
                               intel_de_read(dev_priv, CLKGATE_DIS_PSL(pipe)) & ~DPFR_GATING_DIS);
}

static bool
is_trans_port_sync_slave(const struct intel_crtc_state *crtc_state)
{
        return crtc_state->master_transcoder != INVALID_TRANSCODER;
}

static bool
is_trans_port_sync_master(const struct intel_crtc_state *crtc_state)
{
        return crtc_state->sync_mode_slaves_mask != 0;
}

bool
is_trans_port_sync_mode(const struct intel_crtc_state *crtc_state)
{
        return is_trans_port_sync_master(crtc_state) ||
                is_trans_port_sync_slave(crtc_state);
}

static bool pipe_scanline_is_moving(struct drm_i915_private *dev_priv,
                                    enum pipe pipe)
{
        i915_reg_t reg = PIPEDSL(pipe);
        u32 line1, line2;
        u32 line_mask;

        if (DISPLAY_VER(dev_priv) == 2)
                line_mask = DSL_LINEMASK_GEN2;
        else
                line_mask = DSL_LINEMASK_GEN3;

        line1 = intel_de_read(dev_priv, reg) & line_mask;
        msleep(5);
        line2 = intel_de_read(dev_priv, reg) & line_mask;

        return line1 != line2;
}

static void wait_for_pipe_scanline_moving(struct intel_crtc *crtc, bool state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;

        /* Wait for the display line to settle/start moving */
        if (wait_for(pipe_scanline_is_moving(dev_priv, pipe) == state, 100))
                drm_err(&dev_priv->drm,
                        "pipe %c scanline %s wait timed out\n",
                        pipe_name(pipe), onoff(state));
}

static void intel_wait_for_pipe_scanline_stopped(struct intel_crtc *crtc)
{
        wait_for_pipe_scanline_moving(crtc, false);
}

static void intel_wait_for_pipe_scanline_moving(struct intel_crtc *crtc)
{
        wait_for_pipe_scanline_moving(crtc, true);
}

static void
intel_wait_for_pipe_off(const struct intel_crtc_state *old_crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        if (DISPLAY_VER(dev_priv) >= 4) {
                enum transcoder cpu_transcoder = old_crtc_state->cpu_transcoder;
                i915_reg_t reg = PIPECONF(cpu_transcoder);

                /* Wait for the Pipe State to go off */
                if (intel_de_wait_for_clear(dev_priv, reg,
                                            I965_PIPECONF_ACTIVE, 100))
                        drm_WARN(&dev_priv->drm, 1,
                                 "pipe_off wait timed out\n");
        } else {
                intel_wait_for_pipe_scanline_stopped(crtc);
        }
}

/* Only for pre-ILK configs */
void assert_pll(struct drm_i915_private *dev_priv,
                enum pipe pipe, bool state)
{
        u32 val;
        bool cur_state;

        val = intel_de_read(dev_priv, DPLL(pipe));
        cur_state = !!(val & DPLL_VCO_ENABLE);
        I915_STATE_WARN(cur_state != state,
             "PLL state assertion failure (expected %s, current %s)\n",
                        onoff(state), onoff(cur_state));
}

/* XXX: the dsi pll is shared between MIPI DSI ports */
void assert_dsi_pll(struct drm_i915_private *dev_priv, bool state)
{
        u32 val;
        bool cur_state;

        vlv_cck_get(dev_priv);
        val = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL);
        vlv_cck_put(dev_priv);

        cur_state = val & DSI_PLL_VCO_EN;
        I915_STATE_WARN(cur_state != state,
             "DSI PLL state assertion failure (expected %s, current %s)\n",
                        onoff(state), onoff(cur_state));
}

static void assert_fdi_tx(struct drm_i915_private *dev_priv,
                          enum pipe pipe, bool state)
{
        bool cur_state;

        if (HAS_DDI(dev_priv)) {
                /*
                 * DDI does not have a specific FDI_TX register.
                 *
                 * FDI is never fed from EDP transcoder
                 * so pipe->transcoder cast is fine here.
                 */
                enum transcoder cpu_transcoder = (enum transcoder)pipe;
                u32 val = intel_de_read(dev_priv,
                                        TRANS_DDI_FUNC_CTL(cpu_transcoder));
                cur_state = !!(val & TRANS_DDI_FUNC_ENABLE);
        } else {
                u32 val = intel_de_read(dev_priv, FDI_TX_CTL(pipe));
                cur_state = !!(val & FDI_TX_ENABLE);
        }
        I915_STATE_WARN(cur_state != state,
             "FDI TX state assertion failure (expected %s, current %s)\n",
                        onoff(state), onoff(cur_state));
}
#define assert_fdi_tx_enabled(d, p) assert_fdi_tx(d, p, true)
#define assert_fdi_tx_disabled(d, p) assert_fdi_tx(d, p, false)

static void assert_fdi_rx(struct drm_i915_private *dev_priv,
                          enum pipe pipe, bool state)
{
        u32 val;
        bool cur_state;

        val = intel_de_read(dev_priv, FDI_RX_CTL(pipe));
        cur_state = !!(val & FDI_RX_ENABLE);
        I915_STATE_WARN(cur_state != state,
             "FDI RX state assertion failure (expected %s, current %s)\n",
                        onoff(state), onoff(cur_state));
}
#define assert_fdi_rx_enabled(d, p) assert_fdi_rx(d, p, true)
#define assert_fdi_rx_disabled(d, p) assert_fdi_rx(d, p, false)

static void assert_fdi_tx_pll_enabled(struct drm_i915_private *dev_priv,
                                      enum pipe pipe)
{
        u32 val;

        /* ILK FDI PLL is always enabled */
        if (IS_IRONLAKE(dev_priv))
                return;

        /* On Haswell, DDI ports are responsible for the FDI PLL setup */
        if (HAS_DDI(dev_priv))
                return;

        val = intel_de_read(dev_priv, FDI_TX_CTL(pipe));
        I915_STATE_WARN(!(val & FDI_TX_PLL_ENABLE), "FDI TX PLL assertion failure, should be active but is disabled\n");
}

void assert_fdi_rx_pll(struct drm_i915_private *dev_priv,
                       enum pipe pipe, bool state)
{
        u32 val;
        bool cur_state;

        val = intel_de_read(dev_priv, FDI_RX_CTL(pipe));
        cur_state = !!(val & FDI_RX_PLL_ENABLE);
        I915_STATE_WARN(cur_state != state,
             "FDI RX PLL assertion failure (expected %s, current %s)\n",
                        onoff(state), onoff(cur_state));
}

void assert_panel_unlocked(struct drm_i915_private *dev_priv, enum pipe pipe)
{
        i915_reg_t pp_reg;
        u32 val;
        enum pipe panel_pipe = INVALID_PIPE;
        bool locked = true;

        if (drm_WARN_ON(&dev_priv->drm, HAS_DDI(dev_priv)))
                return;

        if (HAS_PCH_SPLIT(dev_priv)) {
                u32 port_sel;

                pp_reg = PP_CONTROL(0);
                port_sel = intel_de_read(dev_priv, PP_ON_DELAYS(0)) & PANEL_PORT_SELECT_MASK;

                switch (port_sel) {
                case PANEL_PORT_SELECT_LVDS:
                        intel_lvds_port_enabled(dev_priv, PCH_LVDS, &panel_pipe);
                        break;
                case PANEL_PORT_SELECT_DPA:
                        g4x_dp_port_enabled(dev_priv, DP_A, PORT_A, &panel_pipe);
                        break;
                case PANEL_PORT_SELECT_DPC:
                        g4x_dp_port_enabled(dev_priv, PCH_DP_C, PORT_C, &panel_pipe);
                        break;
                case PANEL_PORT_SELECT_DPD:
                        g4x_dp_port_enabled(dev_priv, PCH_DP_D, PORT_D, &panel_pipe);
                        break;
                default:
                        MISSING_CASE(port_sel);
                        break;
                }
        } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
                /* presumably write lock depends on pipe, not port select */
                pp_reg = PP_CONTROL(pipe);
                panel_pipe = pipe;
        } else {
                u32 port_sel;

                pp_reg = PP_CONTROL(0);
                port_sel = intel_de_read(dev_priv, PP_ON_DELAYS(0)) & PANEL_PORT_SELECT_MASK;

                drm_WARN_ON(&dev_priv->drm,
                            port_sel != PANEL_PORT_SELECT_LVDS);
                intel_lvds_port_enabled(dev_priv, LVDS, &panel_pipe);
        }

        val = intel_de_read(dev_priv, pp_reg);
        if (!(val & PANEL_POWER_ON) ||
            ((val & PANEL_UNLOCK_MASK) == PANEL_UNLOCK_REGS))
                locked = false;

        I915_STATE_WARN(panel_pipe == pipe && locked,
             "panel assertion failure, pipe %c regs locked\n",
             pipe_name(pipe));
}

void assert_pipe(struct drm_i915_private *dev_priv,
                 enum transcoder cpu_transcoder, bool state)
{
        bool cur_state;
        enum intel_display_power_domain power_domain;
        intel_wakeref_t wakeref;

        /* we keep both pipes enabled on 830 */
        if (IS_I830(dev_priv))
                state = true;

        power_domain = POWER_DOMAIN_TRANSCODER(cpu_transcoder);
        wakeref = intel_display_power_get_if_enabled(dev_priv, power_domain);
        if (wakeref) {
                u32 val = intel_de_read(dev_priv, PIPECONF(cpu_transcoder));
                cur_state = !!(val & PIPECONF_ENABLE);

                intel_display_power_put(dev_priv, power_domain, wakeref);
        } else {
                cur_state = false;
        }

        I915_STATE_WARN(cur_state != state,
                        "transcoder %s assertion failure (expected %s, current %s)\n",
                        transcoder_name(cpu_transcoder),
                        onoff(state), onoff(cur_state));
}

static void assert_plane(struct intel_plane *plane, bool state)
{
        enum pipe pipe;
        bool cur_state;

        cur_state = plane->get_hw_state(plane, &pipe);

        I915_STATE_WARN(cur_state != state,
                        "%s assertion failure (expected %s, current %s)\n",
                        plane->base.name, onoff(state), onoff(cur_state));
}

#define assert_plane_enabled(p) assert_plane(p, true)
#define assert_plane_disabled(p) assert_plane(p, false)

static void assert_planes_disabled(struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct intel_plane *plane;

        for_each_intel_plane_on_crtc(&dev_priv->drm, crtc, plane)
                assert_plane_disabled(plane);
}

void assert_pch_transcoder_disabled(struct drm_i915_private *dev_priv,
                                    enum pipe pipe)
{
        u32 val;
        bool enabled;

        val = intel_de_read(dev_priv, PCH_TRANSCONF(pipe));
        enabled = !!(val & TRANS_ENABLE);
        I915_STATE_WARN(enabled,
             "transcoder assertion failed, should be off on pipe %c but is still active\n",
             pipe_name(pipe));
}

static void assert_pch_dp_disabled(struct drm_i915_private *dev_priv,
                                   enum pipe pipe, enum port port,
                                   i915_reg_t dp_reg)
{
        enum pipe port_pipe;
        bool state;

        state = g4x_dp_port_enabled(dev_priv, dp_reg, port, &port_pipe);

        I915_STATE_WARN(state && port_pipe == pipe,
                        "PCH DP %c enabled on transcoder %c, should be disabled\n",
                        port_name(port), pipe_name(pipe));

        I915_STATE_WARN(HAS_PCH_IBX(dev_priv) && !state && port_pipe == PIPE_B,
                        "IBX PCH DP %c still using transcoder B\n",
                        port_name(port));
}

static void assert_pch_hdmi_disabled(struct drm_i915_private *dev_priv,
                                     enum pipe pipe, enum port port,
                                     i915_reg_t hdmi_reg)
{
        enum pipe port_pipe;
        bool state;

        state = intel_sdvo_port_enabled(dev_priv, hdmi_reg, &port_pipe);

        I915_STATE_WARN(state && port_pipe == pipe,
                        "PCH HDMI %c enabled on transcoder %c, should be disabled\n",
                        port_name(port), pipe_name(pipe));

        I915_STATE_WARN(HAS_PCH_IBX(dev_priv) && !state && port_pipe == PIPE_B,
                        "IBX PCH HDMI %c still using transcoder B\n",
                        port_name(port));
}

static void assert_pch_ports_disabled(struct drm_i915_private *dev_priv,
                                      enum pipe pipe)
{
        enum pipe port_pipe;

        assert_pch_dp_disabled(dev_priv, pipe, PORT_B, PCH_DP_B);
        assert_pch_dp_disabled(dev_priv, pipe, PORT_C, PCH_DP_C);
        assert_pch_dp_disabled(dev_priv, pipe, PORT_D, PCH_DP_D);

        I915_STATE_WARN(intel_crt_port_enabled(dev_priv, PCH_ADPA, &port_pipe) &&
                        port_pipe == pipe,
                        "PCH VGA enabled on transcoder %c, should be disabled\n",
                        pipe_name(pipe));

        I915_STATE_WARN(intel_lvds_port_enabled(dev_priv, PCH_LVDS, &port_pipe) &&
                        port_pipe == pipe,
                        "PCH LVDS enabled on transcoder %c, should be disabled\n",
                        pipe_name(pipe));

        /* PCH SDVOB multiplex with HDMIB */
        assert_pch_hdmi_disabled(dev_priv, pipe, PORT_B, PCH_HDMIB);
        assert_pch_hdmi_disabled(dev_priv, pipe, PORT_C, PCH_HDMIC);
        assert_pch_hdmi_disabled(dev_priv, pipe, PORT_D, PCH_HDMID);
}

void vlv_wait_port_ready(struct drm_i915_private *dev_priv,
                         struct intel_digital_port *dig_port,
                         unsigned int expected_mask)
{
        u32 port_mask;
        i915_reg_t dpll_reg;

        switch (dig_port->base.port) {
        case PORT_B:
                port_mask = DPLL_PORTB_READY_MASK;
                dpll_reg = DPLL(0);
                break;
        case PORT_C:
                port_mask = DPLL_PORTC_READY_MASK;
                dpll_reg = DPLL(0);
                expected_mask <<= 4;
                break;
        case PORT_D:
                port_mask = DPLL_PORTD_READY_MASK;
                dpll_reg = DPIO_PHY_STATUS;
                break;
        default:
                BUG();
        }

        if (intel_de_wait_for_register(dev_priv, dpll_reg,
                                       port_mask, expected_mask, 1000))
                drm_WARN(&dev_priv->drm, 1,
                         "timed out waiting for [ENCODER:%d:%s] port ready: got 0x%x, expected 0x%x\n",
                         dig_port->base.base.base.id, dig_port->base.base.name,
                         intel_de_read(dev_priv, dpll_reg) & port_mask,
                         expected_mask);
}

static void ilk_enable_pch_transcoder(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;
        i915_reg_t reg;
        u32 val, pipeconf_val;

        /* Make sure PCH DPLL is enabled */
        assert_shared_dpll_enabled(dev_priv, crtc_state->shared_dpll);

        /* FDI must be feeding us bits for PCH ports */
        assert_fdi_tx_enabled(dev_priv, pipe);
        assert_fdi_rx_enabled(dev_priv, pipe);

        if (HAS_PCH_CPT(dev_priv)) {
                reg = TRANS_CHICKEN2(pipe);
                val = intel_de_read(dev_priv, reg);
                /*
                 * Workaround: Set the timing override bit
                 * before enabling the pch transcoder.
                 */
                val |= TRANS_CHICKEN2_TIMING_OVERRIDE;
                /* Configure frame start delay to match the CPU */
                val &= ~TRANS_CHICKEN2_FRAME_START_DELAY_MASK;
                val |= TRANS_CHICKEN2_FRAME_START_DELAY(dev_priv->framestart_delay - 1);
                intel_de_write(dev_priv, reg, val);
        }

        reg = PCH_TRANSCONF(pipe);
        val = intel_de_read(dev_priv, reg);
        pipeconf_val = intel_de_read(dev_priv, PIPECONF(pipe));

        if (HAS_PCH_IBX(dev_priv)) {
                /* Configure frame start delay to match the CPU */
                val &= ~TRANS_FRAME_START_DELAY_MASK;
                val |= TRANS_FRAME_START_DELAY(dev_priv->framestart_delay - 1);

                /*
                 * Make the BPC in transcoder be consistent with
                 * that in pipeconf reg. For HDMI we must use 8bpc
                 * here for both 8bpc and 12bpc.
                 */
                val &= ~PIPECONF_BPC_MASK;
                if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI))
                        val |= PIPECONF_8BPC;
                else
                        val |= pipeconf_val & PIPECONF_BPC_MASK;
        }

        val &= ~TRANS_INTERLACE_MASK;
        if ((pipeconf_val & PIPECONF_INTERLACE_MASK) == PIPECONF_INTERLACED_ILK) {
                if (HAS_PCH_IBX(dev_priv) &&
                    intel_crtc_has_type(crtc_state, INTEL_OUTPUT_SDVO))
                        val |= TRANS_LEGACY_INTERLACED_ILK;
                else
                        val |= TRANS_INTERLACED;
        } else {
                val |= TRANS_PROGRESSIVE;
        }

        intel_de_write(dev_priv, reg, val | TRANS_ENABLE);
        if (intel_de_wait_for_set(dev_priv, reg, TRANS_STATE_ENABLE, 100))
                drm_err(&dev_priv->drm, "failed to enable transcoder %c\n",
                        pipe_name(pipe));
}

static void lpt_enable_pch_transcoder(struct drm_i915_private *dev_priv,
                                      enum transcoder cpu_transcoder)
{
        u32 val, pipeconf_val;

        /* FDI must be feeding us bits for PCH ports */
        assert_fdi_tx_enabled(dev_priv, (enum pipe) cpu_transcoder);
        assert_fdi_rx_enabled(dev_priv, PIPE_A);

        val = intel_de_read(dev_priv, TRANS_CHICKEN2(PIPE_A));
        /* Workaround: set timing override bit. */
        val |= TRANS_CHICKEN2_TIMING_OVERRIDE;
        /* Configure frame start delay to match the CPU */
        val &= ~TRANS_CHICKEN2_FRAME_START_DELAY_MASK;
        val |= TRANS_CHICKEN2_FRAME_START_DELAY(dev_priv->framestart_delay - 1);
        intel_de_write(dev_priv, TRANS_CHICKEN2(PIPE_A), val);

        val = TRANS_ENABLE;
        pipeconf_val = intel_de_read(dev_priv, PIPECONF(cpu_transcoder));

        if ((pipeconf_val & PIPECONF_INTERLACE_MASK_HSW) ==
            PIPECONF_INTERLACED_ILK)
                val |= TRANS_INTERLACED;
        else
                val |= TRANS_PROGRESSIVE;

        intel_de_write(dev_priv, LPT_TRANSCONF, val);
        if (intel_de_wait_for_set(dev_priv, LPT_TRANSCONF,
                                  TRANS_STATE_ENABLE, 100))
                drm_err(&dev_priv->drm, "Failed to enable PCH transcoder\n");
}

static void ilk_disable_pch_transcoder(struct drm_i915_private *dev_priv,
                                       enum pipe pipe)
{
        i915_reg_t reg;
        u32 val;

        /* FDI relies on the transcoder */
        assert_fdi_tx_disabled(dev_priv, pipe);
        assert_fdi_rx_disabled(dev_priv, pipe);

        /* Ports must be off as well */
        assert_pch_ports_disabled(dev_priv, pipe);

        reg = PCH_TRANSCONF(pipe);
        val = intel_de_read(dev_priv, reg);
        val &= ~TRANS_ENABLE;
        intel_de_write(dev_priv, reg, val);
        /* wait for PCH transcoder off, transcoder state */
        if (intel_de_wait_for_clear(dev_priv, reg, TRANS_STATE_ENABLE, 50))
                drm_err(&dev_priv->drm, "failed to disable transcoder %c\n",
                        pipe_name(pipe));

        if (HAS_PCH_CPT(dev_priv)) {
                /* Workaround: Clear the timing override chicken bit again. */
                reg = TRANS_CHICKEN2(pipe);
                val = intel_de_read(dev_priv, reg);
                val &= ~TRANS_CHICKEN2_TIMING_OVERRIDE;
                intel_de_write(dev_priv, reg, val);
        }
}

void lpt_disable_pch_transcoder(struct drm_i915_private *dev_priv)
{
        u32 val;

        val = intel_de_read(dev_priv, LPT_TRANSCONF);
        val &= ~TRANS_ENABLE;
        intel_de_write(dev_priv, LPT_TRANSCONF, val);
        /* wait for PCH transcoder off, transcoder state */
        if (intel_de_wait_for_clear(dev_priv, LPT_TRANSCONF,
                                    TRANS_STATE_ENABLE, 50))
                drm_err(&dev_priv->drm, "Failed to disable PCH transcoder\n");

        /* Workaround: clear timing override bit. */
        val = intel_de_read(dev_priv, TRANS_CHICKEN2(PIPE_A));
        val &= ~TRANS_CHICKEN2_TIMING_OVERRIDE;
        intel_de_write(dev_priv, TRANS_CHICKEN2(PIPE_A), val);
}

enum pipe intel_crtc_pch_transcoder(struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        if (HAS_PCH_LPT(dev_priv))
                return PIPE_A;
        else
                return crtc->pipe;
}

void intel_enable_pipe(const struct intel_crtc_state *new_crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(new_crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum transcoder cpu_transcoder = new_crtc_state->cpu_transcoder;
        enum pipe pipe = crtc->pipe;
        i915_reg_t reg;
        u32 val;

        drm_dbg_kms(&dev_priv->drm, "enabling pipe %c\n", pipe_name(pipe));

        assert_planes_disabled(crtc);

        /*
         * A pipe without a PLL won't actually be able to drive bits from
         * a plane.  On ILK+ the pipe PLLs are integrated, so we don't
         * need the check.
         */
        if (HAS_GMCH(dev_priv)) {
                if (intel_crtc_has_type(new_crtc_state, INTEL_OUTPUT_DSI))
                        assert_dsi_pll_enabled(dev_priv);
                else
                        assert_pll_enabled(dev_priv, pipe);
        } else {
                if (new_crtc_state->has_pch_encoder) {
                        /* if driving the PCH, we need FDI enabled */
                        assert_fdi_rx_pll_enabled(dev_priv,
                                                  intel_crtc_pch_transcoder(crtc));
                        assert_fdi_tx_pll_enabled(dev_priv,
                                                  (enum pipe) cpu_transcoder);
                }
                /* FIXME: assert CPU port conditions for SNB+ */
        }

        /* Wa_22012358565:adl-p */
        if (DISPLAY_VER(dev_priv) == 13)
                intel_de_rmw(dev_priv, PIPE_ARB_CTL(pipe),
                             0, PIPE_ARB_USE_PROG_SLOTS);

        reg = PIPECONF(cpu_transcoder);
        val = intel_de_read(dev_priv, reg);
        if (val & PIPECONF_ENABLE) {
                /* we keep both pipes enabled on 830 */
                drm_WARN_ON(&dev_priv->drm, !IS_I830(dev_priv));
                return;
        }

        intel_de_write(dev_priv, reg, val | PIPECONF_ENABLE);
        intel_de_posting_read(dev_priv, reg);

        /*
         * Until the pipe starts PIPEDSL reads will return a stale value,
         * which causes an apparent vblank timestamp jump when PIPEDSL
         * resets to its proper value. That also messes up the frame count
         * when it's derived from the timestamps. So let's wait for the
         * pipe to start properly before we call drm_crtc_vblank_on()
         */
        if (intel_crtc_max_vblank_count(new_crtc_state) == 0)
                intel_wait_for_pipe_scanline_moving(crtc);
}

void intel_disable_pipe(const struct intel_crtc_state *old_crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum transcoder cpu_transcoder = old_crtc_state->cpu_transcoder;
        enum pipe pipe = crtc->pipe;
        i915_reg_t reg;
        u32 val;

        drm_dbg_kms(&dev_priv->drm, "disabling pipe %c\n", pipe_name(pipe));

        /*
         * Make sure planes won't keep trying to pump pixels to us,
         * or we might hang the display.
         */
        assert_planes_disabled(crtc);

        reg = PIPECONF(cpu_transcoder);
        val = intel_de_read(dev_priv, reg);
        if ((val & PIPECONF_ENABLE) == 0)
                return;

        /*
         * Double wide has implications for planes
         * so best keep it disabled when not needed.
         */
        if (old_crtc_state->double_wide)
                val &= ~PIPECONF_DOUBLE_WIDE;

        /* Don't disable pipe or pipe PLLs if needed */
        if (!IS_I830(dev_priv))
                val &= ~PIPECONF_ENABLE;

        if (DISPLAY_VER(dev_priv) >= 12)
                intel_de_rmw(dev_priv, CHICKEN_TRANS(cpu_transcoder),
                             FECSTALL_DIS_DPTSTREAM_DPTTG, 0);

        intel_de_write(dev_priv, reg, val);
        if ((val & PIPECONF_ENABLE) == 0)
                intel_wait_for_pipe_off(old_crtc_state);
}

bool
intel_format_info_is_yuv_semiplanar(const struct drm_format_info *info,
                                    u64 modifier)
{
        return info->is_yuv &&
               info->num_planes == (is_ccs_modifier(modifier) ? 4 : 2);
}

unsigned int intel_rotation_info_size(const struct intel_rotation_info *rot_info)
{
        unsigned int size = 0;
        int i;

        for (i = 0 ; i < ARRAY_SIZE(rot_info->plane); i++)
                size += rot_info->plane[i].dst_stride * rot_info->plane[i].width;

        return size;
}

unsigned int intel_remapped_info_size(const struct intel_remapped_info *rem_info)
{
        unsigned int size = 0;
        int i;

        for (i = 0 ; i < ARRAY_SIZE(rem_info->plane); i++)
                size += rem_info->plane[i].dst_stride * rem_info->plane[i].height;

        return size;
}

static bool intel_plane_uses_fence(const struct intel_plane_state *plane_state)
{
        struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);

        return DISPLAY_VER(dev_priv) < 4 ||
                (plane->has_fbc &&
                 plane_state->view.gtt.type == I915_GGTT_VIEW_NORMAL);
}

static struct i915_vma *
intel_pin_fb_obj_dpt(struct drm_framebuffer *fb,
                     const struct i915_ggtt_view *view,
                     bool uses_fence,
                     unsigned long *out_flags,
                     struct i915_address_space *vm)
{
        struct drm_device *dev = fb->dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_i915_gem_object *obj = intel_fb_obj(fb);
        struct i915_vma *vma;
        u32 alignment;
        int ret;

        if (WARN_ON(!i915_gem_object_is_framebuffer(obj)))
                return ERR_PTR(-EINVAL);

        alignment = 4096 * 512;

        atomic_inc(&dev_priv->gpu_error.pending_fb_pin);

        ret = i915_gem_object_set_cache_level(obj, I915_CACHE_NONE);
        if (ret) {
                vma = ERR_PTR(ret);
                goto err;
        }

        vma = i915_vma_instance(obj, vm, view);
        if (IS_ERR(vma))
                goto err;

        if (i915_vma_misplaced(vma, 0, alignment, 0)) {
                ret = i915_vma_unbind(vma);
                if (ret) {
                        vma = ERR_PTR(ret);
                        goto err;
                }
        }

        ret = i915_vma_pin(vma, 0, alignment, PIN_GLOBAL);
        if (ret) {
                vma = ERR_PTR(ret);
                goto err;
        }

        vma->display_alignment = max_t(u64, vma->display_alignment, alignment);

        i915_gem_object_flush_if_display(obj);

        i915_vma_get(vma);
err:
        atomic_dec(&dev_priv->gpu_error.pending_fb_pin);

        return vma;
}

struct i915_vma *
intel_pin_and_fence_fb_obj(struct drm_framebuffer *fb,
                           bool phys_cursor,
                           const struct i915_ggtt_view *view,
                           bool uses_fence,
                           unsigned long *out_flags)
{
        struct drm_device *dev = fb->dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_i915_gem_object *obj = intel_fb_obj(fb);
        intel_wakeref_t wakeref;
        struct i915_gem_ww_ctx ww;
        struct i915_vma *vma;
        unsigned int pinctl;
        u32 alignment;
        int ret;

        if (drm_WARN_ON(dev, !i915_gem_object_is_framebuffer(obj)))
                return ERR_PTR(-EINVAL);

        if (phys_cursor)
                alignment = intel_cursor_alignment(dev_priv);
        else
                alignment = intel_surf_alignment(fb, 0);
        if (drm_WARN_ON(dev, alignment && !is_power_of_2(alignment)))
                return ERR_PTR(-EINVAL);

        /* Note that the w/a also requires 64 PTE of padding following the
         * bo. We currently fill all unused PTE with the shadow page and so
         * we should always have valid PTE following the scanout preventing
         * the VT-d warning.
         */
        if (intel_scanout_needs_vtd_wa(dev_priv) && alignment < 256 * 1024)
                alignment = 256 * 1024;

        /*
         * Global gtt pte registers are special registers which actually forward
         * writes to a chunk of system memory. Which means that there is no risk
         * that the register values disappear as soon as we call
         * intel_runtime_pm_put(), so it is correct to wrap only the
         * pin/unpin/fence and not more.
         */
        wakeref = intel_runtime_pm_get(&dev_priv->runtime_pm);

        atomic_inc(&dev_priv->gpu_error.pending_fb_pin);

        /*
         * Valleyview is definitely limited to scanning out the first
         * 512MiB. Lets presume this behaviour was inherited from the
         * g4x display engine and that all earlier gen are similarly
         * limited. Testing suggests that it is a little more
         * complicated than this. For example, Cherryview appears quite
         * happy to scanout from anywhere within its global aperture.
         */
        pinctl = 0;
        if (HAS_GMCH(dev_priv))
                pinctl |= PIN_MAPPABLE;

        i915_gem_ww_ctx_init(&ww, true);
retry:
        ret = i915_gem_object_lock(obj, &ww);
        if (!ret && phys_cursor)
                ret = i915_gem_object_attach_phys(obj, alignment);
        else if (!ret && HAS_LMEM(dev_priv))
                ret = i915_gem_object_migrate(obj, &ww, INTEL_REGION_LMEM);
        /* TODO: Do we need to sync when migration becomes async? */
        if (!ret)
                ret = i915_gem_object_pin_pages(obj);
        if (ret)
                goto err;

        if (!ret) {
                vma = i915_gem_object_pin_to_display_plane(obj, &ww, alignment,
                                                           view, pinctl);
                if (IS_ERR(vma)) {
                        ret = PTR_ERR(vma);
                        goto err_unpin;
                }
        }

        if (uses_fence && i915_vma_is_map_and_fenceable(vma)) {
                /*
                 * Install a fence for tiled scan-out. Pre-i965 always needs a
                 * fence, whereas 965+ only requires a fence if using
                 * framebuffer compression.  For simplicity, we always, when
                 * possible, install a fence as the cost is not that onerous.
                 *
                 * If we fail to fence the tiled scanout, then either the
                 * modeset will reject the change (which is highly unlikely as
                 * the affected systems, all but one, do not have unmappable
                 * space) or we will not be able to enable full powersaving
                 * techniques (also likely not to apply due to various limits
                 * FBC and the like impose on the size of the buffer, which
                 * presumably we violated anyway with this unmappable buffer).
                 * Anyway, it is presumably better to stumble onwards with
                 * something and try to run the system in a "less than optimal"
                 * mode that matches the user configuration.
                 */
                ret = i915_vma_pin_fence(vma);
                if (ret != 0 && DISPLAY_VER(dev_priv) < 4) {
                        i915_vma_unpin(vma);
                        goto err_unpin;
                }
                ret = 0;

                if (vma->fence)
                        *out_flags |= PLANE_HAS_FENCE;
        }

        i915_vma_get(vma);

err_unpin:
        i915_gem_object_unpin_pages(obj);
err:
        if (ret == -EDEADLK) {
                ret = i915_gem_ww_ctx_backoff(&ww);
                if (!ret)
                        goto retry;
        }
        i915_gem_ww_ctx_fini(&ww);
        if (ret)
                vma = ERR_PTR(ret);

        atomic_dec(&dev_priv->gpu_error.pending_fb_pin);
        intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
        return vma;
}

void intel_unpin_fb_vma(struct i915_vma *vma, unsigned long flags)
{
        if (flags & PLANE_HAS_FENCE)
                i915_vma_unpin_fence(vma);
        i915_vma_unpin(vma);
        i915_vma_put(vma);
}

/*
 * Convert the x/y offsets into a linear offset.
 * Only valid with 0/180 degree rotation, which is fine since linear
 * offset is only used with linear buffers on pre-hsw and tiled buffers
 * with gen2/3, and 90/270 degree rotations isn't supported on any of them.
 */
u32 intel_fb_xy_to_linear(int x, int y,
                          const struct intel_plane_state *state,
                          int color_plane)
{
        const struct drm_framebuffer *fb = state->hw.fb;
        unsigned int cpp = fb->format->cpp[color_plane];
        unsigned int pitch = state->view.color_plane[color_plane].stride;

        return y * pitch + x * cpp;
}

/*
 * Add the x/y offsets derived from fb->offsets[] to the user
 * specified plane src x/y offsets. The resulting x/y offsets
 * specify the start of scanout from the beginning of the gtt mapping.
 */
void intel_add_fb_offsets(int *x, int *y,
                          const struct intel_plane_state *state,
                          int color_plane)

{
        *x += state->view.color_plane[color_plane].x;
        *y += state->view.color_plane[color_plane].y;
}

/*
 * From the Sky Lake PRM:
 * "The Color Control Surface (CCS) contains the compression status of
 *  the cache-line pairs. The compression state of the cache-line pair
 *  is specified by 2 bits in the CCS. Each CCS cache-line represents
 *  an area on the main surface of 16 x16 sets of 128 byte Y-tiled
 *  cache-line-pairs. CCS is always Y tiled."
 *
 * Since cache line pairs refers to horizontally adjacent cache lines,
 * each cache line in the CCS corresponds to an area of 32x16 cache
 * lines on the main surface. Since each pixel is 4 bytes, this gives
 * us a ratio of one byte in the CCS for each 8x16 pixels in the
 * main surface.
 */
static const struct drm_format_info skl_ccs_formats[] = {
        { .format = DRM_FORMAT_XRGB8888, .depth = 24, .num_planes = 2,
          .cpp = { 4, 1, }, .hsub = 8, .vsub = 16, },
        { .format = DRM_FORMAT_XBGR8888, .depth = 24, .num_planes = 2,
          .cpp = { 4, 1, }, .hsub = 8, .vsub = 16, },
        { .format = DRM_FORMAT_ARGB8888, .depth = 32, .num_planes = 2,
          .cpp = { 4, 1, }, .hsub = 8, .vsub = 16, .has_alpha = true, },
        { .format = DRM_FORMAT_ABGR8888, .depth = 32, .num_planes = 2,
          .cpp = { 4, 1, }, .hsub = 8, .vsub = 16, .has_alpha = true, },
};

/*
 * Gen-12 compression uses 4 bits of CCS data for each cache line pair in the
 * main surface. And each 64B CCS cache line represents an area of 4x1 Y-tiles
 * in the main surface. With 4 byte pixels and each Y-tile having dimensions of
 * 32x32 pixels, the ratio turns out to 1B in the CCS for every 2x32 pixels in
 * the main surface.
 */
static const struct drm_format_info gen12_ccs_formats[] = {
        { .format = DRM_FORMAT_XRGB8888, .depth = 24, .num_planes = 2,
          .char_per_block = { 4, 1 }, .block_w = { 1, 2 }, .block_h = { 1, 1 },
          .hsub = 1, .vsub = 1, },
        { .format = DRM_FORMAT_XBGR8888, .depth = 24, .num_planes = 2,
          .char_per_block = { 4, 1 }, .block_w = { 1, 2 }, .block_h = { 1, 1 },
          .hsub = 1, .vsub = 1, },
        { .format = DRM_FORMAT_ARGB8888, .depth = 32, .num_planes = 2,
          .char_per_block = { 4, 1 }, .block_w = { 1, 2 }, .block_h = { 1, 1 },
          .hsub = 1, .vsub = 1, .has_alpha = true },
        { .format = DRM_FORMAT_ABGR8888, .depth = 32, .num_planes = 2,
          .char_per_block = { 4, 1 }, .block_w = { 1, 2 }, .block_h = { 1, 1 },
          .hsub = 1, .vsub = 1, .has_alpha = true },
        { .format = DRM_FORMAT_YUYV, .num_planes = 2,
          .char_per_block = { 2, 1 }, .block_w = { 1, 2 }, .block_h = { 1, 1 },
          .hsub = 2, .vsub = 1, .is_yuv = true },
        { .format = DRM_FORMAT_YVYU, .num_planes = 2,
          .char_per_block = { 2, 1 }, .block_w = { 1, 2 }, .block_h = { 1, 1 },
          .hsub = 2, .vsub = 1, .is_yuv = true },
        { .format = DRM_FORMAT_UYVY, .num_planes = 2,
          .char_per_block = { 2, 1 }, .block_w = { 1, 2 }, .block_h = { 1, 1 },
          .hsub = 2, .vsub = 1, .is_yuv = true },
        { .format = DRM_FORMAT_VYUY, .num_planes = 2,
          .char_per_block = { 2, 1 }, .block_w = { 1, 2 }, .block_h = { 1, 1 },
          .hsub = 2, .vsub = 1, .is_yuv = true },
        { .format = DRM_FORMAT_XYUV8888, .num_planes = 2,
          .char_per_block = { 4, 1 }, .block_w = { 1, 2 }, .block_h = { 1, 1 },
          .hsub = 1, .vsub = 1, .is_yuv = true },
        { .format = DRM_FORMAT_NV12, .num_planes = 4,
          .char_per_block = { 1, 2, 1, 1 }, .block_w = { 1, 1, 4, 4 }, .block_h = { 1, 1, 1, 1 },
          .hsub = 2, .vsub = 2, .is_yuv = true },
        { .format = DRM_FORMAT_P010, .num_planes = 4,
          .char_per_block = { 2, 4, 1, 1 }, .block_w = { 1, 1, 2, 2 }, .block_h = { 1, 1, 1, 1 },
          .hsub = 2, .vsub = 2, .is_yuv = true },
        { .format = DRM_FORMAT_P012, .num_planes = 4,
          .char_per_block = { 2, 4, 1, 1 }, .block_w = { 1, 1, 2, 2 }, .block_h = { 1, 1, 1, 1 },
          .hsub = 2, .vsub = 2, .is_yuv = true },
        { .format = DRM_FORMAT_P016, .num_planes = 4,
          .char_per_block = { 2, 4, 1, 1 }, .block_w = { 1, 1, 2, 2 }, .block_h = { 1, 1, 1, 1 },
          .hsub = 2, .vsub = 2, .is_yuv = true },
};

/*
 * Same as gen12_ccs_formats[] above, but with additional surface used
 * to pass Clear Color information in plane 2 with 64 bits of data.
 */
static const struct drm_format_info gen12_ccs_cc_formats[] = {
        { .format = DRM_FORMAT_XRGB8888, .depth = 24, .num_planes = 3,
          .char_per_block = { 4, 1, 0 }, .block_w = { 1, 2, 2 }, .block_h = { 1, 1, 1 },
          .hsub = 1, .vsub = 1, },
        { .format = DRM_FORMAT_XBGR8888, .depth = 24, .num_planes = 3,
          .char_per_block = { 4, 1, 0 }, .block_w = { 1, 2, 2 }, .block_h = { 1, 1, 1 },
          .hsub = 1, .vsub = 1, },
        { .format = DRM_FORMAT_ARGB8888, .depth = 32, .num_planes = 3,
          .char_per_block = { 4, 1, 0 }, .block_w = { 1, 2, 2 }, .block_h = { 1, 1, 1 },
          .hsub = 1, .vsub = 1, .has_alpha = true },
        { .format = DRM_FORMAT_ABGR8888, .depth = 32, .num_planes = 3,
          .char_per_block = { 4, 1, 0 }, .block_w = { 1, 2, 2 }, .block_h = { 1, 1, 1 },
          .hsub = 1, .vsub = 1, .has_alpha = true },
};

static const struct drm_format_info *
lookup_format_info(const struct drm_format_info formats[],
                   int num_formats, u32 format)
{
        int i;

        for (i = 0; i < num_formats; i++) {
                if (formats[i].format == format)
                        return &formats[i];
        }

        return NULL;
}

static const struct drm_format_info *
intel_get_format_info(const struct drm_mode_fb_cmd2 *cmd)
{
        switch (cmd->modifier[0]) {
        case I915_FORMAT_MOD_Y_TILED_CCS:
        case I915_FORMAT_MOD_Yf_TILED_CCS:
                return lookup_format_info(skl_ccs_formats,
                                          ARRAY_SIZE(skl_ccs_formats),
                                          cmd->pixel_format);
        case I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS:
        case I915_FORMAT_MOD_Y_TILED_GEN12_MC_CCS:
                return lookup_format_info(gen12_ccs_formats,
                                          ARRAY_SIZE(gen12_ccs_formats),
                                          cmd->pixel_format);
        case I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS_CC:
                return lookup_format_info(gen12_ccs_cc_formats,
                                          ARRAY_SIZE(gen12_ccs_cc_formats),
                                          cmd->pixel_format);
        default:
                return NULL;
        }
}

u32 intel_plane_fb_max_stride(struct drm_i915_private *dev_priv,
                              u32 pixel_format, u64 modifier)
{
        struct intel_crtc *crtc;
        struct intel_plane *plane;

        if (!HAS_DISPLAY(dev_priv))
                return 0;

        /*
         * We assume the primary plane for pipe A has
         * the highest stride limits of them all,
         * if in case pipe A is disabled, use the first pipe from pipe_mask.
         */
        crtc = intel_get_first_crtc(dev_priv);
        if (!crtc)
                return 0;

        plane = to_intel_plane(crtc->base.primary);

        return plane->max_stride(plane, pixel_format, modifier,
                                 DRM_MODE_ROTATE_0);
}

static struct i915_vma *
initial_plane_vma(struct drm_i915_private *i915,
                  struct intel_initial_plane_config *plane_config)
{
        struct drm_i915_gem_object *obj;
        struct i915_vma *vma;
        u32 base, size;

        if (plane_config->size == 0)
                return NULL;

        base = round_down(plane_config->base,
                          I915_GTT_MIN_ALIGNMENT);
        size = round_up(plane_config->base + plane_config->size,
                        I915_GTT_MIN_ALIGNMENT);
        size -= base;

        /*
         * If the FB is too big, just don't use it since fbdev is not very
         * important and we should probably use that space with FBC or other
         * features.
         */
        if (IS_ENABLED(CONFIG_FRAMEBUFFER_CONSOLE) &&
            size * 2 > i915->stolen_usable_size)
                return NULL;

        obj = i915_gem_object_create_stolen_for_preallocated(i915, base, size);
        if (IS_ERR(obj))
                return NULL;

        /*
         * Mark it WT ahead of time to avoid changing the
         * cache_level during fbdev initialization. The
         * unbind there would get stuck waiting for rcu.
         */
        i915_gem_object_set_cache_coherency(obj, HAS_WT(i915) ?
                                            I915_CACHE_WT : I915_CACHE_NONE);

        switch (plane_config->tiling) {
        case I915_TILING_NONE:
                break;
        case I915_TILING_X:
        case I915_TILING_Y:
                obj->tiling_and_stride =
                        plane_config->fb->base.pitches[0] |
                        plane_config->tiling;
                break;
        default:
                MISSING_CASE(plane_config->tiling);
                goto err_obj;
        }

        vma = i915_vma_instance(obj, &i915->ggtt.vm, NULL);
        if (IS_ERR(vma))
                goto err_obj;

        if (i915_ggtt_pin(vma, NULL, 0, PIN_MAPPABLE | PIN_OFFSET_FIXED | base))
                goto err_obj;

        if (i915_gem_object_is_tiled(obj) &&
            !i915_vma_is_map_and_fenceable(vma))
                goto err_obj;

        return vma;

err_obj:
        i915_gem_object_put(obj);
        return NULL;
}

static bool
intel_alloc_initial_plane_obj(struct intel_crtc *crtc,
                              struct intel_initial_plane_config *plane_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_mode_fb_cmd2 mode_cmd = { 0 };
        struct drm_framebuffer *fb = &plane_config->fb->base;
        struct i915_vma *vma;

        switch (fb->modifier) {
        case DRM_FORMAT_MOD_LINEAR:
        case I915_FORMAT_MOD_X_TILED:
        case I915_FORMAT_MOD_Y_TILED:
                break;
        default:
                drm_dbg(&dev_priv->drm,
                        "Unsupported modifier for initial FB: 0x%llx\n",
                        fb->modifier);
                return false;
        }

        vma = initial_plane_vma(dev_priv, plane_config);
        if (!vma)
                return false;

        mode_cmd.pixel_format = fb->format->format;
        mode_cmd.width = fb->width;
        mode_cmd.height = fb->height;
        mode_cmd.pitches[0] = fb->pitches[0];
        mode_cmd.modifier[0] = fb->modifier;
        mode_cmd.flags = DRM_MODE_FB_MODIFIERS;

        if (intel_framebuffer_init(to_intel_framebuffer(fb),
                                   vma->obj, &mode_cmd)) {
                drm_dbg_kms(&dev_priv->drm, "intel fb init failed\n");
                goto err_vma;
        }

        plane_config->vma = vma;
        return true;

err_vma:
        i915_vma_put(vma);
        return false;
}

static void
intel_set_plane_visible(struct intel_crtc_state *crtc_state,
                        struct intel_plane_state *plane_state,
                        bool visible)
{
        struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);

        plane_state->uapi.visible = visible;

        if (visible)
                crtc_state->uapi.plane_mask |= drm_plane_mask(&plane->base);
        else
                crtc_state->uapi.plane_mask &= ~drm_plane_mask(&plane->base);
}

static void fixup_plane_bitmasks(struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
        struct drm_plane *plane;

        /*
         * Active_planes aliases if multiple "primary" or cursor planes
         * have been used on the same (or wrong) pipe. plane_mask uses
         * unique ids, hence we can use that to reconstruct active_planes.
         */
        crtc_state->enabled_planes = 0;
        crtc_state->active_planes = 0;

        drm_for_each_plane_mask(plane, &dev_priv->drm,
                                crtc_state->uapi.plane_mask) {
                crtc_state->enabled_planes |= BIT(to_intel_plane(plane)->id);
                crtc_state->active_planes |= BIT(to_intel_plane(plane)->id);
        }
}

static void intel_plane_disable_noatomic(struct intel_crtc *crtc,
                                         struct intel_plane *plane)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct intel_crtc_state *crtc_state =
                to_intel_crtc_state(crtc->base.state);
        struct intel_plane_state *plane_state =
                to_intel_plane_state(plane->base.state);

        drm_dbg_kms(&dev_priv->drm,
                    "Disabling [PLANE:%d:%s] on [CRTC:%d:%s]\n",
                    plane->base.base.id, plane->base.name,
                    crtc->base.base.id, crtc->base.name);

        intel_set_plane_visible(crtc_state, plane_state, false);
        fixup_plane_bitmasks(crtc_state);
        crtc_state->data_rate[plane->id] = 0;
        crtc_state->min_cdclk[plane->id] = 0;

        if (plane->id == PLANE_PRIMARY)
                hsw_disable_ips(crtc_state);

        /*
         * Vblank time updates from the shadow to live plane control register
         * are blocked if the memory self-refresh mode is active at that
         * moment. So to make sure the plane gets truly disabled, disable
         * first the self-refresh mode. The self-refresh enable bit in turn
         * will be checked/applied by the HW only at the next frame start
         * event which is after the vblank start event, so we need to have a
         * wait-for-vblank between disabling the plane and the pipe.
         */
        if (HAS_GMCH(dev_priv) &&
            intel_set_memory_cxsr(dev_priv, false))
                intel_wait_for_vblank(dev_priv, crtc->pipe);

        /*
         * Gen2 reports pipe underruns whenever all planes are disabled.
         * So disable underrun reporting before all the planes get disabled.
         */
        if (DISPLAY_VER(dev_priv) == 2 && !crtc_state->active_planes)
                intel_set_cpu_fifo_underrun_reporting(dev_priv, crtc->pipe, false);

        intel_disable_plane(plane, crtc_state);
        intel_wait_for_vblank(dev_priv, crtc->pipe);
}

static bool
intel_reuse_initial_plane_obj(struct drm_i915_private *i915,
                              const struct intel_initial_plane_config *plane_config,
                              struct drm_framebuffer **fb,
                              struct i915_vma **vma)
{
        struct intel_crtc *crtc;

        for_each_intel_crtc(&i915->drm, crtc) {
                struct intel_crtc_state *crtc_state =
                        to_intel_crtc_state(crtc->base.state);
                struct intel_plane *plane =
                        to_intel_plane(crtc->base.primary);
                struct intel_plane_state *plane_state =
                        to_intel_plane_state(plane->base.state);

                if (!crtc_state->uapi.active)
                        continue;

                if (!plane_state->ggtt_vma)
                        continue;

                if (intel_plane_ggtt_offset(plane_state) == plane_config->base) {
                        *fb = plane_state->hw.fb;
                        *vma = plane_state->ggtt_vma;
                        return true;
                }
        }

        return false;
}

static void
intel_find_initial_plane_obj(struct intel_crtc *crtc,
                             struct intel_initial_plane_config *plane_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_crtc_state *crtc_state =
                to_intel_crtc_state(crtc->base.state);
        struct intel_plane *plane =
                to_intel_plane(crtc->base.primary);
        struct intel_plane_state *plane_state =
                to_intel_plane_state(plane->base.state);
        struct drm_framebuffer *fb;
        struct i915_vma *vma;

        /*
         * TODO:
         *   Disable planes if get_initial_plane_config() failed.
         *   Make sure things work if the surface base is not page aligned.
         */
        if (!plane_config->fb)
                return;

        if (intel_alloc_initial_plane_obj(crtc, plane_config)) {
                fb = &plane_config->fb->base;
                vma = plane_config->vma;
                goto valid_fb;
        }

        /*
         * Failed to alloc the obj, check to see if we should share
         * an fb with another CRTC instead
         */
        if (intel_reuse_initial_plane_obj(dev_priv, plane_config, &fb, &vma))
                goto valid_fb;

        /*
         * We've failed to reconstruct the BIOS FB.  Current display state
         * indicates that the primary plane is visible, but has a NULL FB,
         * which will lead to problems later if we don't fix it up.  The
         * simplest solution is to just disable the primary plane now and
         * pretend the BIOS never had it enabled.
         */
        intel_plane_disable_noatomic(crtc, plane);
        if (crtc_state->bigjoiner) {
                struct intel_crtc *slave =
                        crtc_state->bigjoiner_linked_crtc;
                intel_plane_disable_noatomic(slave, to_intel_plane(slave->base.primary));
        }

        return;

valid_fb:
        plane_state->uapi.rotation = plane_config->rotation;
        intel_fb_fill_view(to_intel_framebuffer(fb),
                           plane_state->uapi.rotation, &plane_state->view);

        __i915_vma_pin(vma);
        plane_state->ggtt_vma = i915_vma_get(vma);
        if (intel_plane_uses_fence(plane_state) &&
            i915_vma_pin_fence(vma) == 0 && vma->fence)
                plane_state->flags |= PLANE_HAS_FENCE;

        plane_state->uapi.src_x = 0;
        plane_state->uapi.src_y = 0;
        plane_state->uapi.src_w = fb->width << 16;
        plane_state->uapi.src_h = fb->height << 16;

        plane_state->uapi.crtc_x = 0;
        plane_state->uapi.crtc_y = 0;
        plane_state->uapi.crtc_w = fb->width;
        plane_state->uapi.crtc_h = fb->height;

        if (plane_config->tiling)
                dev_priv->preserve_bios_swizzle = true;

        plane_state->uapi.fb = fb;
        drm_framebuffer_get(fb);

        plane_state->uapi.crtc = &crtc->base;
        intel_plane_copy_uapi_to_hw_state(plane_state, plane_state, crtc);

        intel_frontbuffer_flush(to_intel_frontbuffer(fb), ORIGIN_DIRTYFB);

        atomic_or(plane->frontbuffer_bit, &to_intel_frontbuffer(fb)->bits);
}

unsigned int
intel_plane_fence_y_offset(const struct intel_plane_state *plane_state)
{
        int x = 0, y = 0;

        intel_plane_adjust_aligned_offset(&x, &y, plane_state, 0,
                                          plane_state->view.color_plane[0].offset, 0);

        return y;
}

static int
__intel_display_resume(struct drm_device *dev,
                       struct drm_atomic_state *state,
                       struct drm_modeset_acquire_ctx *ctx)
{
        struct drm_crtc_state *crtc_state;
        struct drm_crtc *crtc;
        int i, ret;

        intel_modeset_setup_hw_state(dev, ctx);
        intel_vga_redisable(to_i915(dev));

        if (!state)
                return 0;

        /*
         * We've duplicated the state, pointers to the old state are invalid.
         *
         * Don't attempt to use the old state until we commit the duplicated state.
         */
        for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
                /*
                 * Force recalculation even if we restore
                 * current state. With fast modeset this may not result
                 * in a modeset when the state is compatible.
                 */
                crtc_state->mode_changed = true;
        }

        /* ignore any reset values/BIOS leftovers in the WM registers */
        if (!HAS_GMCH(to_i915(dev)))
                to_intel_atomic_state(state)->skip_intermediate_wm = true;

        ret = drm_atomic_helper_commit_duplicated_state(state, ctx);

        drm_WARN_ON(dev, ret == -EDEADLK);
        return ret;
}

static bool gpu_reset_clobbers_display(struct drm_i915_private *dev_priv)
{
        return (INTEL_INFO(dev_priv)->gpu_reset_clobbers_display &&
                intel_has_gpu_reset(&dev_priv->gt));
}

void intel_display_prepare_reset(struct drm_i915_private *dev_priv)
{
        struct drm_device *dev = &dev_priv->drm;
        struct drm_modeset_acquire_ctx *ctx = &dev_priv->reset_ctx;
        struct drm_atomic_state *state;
        int ret;

        if (!HAS_DISPLAY(dev_priv))
                return;

        /* reset doesn't touch the display */
        if (!dev_priv->params.force_reset_modeset_test &&
            !gpu_reset_clobbers_display(dev_priv))
                return;

        /* We have a modeset vs reset deadlock, defensively unbreak it. */
        set_bit(I915_RESET_MODESET, &dev_priv->gt.reset.flags);
        smp_mb__after_atomic();
        wake_up_bit(&dev_priv->gt.reset.flags, I915_RESET_MODESET);

        if (atomic_read(&dev_priv->gpu_error.pending_fb_pin)) {
                drm_dbg_kms(&dev_priv->drm,
                            "Modeset potentially stuck, unbreaking through wedging\n");
                intel_gt_set_wedged(&dev_priv->gt);
        }

        /*
         * Need mode_config.mutex so that we don't
         * trample ongoing ->detect() and whatnot.
         */
        mutex_lock(&dev->mode_config.mutex);
        drm_modeset_acquire_init(ctx, 0);
        while (1) {
                ret = drm_modeset_lock_all_ctx(dev, ctx);
                if (ret != -EDEADLK)
                        break;

                drm_modeset_backoff(ctx);
        }
        /*
         * Disabling the crtcs gracefully seems nicer. Also the
         * g33 docs say we should at least disable all the planes.
         */
        state = drm_atomic_helper_duplicate_state(dev, ctx);
        if (IS_ERR(state)) {
                ret = PTR_ERR(state);
                drm_err(&dev_priv->drm, "Duplicating state failed with %i\n",
                        ret);
                return;
        }

        ret = drm_atomic_helper_disable_all(dev, ctx);
        if (ret) {
                drm_err(&dev_priv->drm, "Suspending crtc's failed with %i\n",
                        ret);
                drm_atomic_state_put(state);
                return;
        }

        dev_priv->modeset_restore_state = state;
        state->acquire_ctx = ctx;
}

void intel_display_finish_reset(struct drm_i915_private *dev_priv)
{
        struct drm_device *dev = &dev_priv->drm;
        struct drm_modeset_acquire_ctx *ctx = &dev_priv->reset_ctx;
        struct drm_atomic_state *state;
        int ret;

        if (!HAS_DISPLAY(dev_priv))
                return;

        /* reset doesn't touch the display */
        if (!test_bit(I915_RESET_MODESET, &dev_priv->gt.reset.flags))
                return;

        state = fetch_and_zero(&dev_priv->modeset_restore_state);
        if (!state)
                goto unlock;

        /* reset doesn't touch the display */
        if (!gpu_reset_clobbers_display(dev_priv)) {
                /* for testing only restore the display */
                ret = __intel_display_resume(dev, state, ctx);
                if (ret)
                        drm_err(&dev_priv->drm,
                                "Restoring old state failed with %i\n", ret);
        } else {
                /*
                 * The display has been reset as well,
                 * so need a full re-initialization.
                 */
                intel_pps_unlock_regs_wa(dev_priv);
                intel_modeset_init_hw(dev_priv);
                intel_init_clock_gating(dev_priv);
                intel_hpd_init(dev_priv);

                ret = __intel_display_resume(dev, state, ctx);
                if (ret)
                        drm_err(&dev_priv->drm,
                                "Restoring old state failed with %i\n", ret);

                intel_hpd_poll_disable(dev_priv);
        }

        drm_atomic_state_put(state);
unlock:
        drm_modeset_drop_locks(ctx);
        drm_modeset_acquire_fini(ctx);
        mutex_unlock(&dev->mode_config.mutex);

        clear_bit_unlock(I915_RESET_MODESET, &dev_priv->gt.reset.flags);
}

static bool underrun_recovery_supported(const struct intel_crtc_state *crtc_state)
{
        if (crtc_state->pch_pfit.enabled &&
            (crtc_state->pipe_src_w > drm_rect_width(&crtc_state->pch_pfit.dst) ||
             crtc_state->pipe_src_h > drm_rect_height(&crtc_state->pch_pfit.dst) ||
             crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420))
                return false;

        if (crtc_state->dsc.compression_enable)
                return false;

        if (crtc_state->has_psr2)
                return false;

        if (crtc_state->splitter.enable)
                return false;

        return true;
}

static void icl_set_pipe_chicken(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;
        u32 tmp;

        tmp = intel_de_read(dev_priv, PIPE_CHICKEN(pipe));

        /*
         * Display WA #1153: icl
         * enable hardware to bypass the alpha math
         * and rounding for per-pixel values 00 and 0xff
         */
        tmp |= PER_PIXEL_ALPHA_BYPASS_EN;
        /*
         * Display WA # 1605353570: icl
         * Set the pixel rounding bit to 1 for allowing
         * passthrough of Frame buffer pixels unmodified
         * across pipe
         */
        tmp |= PIXEL_ROUNDING_TRUNC_FB_PASSTHRU;

        if (IS_DG2(dev_priv)) {
                /*
                 * Underrun recovery must always be disabled on DG2.  However
                 * the chicken bit meaning is inverted compared to other
                 * platforms.
                 */
                tmp &= ~UNDERRUN_RECOVERY_ENABLE_DG2;
        } else if (DISPLAY_VER(dev_priv) >= 13) {
                if (underrun_recovery_supported(crtc_state))
                        tmp &= ~UNDERRUN_RECOVERY_DISABLE_ADLP;
                else
                        tmp |= UNDERRUN_RECOVERY_DISABLE_ADLP;
        }

        intel_de_write(dev_priv, PIPE_CHICKEN(pipe), tmp);
}

bool intel_has_pending_fb_unpin(struct drm_i915_private *dev_priv)
{
        struct drm_crtc *crtc;
        bool cleanup_done;

        drm_for_each_crtc(crtc, &dev_priv->drm) {
                struct drm_crtc_commit *commit;
                spin_lock(&crtc->commit_lock);
                commit = list_first_entry_or_null(&crtc->commit_list,
                                                  struct drm_crtc_commit, commit_entry);
                cleanup_done = commit ?
                        try_wait_for_completion(&commit->cleanup_done) : true;
                spin_unlock(&crtc->commit_lock);

                if (cleanup_done)
                        continue;

                drm_crtc_wait_one_vblank(crtc);

                return true;
        }

        return false;
}

void lpt_disable_iclkip(struct drm_i915_private *dev_priv)
{
        u32 temp;

        intel_de_write(dev_priv, PIXCLK_GATE, PIXCLK_GATE_GATE);

        mutex_lock(&dev_priv->sb_lock);

        temp = intel_sbi_read(dev_priv, SBI_SSCCTL6, SBI_ICLK);
        temp |= SBI_SSCCTL_DISABLE;
        intel_sbi_write(dev_priv, SBI_SSCCTL6, temp, SBI_ICLK);

        mutex_unlock(&dev_priv->sb_lock);
}

/* Program iCLKIP clock to the desired frequency */
static void lpt_program_iclkip(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        int clock = crtc_state->hw.adjusted_mode.crtc_clock;
        u32 divsel, phaseinc, auxdiv, phasedir = 0;
        u32 temp;

        lpt_disable_iclkip(dev_priv);

        /* The iCLK virtual clock root frequency is in MHz,
         * but the adjusted_mode->crtc_clock in in KHz. To get the
         * divisors, it is necessary to divide one by another, so we
         * convert the virtual clock precision to KHz here for higher
         * precision.
         */
        for (auxdiv = 0; auxdiv < 2; auxdiv++) {
                u32 iclk_virtual_root_freq = 172800 * 1000;
                u32 iclk_pi_range = 64;
                u32 desired_divisor;

                desired_divisor = DIV_ROUND_CLOSEST(iclk_virtual_root_freq,
                                                    clock << auxdiv);
                divsel = (desired_divisor / iclk_pi_range) - 2;
                phaseinc = desired_divisor % iclk_pi_range;

                /*
                 * Near 20MHz is a corner case which is
                 * out of range for the 7-bit divisor
                 */
                if (divsel <= 0x7f)
                        break;
        }

        /* This should not happen with any sane values */
        drm_WARN_ON(&dev_priv->drm, SBI_SSCDIVINTPHASE_DIVSEL(divsel) &
                    ~SBI_SSCDIVINTPHASE_DIVSEL_MASK);
        drm_WARN_ON(&dev_priv->drm, SBI_SSCDIVINTPHASE_DIR(phasedir) &
                    ~SBI_SSCDIVINTPHASE_INCVAL_MASK);

        drm_dbg_kms(&dev_priv->drm,
                    "iCLKIP clock: found settings for %dKHz refresh rate: auxdiv=%x, divsel=%x, phasedir=%x, phaseinc=%x\n",
                    clock, auxdiv, divsel, phasedir, phaseinc);

        mutex_lock(&dev_priv->sb_lock);

        /* Program SSCDIVINTPHASE6 */
        temp = intel_sbi_read(dev_priv, SBI_SSCDIVINTPHASE6, SBI_ICLK);
        temp &= ~SBI_SSCDIVINTPHASE_DIVSEL_MASK;
        temp |= SBI_SSCDIVINTPHASE_DIVSEL(divsel);
        temp &= ~SBI_SSCDIVINTPHASE_INCVAL_MASK;
        temp |= SBI_SSCDIVINTPHASE_INCVAL(phaseinc);
        temp |= SBI_SSCDIVINTPHASE_DIR(phasedir);
        temp |= SBI_SSCDIVINTPHASE_PROPAGATE;
        intel_sbi_write(dev_priv, SBI_SSCDIVINTPHASE6, temp, SBI_ICLK);

        /* Program SSCAUXDIV */
        temp = intel_sbi_read(dev_priv, SBI_SSCAUXDIV6, SBI_ICLK);
        temp &= ~SBI_SSCAUXDIV_FINALDIV2SEL(1);
        temp |= SBI_SSCAUXDIV_FINALDIV2SEL(auxdiv);
        intel_sbi_write(dev_priv, SBI_SSCAUXDIV6, temp, SBI_ICLK);

        /* Enable modulator and associated divider */
        temp = intel_sbi_read(dev_priv, SBI_SSCCTL6, SBI_ICLK);
        temp &= ~SBI_SSCCTL_DISABLE;
        intel_sbi_write(dev_priv, SBI_SSCCTL6, temp, SBI_ICLK);

        mutex_unlock(&dev_priv->sb_lock);

        /* Wait for initialization time */
        udelay(24);

        intel_de_write(dev_priv, PIXCLK_GATE, PIXCLK_GATE_UNGATE);
}

int lpt_get_iclkip(struct drm_i915_private *dev_priv)
{
        u32 divsel, phaseinc, auxdiv;
        u32 iclk_virtual_root_freq = 172800 * 1000;
        u32 iclk_pi_range = 64;
        u32 desired_divisor;
        u32 temp;

        if ((intel_de_read(dev_priv, PIXCLK_GATE) & PIXCLK_GATE_UNGATE) == 0)
                return 0;

        mutex_lock(&dev_priv->sb_lock);

        temp = intel_sbi_read(dev_priv, SBI_SSCCTL6, SBI_ICLK);
        if (temp & SBI_SSCCTL_DISABLE) {
                mutex_unlock(&dev_priv->sb_lock);
                return 0;
        }

        temp = intel_sbi_read(dev_priv, SBI_SSCDIVINTPHASE6, SBI_ICLK);
        divsel = (temp & SBI_SSCDIVINTPHASE_DIVSEL_MASK) >>
                SBI_SSCDIVINTPHASE_DIVSEL_SHIFT;
        phaseinc = (temp & SBI_SSCDIVINTPHASE_INCVAL_MASK) >>
                SBI_SSCDIVINTPHASE_INCVAL_SHIFT;

        temp = intel_sbi_read(dev_priv, SBI_SSCAUXDIV6, SBI_ICLK);
        auxdiv = (temp & SBI_SSCAUXDIV_FINALDIV2SEL_MASK) >>
                SBI_SSCAUXDIV_FINALDIV2SEL_SHIFT;

        mutex_unlock(&dev_priv->sb_lock);

        desired_divisor = (divsel + 2) * iclk_pi_range + phaseinc;

        return DIV_ROUND_CLOSEST(iclk_virtual_root_freq,
                                 desired_divisor << auxdiv);
}

static void ilk_pch_transcoder_set_timings(const struct intel_crtc_state *crtc_state,
                                           enum pipe pch_transcoder)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;

        intel_de_write(dev_priv, PCH_TRANS_HTOTAL(pch_transcoder),
                       intel_de_read(dev_priv, HTOTAL(cpu_transcoder)));
        intel_de_write(dev_priv, PCH_TRANS_HBLANK(pch_transcoder),
                       intel_de_read(dev_priv, HBLANK(cpu_transcoder)));
        intel_de_write(dev_priv, PCH_TRANS_HSYNC(pch_transcoder),
                       intel_de_read(dev_priv, HSYNC(cpu_transcoder)));

        intel_de_write(dev_priv, PCH_TRANS_VTOTAL(pch_transcoder),
                       intel_de_read(dev_priv, VTOTAL(cpu_transcoder)));
        intel_de_write(dev_priv, PCH_TRANS_VBLANK(pch_transcoder),
                       intel_de_read(dev_priv, VBLANK(cpu_transcoder)));
        intel_de_write(dev_priv, PCH_TRANS_VSYNC(pch_transcoder),
                       intel_de_read(dev_priv, VSYNC(cpu_transcoder)));
        intel_de_write(dev_priv, PCH_TRANS_VSYNCSHIFT(pch_transcoder),
                       intel_de_read(dev_priv, VSYNCSHIFT(cpu_transcoder)));
}

static void cpt_set_fdi_bc_bifurcation(struct drm_i915_private *dev_priv, bool enable)
{
        u32 temp;

        temp = intel_de_read(dev_priv, SOUTH_CHICKEN1);
        if (!!(temp & FDI_BC_BIFURCATION_SELECT) == enable)
                return;

        drm_WARN_ON(&dev_priv->drm,
                    intel_de_read(dev_priv, FDI_RX_CTL(PIPE_B)) &
                    FDI_RX_ENABLE);
        drm_WARN_ON(&dev_priv->drm,
                    intel_de_read(dev_priv, FDI_RX_CTL(PIPE_C)) &
                    FDI_RX_ENABLE);

        temp &= ~FDI_BC_BIFURCATION_SELECT;
        if (enable)
                temp |= FDI_BC_BIFURCATION_SELECT;

        drm_dbg_kms(&dev_priv->drm, "%sabling fdi C rx\n",
                    enable ? "en" : "dis");
        intel_de_write(dev_priv, SOUTH_CHICKEN1, temp);
        intel_de_posting_read(dev_priv, SOUTH_CHICKEN1);
}

static void ivb_update_fdi_bc_bifurcation(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        switch (crtc->pipe) {
        case PIPE_A:
                break;
        case PIPE_B:
                if (crtc_state->fdi_lanes > 2)
                        cpt_set_fdi_bc_bifurcation(dev_priv, false);
                else
                        cpt_set_fdi_bc_bifurcation(dev_priv, true);

                break;
        case PIPE_C:
                cpt_set_fdi_bc_bifurcation(dev_priv, true);

                break;
        default:
                BUG();
        }
}

/*
 * Finds the encoder associated with the given CRTC. This can only be
 * used when we know that the CRTC isn't feeding multiple encoders!
 */
struct intel_encoder *
intel_get_crtc_new_encoder(const struct intel_atomic_state *state,
                           const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        const struct drm_connector_state *connector_state;
        const struct drm_connector *connector;
        struct intel_encoder *encoder = NULL;
        int num_encoders = 0;
        int i;

        for_each_new_connector_in_state(&state->base, connector, connector_state, i) {
                if (connector_state->crtc != &crtc->base)
                        continue;

                encoder = to_intel_encoder(connector_state->best_encoder);
                num_encoders++;
        }

        drm_WARN(encoder->base.dev, num_encoders != 1,
                 "%d encoders for pipe %c\n",
                 num_encoders, pipe_name(crtc->pipe));

        return encoder;
}

/*
 * Enable PCH resources required for PCH ports:
 *   - PCH PLLs
 *   - FDI training & RX/TX
 *   - update transcoder timings
 *   - DP transcoding bits
 *   - transcoder
 */
static void ilk_pch_enable(const struct intel_atomic_state *state,
                           const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum pipe pipe = crtc->pipe;
        u32 temp;

        assert_pch_transcoder_disabled(dev_priv, pipe);

        if (IS_IVYBRIDGE(dev_priv))
                ivb_update_fdi_bc_bifurcation(crtc_state);

        /* Write the TU size bits before fdi link training, so that error
         * detection works. */
        intel_de_write(dev_priv, FDI_RX_TUSIZE1(pipe),
                       intel_de_read(dev_priv, PIPE_DATA_M1(pipe)) & TU_SIZE_MASK);

        /* For PCH output, training FDI link */
        dev_priv->display.fdi_link_train(crtc, crtc_state);

        /* We need to program the right clock selection before writing the pixel
         * mutliplier into the DPLL. */
        if (HAS_PCH_CPT(dev_priv)) {
                u32 sel;

                temp = intel_de_read(dev_priv, PCH_DPLL_SEL);
                temp |= TRANS_DPLL_ENABLE(pipe);
                sel = TRANS_DPLLB_SEL(pipe);
                if (crtc_state->shared_dpll ==
                    intel_get_shared_dpll_by_id(dev_priv, DPLL_ID_PCH_PLL_B))
                        temp |= sel;
                else
                        temp &= ~sel;
                intel_de_write(dev_priv, PCH_DPLL_SEL, temp);
        }

        /* XXX: pch pll's can be enabled any time before we enable the PCH
         * transcoder, and we actually should do this to not upset any PCH
         * transcoder that already use the clock when we share it.
         *
         * Note that enable_shared_dpll tries to do the right thing, but
         * get_shared_dpll unconditionally resets the pll - we need that to have
         * the right LVDS enable sequence. */
        intel_enable_shared_dpll(crtc_state);

        /* set transcoder timing, panel must allow it */
        assert_panel_unlocked(dev_priv, pipe);
        ilk_pch_transcoder_set_timings(crtc_state, pipe);

        intel_fdi_normal_train(crtc);

        /* For PCH DP, enable TRANS_DP_CTL */
        if (HAS_PCH_CPT(dev_priv) &&
            intel_crtc_has_dp_encoder(crtc_state)) {
                const struct drm_display_mode *adjusted_mode =
                        &crtc_state->hw.adjusted_mode;
                u32 bpc = (intel_de_read(dev_priv, PIPECONF(pipe)) & PIPECONF_BPC_MASK) >> 5;
                i915_reg_t reg = TRANS_DP_CTL(pipe);
                enum port port;

                temp = intel_de_read(dev_priv, reg);
                temp &= ~(TRANS_DP_PORT_SEL_MASK |
                          TRANS_DP_SYNC_MASK |
                          TRANS_DP_BPC_MASK);
                temp |= TRANS_DP_OUTPUT_ENABLE;
                temp |= bpc << 9; /* same format but at 11:9 */

                if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
                        temp |= TRANS_DP_HSYNC_ACTIVE_HIGH;
                if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
                        temp |= TRANS_DP_VSYNC_ACTIVE_HIGH;

                port = intel_get_crtc_new_encoder(state, crtc_state)->port;
                drm_WARN_ON(dev, port < PORT_B || port > PORT_D);
                temp |= TRANS_DP_PORT_SEL(port);

                intel_de_write(dev_priv, reg, temp);
        }

        ilk_enable_pch_transcoder(crtc_state);
}

void lpt_pch_enable(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;

        assert_pch_transcoder_disabled(dev_priv, PIPE_A);

        lpt_program_iclkip(crtc_state);

        /* Set transcoder timing. */
        ilk_pch_transcoder_set_timings(crtc_state, PIPE_A);

        lpt_enable_pch_transcoder(dev_priv, cpu_transcoder);
}

static void cpt_verify_modeset(struct drm_i915_private *dev_priv,
                               enum pipe pipe)
{
        i915_reg_t dslreg = PIPEDSL(pipe);
        u32 temp;

        temp = intel_de_read(dev_priv, dslreg);
        udelay(500);
        if (wait_for(intel_de_read(dev_priv, dslreg) != temp, 5)) {
                if (wait_for(intel_de_read(dev_priv, dslreg) != temp, 5))
                        drm_err(&dev_priv->drm,
                                "mode set failed: pipe %c stuck\n",
                                pipe_name(pipe));
        }
}

static void ilk_pfit_enable(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        const struct drm_rect *dst = &crtc_state->pch_pfit.dst;
        enum pipe pipe = crtc->pipe;
        int width = drm_rect_width(dst);
        int height = drm_rect_height(dst);
        int x = dst->x1;
        int y = dst->y1;

        if (!crtc_state->pch_pfit.enabled)
                return;

        /* Force use of hard-coded filter coefficients
         * as some pre-programmed values are broken,
         * e.g. x201.
         */
        if (IS_IVYBRIDGE(dev_priv) || IS_HASWELL(dev_priv))
                intel_de_write(dev_priv, PF_CTL(pipe), PF_ENABLE |
                               PF_FILTER_MED_3x3 | PF_PIPE_SEL_IVB(pipe));
        else
                intel_de_write(dev_priv, PF_CTL(pipe), PF_ENABLE |
                               PF_FILTER_MED_3x3);
        intel_de_write(dev_priv, PF_WIN_POS(pipe), x << 16 | y);
        intel_de_write(dev_priv, PF_WIN_SZ(pipe), width << 16 | height);
}

void hsw_enable_ips(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);

        if (!crtc_state->ips_enabled)
                return;

        /*
         * We can only enable IPS after we enable a plane and wait for a vblank
         * This function is called from post_plane_update, which is run after
         * a vblank wait.
         */
        drm_WARN_ON(dev, !(crtc_state->active_planes & ~BIT(PLANE_CURSOR)));

        if (IS_BROADWELL(dev_priv)) {
                drm_WARN_ON(dev, sandybridge_pcode_write(dev_priv, DISPLAY_IPS_CONTROL,
                                                         IPS_ENABLE | IPS_PCODE_CONTROL));
                /* Quoting Art Runyan: "its not safe to expect any particular
                 * value in IPS_CTL bit 31 after enabling IPS through the
                 * mailbox." Moreover, the mailbox may return a bogus state,
                 * so we need to just enable it and continue on.
                 */
        } else {
                intel_de_write(dev_priv, IPS_CTL, IPS_ENABLE);
                /* The bit only becomes 1 in the next vblank, so this wait here
                 * is essentially intel_wait_for_vblank. If we don't have this
                 * and don't wait for vblanks until the end of crtc_enable, then
                 * the HW state readout code will complain that the expected
                 * IPS_CTL value is not the one we read. */
                if (intel_de_wait_for_set(dev_priv, IPS_CTL, IPS_ENABLE, 50))
                        drm_err(&dev_priv->drm,
                                "Timed out waiting for IPS enable\n");
        }
}

void hsw_disable_ips(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);

        if (!crtc_state->ips_enabled)
                return;

        if (IS_BROADWELL(dev_priv)) {
                drm_WARN_ON(dev,
                            sandybridge_pcode_write(dev_priv, DISPLAY_IPS_CONTROL, 0));
                /*
                 * Wait for PCODE to finish disabling IPS. The BSpec specified
                 * 42ms timeout value leads to occasional timeouts so use 100ms
                 * instead.
                 */
                if (intel_de_wait_for_clear(dev_priv, IPS_CTL, IPS_ENABLE, 100))
                        drm_err(&dev_priv->drm,
                                "Timed out waiting for IPS disable\n");
        } else {
                intel_de_write(dev_priv, IPS_CTL, 0);
                intel_de_posting_read(dev_priv, IPS_CTL);
        }

        /* We need to wait for a vblank before we can disable the plane. */
        intel_wait_for_vblank(dev_priv, crtc->pipe);
}

static void intel_crtc_dpms_overlay_disable(struct intel_crtc *crtc)
{
        if (crtc->overlay)
                (void) intel_overlay_switch_off(crtc->overlay);

        /* Let userspace switch the overlay on again. In most cases userspace
         * has to recompute where to put it anyway.
         */
}

static bool hsw_pre_update_disable_ips(const struct intel_crtc_state *old_crtc_state,
                                       const struct intel_crtc_state *new_crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(new_crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        if (!old_crtc_state->ips_enabled)
                return false;

        if (intel_crtc_needs_modeset(new_crtc_state))
                return true;

        /*
         * Workaround : Do not read or write the pipe palette/gamma data while
         * GAMMA_MODE is configured for split gamma and IPS_CTL has IPS enabled.
         *
         * Disable IPS before we program the LUT.
         */
        if (IS_HASWELL(dev_priv) &&
            (new_crtc_state->uapi.color_mgmt_changed ||
             new_crtc_state->update_pipe) &&
            new_crtc_state->gamma_mode == GAMMA_MODE_MODE_SPLIT)
                return true;

        return !new_crtc_state->ips_enabled;
}

static bool hsw_post_update_enable_ips(const struct intel_crtc_state *old_crtc_state,
                                       const struct intel_crtc_state *new_crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(new_crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        if (!new_crtc_state->ips_enabled)
                return false;

        if (intel_crtc_needs_modeset(new_crtc_state))
                return true;

        /*
         * Workaround : Do not read or write the pipe palette/gamma data while
         * GAMMA_MODE is configured for split gamma and IPS_CTL has IPS enabled.
         *
         * Re-enable IPS after the LUT has been programmed.
         */
        if (IS_HASWELL(dev_priv) &&
            (new_crtc_state->uapi.color_mgmt_changed ||
             new_crtc_state->update_pipe) &&
            new_crtc_state->gamma_mode == GAMMA_MODE_MODE_SPLIT)
                return true;

        /*
         * We can't read out IPS on broadwell, assume the worst and
         * forcibly enable IPS on the first fastset.
         */
        if (new_crtc_state->update_pipe && old_crtc_state->inherited)
                return true;

        return !old_crtc_state->ips_enabled;
}

static bool needs_nv12_wa(const struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);

        if (!crtc_state->nv12_planes)
                return false;

        /* WA Display #0827: Gen9:all */
        if (DISPLAY_VER(dev_priv) == 9)
                return true;

        return false;
}

static bool needs_scalerclk_wa(const struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);

        /* Wa_2006604312:icl,ehl */
        if (crtc_state->scaler_state.scaler_users > 0 && DISPLAY_VER(dev_priv) == 11)
                return true;

        return false;
}

static bool planes_enabling(const struct intel_crtc_state *old_crtc_state,
                            const struct intel_crtc_state *new_crtc_state)
{
        return (!old_crtc_state->active_planes || intel_crtc_needs_modeset(new_crtc_state)) &&
                new_crtc_state->active_planes;
}

static bool planes_disabling(const struct intel_crtc_state *old_crtc_state,
                             const struct intel_crtc_state *new_crtc_state)
{
        return old_crtc_state->active_planes &&
                (!new_crtc_state->active_planes || intel_crtc_needs_modeset(new_crtc_state));
}

static void intel_post_plane_update(struct intel_atomic_state *state,
                                    struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);
        const struct intel_crtc_state *old_crtc_state =
                intel_atomic_get_old_crtc_state(state, crtc);
        const struct intel_crtc_state *new_crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        enum pipe pipe = crtc->pipe;

        intel_frontbuffer_flip(dev_priv, new_crtc_state->fb_bits);

        if (new_crtc_state->update_wm_post && new_crtc_state->hw.active)
                intel_update_watermarks(crtc);

        if (hsw_post_update_enable_ips(old_crtc_state, new_crtc_state))
                hsw_enable_ips(new_crtc_state);

        intel_fbc_post_update(state, crtc);

        if (needs_nv12_wa(old_crtc_state) &&
            !needs_nv12_wa(new_crtc_state))
                skl_wa_827(dev_priv, pipe, false);

        if (needs_scalerclk_wa(old_crtc_state) &&
            !needs_scalerclk_wa(new_crtc_state))
                icl_wa_scalerclkgating(dev_priv, pipe, false);
}

static void intel_crtc_enable_flip_done(struct intel_atomic_state *state,
                                        struct intel_crtc *crtc)
{
        const struct intel_crtc_state *crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        u8 update_planes = crtc_state->update_planes;
        const struct intel_plane_state *plane_state;
        struct intel_plane *plane;
        int i;

        for_each_new_intel_plane_in_state(state, plane, plane_state, i) {
                if (plane->enable_flip_done &&
                    plane->pipe == crtc->pipe &&
                    update_planes & BIT(plane->id))
                        plane->enable_flip_done(plane);
        }
}

static void intel_crtc_disable_flip_done(struct intel_atomic_state *state,
                                         struct intel_crtc *crtc)
{
        const struct intel_crtc_state *crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        u8 update_planes = crtc_state->update_planes;
        const struct intel_plane_state *plane_state;
        struct intel_plane *plane;
        int i;

        for_each_new_intel_plane_in_state(state, plane, plane_state, i) {
                if (plane->disable_flip_done &&
                    plane->pipe == crtc->pipe &&
                    update_planes & BIT(plane->id))
                        plane->disable_flip_done(plane);
        }
}

static void intel_crtc_async_flip_disable_wa(struct intel_atomic_state *state,
                                             struct intel_crtc *crtc)
{
        struct drm_i915_private *i915 = to_i915(state->base.dev);
        const struct intel_crtc_state *old_crtc_state =
                intel_atomic_get_old_crtc_state(state, crtc);
        const struct intel_crtc_state *new_crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        u8 update_planes = new_crtc_state->update_planes;
        const struct intel_plane_state *old_plane_state;
        struct intel_plane *plane;
        bool need_vbl_wait = false;
        int i;

        for_each_old_intel_plane_in_state(state, plane, old_plane_state, i) {
                if (plane->need_async_flip_disable_wa &&
                    plane->pipe == crtc->pipe &&
                    update_planes & BIT(plane->id)) {
                        /*
                         * Apart from the async flip bit we want to
                         * preserve the old state for the plane.
                         */
                        plane->async_flip(plane, old_crtc_state,
                                          old_plane_state, false);
                        need_vbl_wait = true;
                }
        }

        if (need_vbl_wait)
                intel_wait_for_vblank(i915, crtc->pipe);
}

static void intel_pre_plane_update(struct intel_atomic_state *state,
                                   struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);
        const struct intel_crtc_state *old_crtc_state =
                intel_atomic_get_old_crtc_state(state, crtc);
        const struct intel_crtc_state *new_crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        enum pipe pipe = crtc->pipe;

        if (hsw_pre_update_disable_ips(old_crtc_state, new_crtc_state))
                hsw_disable_ips(old_crtc_state);

        if (intel_fbc_pre_update(state, crtc))
                intel_wait_for_vblank(dev_priv, pipe);

        /* Display WA 827 */
        if (!needs_nv12_wa(old_crtc_state) &&
            needs_nv12_wa(new_crtc_state))
                skl_wa_827(dev_priv, pipe, true);

        /* Wa_2006604312:icl,ehl */
        if (!needs_scalerclk_wa(old_crtc_state) &&
            needs_scalerclk_wa(new_crtc_state))
                icl_wa_scalerclkgating(dev_priv, pipe, true);

        /*
         * Vblank time updates from the shadow to live plane control register
         * are blocked if the memory self-refresh mode is active at that
         * moment. So to make sure the plane gets truly disabled, disable
         * first the self-refresh mode. The self-refresh enable bit in turn
         * will be checked/applied by the HW only at the next frame start
         * event which is after the vblank start event, so we need to have a
         * wait-for-vblank between disabling the plane and the pipe.
         */
        if (HAS_GMCH(dev_priv) && old_crtc_state->hw.active &&
            new_crtc_state->disable_cxsr && intel_set_memory_cxsr(dev_priv, false))
                intel_wait_for_vblank(dev_priv, pipe);

        /*
         * IVB workaround: must disable low power watermarks for at least
         * one frame before enabling scaling.  LP watermarks can be re-enabled
         * when scaling is disabled.
         *
         * WaCxSRDisabledForSpriteScaling:ivb
         */
        if (old_crtc_state->hw.active &&
            new_crtc_state->disable_lp_wm && ilk_disable_lp_wm(dev_priv))
                intel_wait_for_vblank(dev_priv, pipe);

        /*
         * If we're doing a modeset we don't need to do any
         * pre-vblank watermark programming here.
         */
        if (!intel_crtc_needs_modeset(new_crtc_state)) {
                /*
                 * For platforms that support atomic watermarks, program the
                 * 'intermediate' watermarks immediately.  On pre-gen9 platforms, these
                 * will be the intermediate values that are safe for both pre- and
                 * post- vblank; when vblank happens, the 'active' values will be set
                 * to the final 'target' values and we'll do this again to get the
                 * optimal watermarks.  For gen9+ platforms, the values we program here
                 * will be the final target values which will get automatically latched
                 * at vblank time; no further programming will be necessary.
                 *
                 * If a platform hasn't been transitioned to atomic watermarks yet,
                 * we'll continue to update watermarks the old way, if flags tell
                 * us to.
                 */
                if (dev_priv->display.initial_watermarks)
                        dev_priv->display.initial_watermarks(state, crtc);
                else if (new_crtc_state->update_wm_pre)
                        intel_update_watermarks(crtc);
        }

        /*
         * Gen2 reports pipe underruns whenever all planes are disabled.
         * So disable underrun reporting before all the planes get disabled.
         *
         * We do this after .initial_watermarks() so that we have a
         * chance of catching underruns with the intermediate watermarks
         * vs. the old plane configuration.
         */
        if (DISPLAY_VER(dev_priv) == 2 && planes_disabling(old_crtc_state, new_crtc_state))
                intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false);

        /*
         * WA for platforms where async address update enable bit
         * is double buffered and only latched at start of vblank.
         */
        if (old_crtc_state->uapi.async_flip && !new_crtc_state->uapi.async_flip)
                intel_crtc_async_flip_disable_wa(state, crtc);
}

static void intel_crtc_disable_planes(struct intel_atomic_state *state,
                                      struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        const struct intel_crtc_state *new_crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        unsigned int update_mask = new_crtc_state->update_planes;
        const struct intel_plane_state *old_plane_state;
        struct intel_plane *plane;
        unsigned fb_bits = 0;
        int i;

        intel_crtc_dpms_overlay_disable(crtc);

        for_each_old_intel_plane_in_state(state, plane, old_plane_state, i) {
                if (crtc->pipe != plane->pipe ||
                    !(update_mask & BIT(plane->id)))
                        continue;

                intel_disable_plane(plane, new_crtc_state);

                if (old_plane_state->uapi.visible)
                        fb_bits |= plane->frontbuffer_bit;
        }

        intel_frontbuffer_flip(dev_priv, fb_bits);
}

/*
 * intel_connector_primary_encoder - get the primary encoder for a connector
 * @connector: connector for which to return the encoder
 *
 * Returns the primary encoder for a connector. There is a 1:1 mapping from
 * all connectors to their encoder, except for DP-MST connectors which have
 * both a virtual and a primary encoder. These DP-MST primary encoders can be
 * pointed to by as many DP-MST connectors as there are pipes.
 */
static struct intel_encoder *
intel_connector_primary_encoder(struct intel_connector *connector)
{
        struct intel_encoder *encoder;

        if (connector->mst_port)
                return &dp_to_dig_port(connector->mst_port)->base;

        encoder = intel_attached_encoder(connector);
        drm_WARN_ON(connector->base.dev, !encoder);

        return encoder;
}

static void intel_encoders_update_prepare(struct intel_atomic_state *state)
{
        struct drm_connector_state *new_conn_state;
        struct drm_connector *connector;
        int i;

        for_each_new_connector_in_state(&state->base, connector, new_conn_state,
                                        i) {
                struct intel_connector *intel_connector;
                struct intel_encoder *encoder;
                struct intel_crtc *crtc;

                if (!intel_connector_needs_modeset(state, connector))
                        continue;

                intel_connector = to_intel_connector(connector);
                encoder = intel_connector_primary_encoder(intel_connector);
                if (!encoder->update_prepare)
                        continue;

                crtc = new_conn_state->crtc ?
                        to_intel_crtc(new_conn_state->crtc) : NULL;
                encoder->update_prepare(state, encoder, crtc);
        }
}

static void intel_encoders_update_complete(struct intel_atomic_state *state)
{
        struct drm_connector_state *new_conn_state;
        struct drm_connector *connector;
        int i;

        for_each_new_connector_in_state(&state->base, connector, new_conn_state,
                                        i) {
                struct intel_connector *intel_connector;
                struct intel_encoder *encoder;
                struct intel_crtc *crtc;

                if (!intel_connector_needs_modeset(state, connector))
                        continue;

                intel_connector = to_intel_connector(connector);
                encoder = intel_connector_primary_encoder(intel_connector);
                if (!encoder->update_complete)
                        continue;

                crtc = new_conn_state->crtc ?
                        to_intel_crtc(new_conn_state->crtc) : NULL;
                encoder->update_complete(state, encoder, crtc);
        }
}

static void intel_encoders_pre_pll_enable(struct intel_atomic_state *state,
                                          struct intel_crtc *crtc)
{
        const struct intel_crtc_state *crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        const struct drm_connector_state *conn_state;
        struct drm_connector *conn;
        int i;

        for_each_new_connector_in_state(&state->base, conn, conn_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(conn_state->best_encoder);

                if (conn_state->crtc != &crtc->base)
                        continue;

                if (encoder->pre_pll_enable)
                        encoder->pre_pll_enable(state, encoder,
                                                crtc_state, conn_state);
        }
}

static void intel_encoders_pre_enable(struct intel_atomic_state *state,
                                      struct intel_crtc *crtc)
{
        const struct intel_crtc_state *crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        const struct drm_connector_state *conn_state;
        struct drm_connector *conn;
        int i;

        for_each_new_connector_in_state(&state->base, conn, conn_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(conn_state->best_encoder);

                if (conn_state->crtc != &crtc->base)
                        continue;

                if (encoder->pre_enable)
                        encoder->pre_enable(state, encoder,
                                            crtc_state, conn_state);
        }
}

static void intel_encoders_enable(struct intel_atomic_state *state,
                                  struct intel_crtc *crtc)
{
        const struct intel_crtc_state *crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        const struct drm_connector_state *conn_state;
        struct drm_connector *conn;
        int i;

        for_each_new_connector_in_state(&state->base, conn, conn_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(conn_state->best_encoder);

                if (conn_state->crtc != &crtc->base)
                        continue;

                if (encoder->enable)
                        encoder->enable(state, encoder,
                                        crtc_state, conn_state);
                intel_opregion_notify_encoder(encoder, true);
        }
}

static void intel_encoders_pre_disable(struct intel_atomic_state *state,
                                       struct intel_crtc *crtc)
{
        const struct intel_crtc_state *old_crtc_state =
                intel_atomic_get_old_crtc_state(state, crtc);
        const struct drm_connector_state *old_conn_state;
        struct drm_connector *conn;
        int i;

        for_each_old_connector_in_state(&state->base, conn, old_conn_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(old_conn_state->best_encoder);

                if (old_conn_state->crtc != &crtc->base)
                        continue;

                if (encoder->pre_disable)
                        encoder->pre_disable(state, encoder, old_crtc_state,
                                             old_conn_state);
        }
}

static void intel_encoders_disable(struct intel_atomic_state *state,
                                   struct intel_crtc *crtc)
{
        const struct intel_crtc_state *old_crtc_state =
                intel_atomic_get_old_crtc_state(state, crtc);
        const struct drm_connector_state *old_conn_state;
        struct drm_connector *conn;
        int i;

        for_each_old_connector_in_state(&state->base, conn, old_conn_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(old_conn_state->best_encoder);

                if (old_conn_state->crtc != &crtc->base)
                        continue;

                intel_opregion_notify_encoder(encoder, false);
                if (encoder->disable)
                        encoder->disable(state, encoder,
                                         old_crtc_state, old_conn_state);
        }
}

static void intel_encoders_post_disable(struct intel_atomic_state *state,
                                        struct intel_crtc *crtc)
{
        const struct intel_crtc_state *old_crtc_state =
                intel_atomic_get_old_crtc_state(state, crtc);
        const struct drm_connector_state *old_conn_state;
        struct drm_connector *conn;
        int i;

        for_each_old_connector_in_state(&state->base, conn, old_conn_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(old_conn_state->best_encoder);

                if (old_conn_state->crtc != &crtc->base)
                        continue;

                if (encoder->post_disable)
                        encoder->post_disable(state, encoder,
                                              old_crtc_state, old_conn_state);
        }
}

static void intel_encoders_post_pll_disable(struct intel_atomic_state *state,
                                            struct intel_crtc *crtc)
{
        const struct intel_crtc_state *old_crtc_state =
                intel_atomic_get_old_crtc_state(state, crtc);
        const struct drm_connector_state *old_conn_state;
        struct drm_connector *conn;
        int i;

        for_each_old_connector_in_state(&state->base, conn, old_conn_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(old_conn_state->best_encoder);

                if (old_conn_state->crtc != &crtc->base)
                        continue;

                if (encoder->post_pll_disable)
                        encoder->post_pll_disable(state, encoder,
                                                  old_crtc_state, old_conn_state);
        }
}

static void intel_encoders_update_pipe(struct intel_atomic_state *state,
                                       struct intel_crtc *crtc)
{
        const struct intel_crtc_state *crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        const struct drm_connector_state *conn_state;
        struct drm_connector *conn;
        int i;

        for_each_new_connector_in_state(&state->base, conn, conn_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(conn_state->best_encoder);

                if (conn_state->crtc != &crtc->base)
                        continue;

                if (encoder->update_pipe)
                        encoder->update_pipe(state, encoder,
                                             crtc_state, conn_state);
        }
}

static void intel_disable_primary_plane(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct intel_plane *plane = to_intel_plane(crtc->base.primary);

        plane->disable_plane(plane, crtc_state);
}

static void ilk_crtc_enable(struct intel_atomic_state *state,
                            struct intel_crtc *crtc)
{
        const struct intel_crtc_state *new_crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;

        if (drm_WARN_ON(&dev_priv->drm, crtc->active))
                return;

        /*
         * Sometimes spurious CPU pipe underruns happen during FDI
         * training, at least with VGA+HDMI cloning. Suppress them.
         *
         * On ILK we get an occasional spurious CPU pipe underruns
         * between eDP port A enable and vdd enable. Also PCH port
         * enable seems to result in the occasional CPU pipe underrun.
         *
         * Spurious PCH underruns also occur during PCH enabling.
         */
        intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false);
        intel_set_pch_fifo_underrun_reporting(dev_priv, pipe, false);

        if (intel_crtc_has_dp_encoder(new_crtc_state))
                intel_dp_set_m_n(new_crtc_state, M1_N1);

        intel_set_transcoder_timings(new_crtc_state);
        intel_set_pipe_src_size(new_crtc_state);

        if (new_crtc_state->has_pch_encoder)
                intel_cpu_transcoder_set_m_n(new_crtc_state,
                                             &new_crtc_state->fdi_m_n, NULL);

        ilk_set_pipeconf(new_crtc_state);

        crtc->active = true;

        intel_encoders_pre_enable(state, crtc);

        if (new_crtc_state->has_pch_encoder) {
                /* Note: FDI PLL enabling _must_ be done before we enable the
                 * cpu pipes, hence this is separate from all the other fdi/pch
                 * enabling. */
                ilk_fdi_pll_enable(new_crtc_state);
        } else {
                assert_fdi_tx_disabled(dev_priv, pipe);
                assert_fdi_rx_disabled(dev_priv, pipe);
        }

        ilk_pfit_enable(new_crtc_state);

        /*
         * On ILK+ LUT must be loaded before the pipe is running but with
         * clocks enabled
         */
        intel_color_load_luts(new_crtc_state);
        intel_color_commit(new_crtc_state);
        /* update DSPCNTR to configure gamma for pipe bottom color */
        intel_disable_primary_plane(new_crtc_state);

        if (dev_priv->display.initial_watermarks)
                dev_priv->display.initial_watermarks(state, crtc);
        intel_enable_pipe(new_crtc_state);

        if (new_crtc_state->has_pch_encoder)
                ilk_pch_enable(state, new_crtc_state);

        intel_crtc_vblank_on(new_crtc_state);

        intel_encoders_enable(state, crtc);

        if (HAS_PCH_CPT(dev_priv))
                cpt_verify_modeset(dev_priv, pipe);

        /*
         * Must wait for vblank to avoid spurious PCH FIFO underruns.
         * And a second vblank wait is needed at least on ILK with
         * some interlaced HDMI modes. Let's do the double wait always
         * in case there are more corner cases we don't know about.
         */
        if (new_crtc_state->has_pch_encoder) {
                intel_wait_for_vblank(dev_priv, pipe);
                intel_wait_for_vblank(dev_priv, pipe);
        }
        intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, true);
        intel_set_pch_fifo_underrun_reporting(dev_priv, pipe, true);
}

/* IPS only exists on ULT machines and is tied to pipe A. */
static bool hsw_crtc_supports_ips(struct intel_crtc *crtc)
{
        return HAS_IPS(to_i915(crtc->base.dev)) && crtc->pipe == PIPE_A;
}

static void glk_pipe_scaler_clock_gating_wa(struct drm_i915_private *dev_priv,
                                            enum pipe pipe, bool apply)
{
        u32 val = intel_de_read(dev_priv, CLKGATE_DIS_PSL(pipe));
        u32 mask = DPF_GATING_DIS | DPF_RAM_GATING_DIS | DPFR_GATING_DIS;

        if (apply)
                val |= mask;
        else
                val &= ~mask;

        intel_de_write(dev_priv, CLKGATE_DIS_PSL(pipe), val);
}

static void icl_pipe_mbus_enable(struct intel_crtc *crtc, bool joined_mbus)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;
        u32 val;

        /* Wa_22010947358:adl-p */
        if (IS_ALDERLAKE_P(dev_priv))
                val = joined_mbus ? MBUS_DBOX_A_CREDIT(6) : MBUS_DBOX_A_CREDIT(4);
        else
                val = MBUS_DBOX_A_CREDIT(2);

        if (DISPLAY_VER(dev_priv) >= 12) {
                val |= MBUS_DBOX_BW_CREDIT(2);
                val |= MBUS_DBOX_B_CREDIT(12);
        } else {
                val |= MBUS_DBOX_BW_CREDIT(1);
                val |= MBUS_DBOX_B_CREDIT(8);
        }

        intel_de_write(dev_priv, PIPE_MBUS_DBOX_CTL(pipe), val);
}

static void hsw_set_linetime_wm(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        intel_de_write(dev_priv, WM_LINETIME(crtc->pipe),
                       HSW_LINETIME(crtc_state->linetime) |
                       HSW_IPS_LINETIME(crtc_state->ips_linetime));
}

static void hsw_set_frame_start_delay(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        i915_reg_t reg = CHICKEN_TRANS(crtc_state->cpu_transcoder);
        u32 val;

        val = intel_de_read(dev_priv, reg);
        val &= ~HSW_FRAME_START_DELAY_MASK;
        val |= HSW_FRAME_START_DELAY(dev_priv->framestart_delay - 1);
        intel_de_write(dev_priv, reg, val);
}

static void icl_ddi_bigjoiner_pre_enable(struct intel_atomic_state *state,
                                         const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *master = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(master->base.dev);
        struct intel_crtc_state *master_crtc_state;
        struct drm_connector_state *conn_state;
        struct drm_connector *conn;
        struct intel_encoder *encoder = NULL;
        int i;

        if (crtc_state->bigjoiner_slave)
                master = crtc_state->bigjoiner_linked_crtc;

        master_crtc_state = intel_atomic_get_new_crtc_state(state, master);

        for_each_new_connector_in_state(&state->base, conn, conn_state, i) {
                if (conn_state->crtc != &master->base)
                        continue;

                encoder = to_intel_encoder(conn_state->best_encoder);
                break;
        }

        if (!crtc_state->bigjoiner_slave) {
                /* need to enable VDSC, which we skipped in pre-enable */
                intel_dsc_enable(encoder, crtc_state);
        } else {
                /*
                 * Enable sequence steps 1-7 on bigjoiner master
                 */
                intel_encoders_pre_pll_enable(state, master);
                if (master_crtc_state->shared_dpll)
                        intel_enable_shared_dpll(master_crtc_state);
                intel_encoders_pre_enable(state, master);

                /* and DSC on slave */
                intel_dsc_enable(NULL, crtc_state);
        }

        if (DISPLAY_VER(dev_priv) >= 13)
                intel_uncompressed_joiner_enable(crtc_state);
}

static void hsw_crtc_enable(struct intel_atomic_state *state,
                            struct intel_crtc *crtc)
{
        const struct intel_crtc_state *new_crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe, hsw_workaround_pipe;
        enum transcoder cpu_transcoder = new_crtc_state->cpu_transcoder;
        bool psl_clkgate_wa;

        if (drm_WARN_ON(&dev_priv->drm, crtc->active))
                return;

        if (!new_crtc_state->bigjoiner) {
                intel_encoders_pre_pll_enable(state, crtc);

                if (new_crtc_state->shared_dpll)
                        intel_enable_shared_dpll(new_crtc_state);

                intel_encoders_pre_enable(state, crtc);
        } else {
                icl_ddi_bigjoiner_pre_enable(state, new_crtc_state);
        }

        intel_set_pipe_src_size(new_crtc_state);
        if (DISPLAY_VER(dev_priv) >= 9 || IS_BROADWELL(dev_priv))
                bdw_set_pipemisc(new_crtc_state);

        if (!new_crtc_state->bigjoiner_slave && !transcoder_is_dsi(cpu_transcoder)) {
                intel_set_transcoder_timings(new_crtc_state);

                if (cpu_transcoder != TRANSCODER_EDP)
                        intel_de_write(dev_priv, PIPE_MULT(cpu_transcoder),
                                       new_crtc_state->pixel_multiplier - 1);

                if (new_crtc_state->has_pch_encoder)
                        intel_cpu_transcoder_set_m_n(new_crtc_state,
                                                     &new_crtc_state->fdi_m_n, NULL);

                hsw_set_frame_start_delay(new_crtc_state);
        }

        if (!transcoder_is_dsi(cpu_transcoder))
                hsw_set_pipeconf(new_crtc_state);

        crtc->active = true;

        /* Display WA #1180: WaDisableScalarClockGating: glk */
        psl_clkgate_wa = DISPLAY_VER(dev_priv) == 10 &&
                new_crtc_state->pch_pfit.enabled;
        if (psl_clkgate_wa)
                glk_pipe_scaler_clock_gating_wa(dev_priv, pipe, true);

        if (DISPLAY_VER(dev_priv) >= 9)
                skl_pfit_enable(new_crtc_state);
        else
                ilk_pfit_enable(new_crtc_state);

        /*
         * On ILK+ LUT must be loaded before the pipe is running but with
         * clocks enabled
         */
        intel_color_load_luts(new_crtc_state);
        intel_color_commit(new_crtc_state);
        /* update DSPCNTR to configure gamma/csc for pipe bottom color */
        if (DISPLAY_VER(dev_priv) < 9)
                intel_disable_primary_plane(new_crtc_state);

        hsw_set_linetime_wm(new_crtc_state);

        if (DISPLAY_VER(dev_priv) >= 11)
                icl_set_pipe_chicken(new_crtc_state);

        if (dev_priv->display.initial_watermarks)
                dev_priv->display.initial_watermarks(state, crtc);

        if (DISPLAY_VER(dev_priv) >= 11) {
                const struct intel_dbuf_state *dbuf_state =
                                intel_atomic_get_new_dbuf_state(state);

                icl_pipe_mbus_enable(crtc, dbuf_state->joined_mbus);
        }

        if (new_crtc_state->bigjoiner_slave)
                intel_crtc_vblank_on(new_crtc_state);

        intel_encoders_enable(state, crtc);

        if (psl_clkgate_wa) {
                intel_wait_for_vblank(dev_priv, pipe);
                glk_pipe_scaler_clock_gating_wa(dev_priv, pipe, false);
        }

        /* If we change the relative order between pipe/planes enabling, we need
         * to change the workaround. */
        hsw_workaround_pipe = new_crtc_state->hsw_workaround_pipe;
        if (IS_HASWELL(dev_priv) && hsw_workaround_pipe != INVALID_PIPE) {
                intel_wait_for_vblank(dev_priv, hsw_workaround_pipe);
                intel_wait_for_vblank(dev_priv, hsw_workaround_pipe);
        }
}

void ilk_pfit_disable(const struct intel_crtc_state *old_crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;

        /* To avoid upsetting the power well on haswell only disable the pfit if
         * it's in use. The hw state code will make sure we get this right. */
        if (!old_crtc_state->pch_pfit.enabled)
                return;

        intel_de_write(dev_priv, PF_CTL(pipe), 0);
        intel_de_write(dev_priv, PF_WIN_POS(pipe), 0);
        intel_de_write(dev_priv, PF_WIN_SZ(pipe), 0);
}

static void ilk_crtc_disable(struct intel_atomic_state *state,
                             struct intel_crtc *crtc)
{
        const struct intel_crtc_state *old_crtc_state =
                intel_atomic_get_old_crtc_state(state, crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;

        /*
         * Sometimes spurious CPU pipe underruns happen when the
         * pipe is already disabled, but FDI RX/TX is still enabled.
         * Happens at least with VGA+HDMI cloning. Suppress them.
         */
        intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false);
        intel_set_pch_fifo_underrun_reporting(dev_priv, pipe, false);

        intel_encoders_disable(state, crtc);

        intel_crtc_vblank_off(old_crtc_state);

        intel_disable_pipe(old_crtc_state);

        ilk_pfit_disable(old_crtc_state);

        if (old_crtc_state->has_pch_encoder)
                ilk_fdi_disable(crtc);

        intel_encoders_post_disable(state, crtc);

        if (old_crtc_state->has_pch_encoder) {
                ilk_disable_pch_transcoder(dev_priv, pipe);

                if (HAS_PCH_CPT(dev_priv)) {
                        i915_reg_t reg;
                        u32 temp;

                        /* disable TRANS_DP_CTL */
                        reg = TRANS_DP_CTL(pipe);
                        temp = intel_de_read(dev_priv, reg);
                        temp &= ~(TRANS_DP_OUTPUT_ENABLE |
                                  TRANS_DP_PORT_SEL_MASK);
                        temp |= TRANS_DP_PORT_SEL_NONE;
                        intel_de_write(dev_priv, reg, temp);

                        /* disable DPLL_SEL */
                        temp = intel_de_read(dev_priv, PCH_DPLL_SEL);
                        temp &= ~(TRANS_DPLL_ENABLE(pipe) | TRANS_DPLLB_SEL(pipe));
                        intel_de_write(dev_priv, PCH_DPLL_SEL, temp);
                }

                ilk_fdi_pll_disable(crtc);
        }

        intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, true);
        intel_set_pch_fifo_underrun_reporting(dev_priv, pipe, true);
}

static void hsw_crtc_disable(struct intel_atomic_state *state,
                             struct intel_crtc *crtc)
{
        /*
         * FIXME collapse everything to one hook.
         * Need care with mst->ddi interactions.
         */
        intel_encoders_disable(state, crtc);
        intel_encoders_post_disable(state, crtc);
}

static void i9xx_pfit_enable(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        if (!crtc_state->gmch_pfit.control)
                return;

        /*
         * The panel fitter should only be adjusted whilst the pipe is disabled,
         * according to register description and PRM.
         */
        drm_WARN_ON(&dev_priv->drm,
                    intel_de_read(dev_priv, PFIT_CONTROL) & PFIT_ENABLE);
        assert_pipe_disabled(dev_priv, crtc_state->cpu_transcoder);

        intel_de_write(dev_priv, PFIT_PGM_RATIOS,
                       crtc_state->gmch_pfit.pgm_ratios);
        intel_de_write(dev_priv, PFIT_CONTROL, crtc_state->gmch_pfit.control);

        /* Border color in case we don't scale up to the full screen. Black by
         * default, change to something else for debugging. */
        intel_de_write(dev_priv, BCLRPAT(crtc->pipe), 0);
}

bool intel_phy_is_combo(struct drm_i915_private *dev_priv, enum phy phy)
{
        if (phy == PHY_NONE)
                return false;
        else if (IS_DG2(dev_priv))
                /*
                 * DG2 outputs labelled as "combo PHY" in the bspec use
                 * SNPS PHYs with completely different programming,
                 * hence we always return false here.
                 */
                return false;
        else if (IS_ALDERLAKE_S(dev_priv))
                return phy <= PHY_E;
        else if (IS_DG1(dev_priv) || IS_ROCKETLAKE(dev_priv))
                return phy <= PHY_D;
        else if (IS_JSL_EHL(dev_priv))
                return phy <= PHY_C;
        else if (DISPLAY_VER(dev_priv) >= 11)
                return phy <= PHY_B;
        else
                return false;
}

bool intel_phy_is_tc(struct drm_i915_private *dev_priv, enum phy phy)
{
        if (IS_DG2(dev_priv))
                /* DG2's "TC1" output uses a SNPS PHY */
                return false;
        else if (IS_ALDERLAKE_P(dev_priv))
                return phy >= PHY_F && phy <= PHY_I;
        else if (IS_TIGERLAKE(dev_priv))
                return phy >= PHY_D && phy <= PHY_I;
        else if (IS_ICELAKE(dev_priv))
                return phy >= PHY_C && phy <= PHY_F;
        else
                return false;
}

bool intel_phy_is_snps(struct drm_i915_private *dev_priv, enum phy phy)
{
        if (phy == PHY_NONE)
                return false;
        else if (IS_DG2(dev_priv))
                /*
                 * All four "combo" ports and the TC1 port (PHY E) use
                 * Synopsis PHYs.
                 */
                return phy <= PHY_E;

        return false;
}

enum phy intel_port_to_phy(struct drm_i915_private *i915, enum port port)
{
        if (DISPLAY_VER(i915) >= 13 && port >= PORT_D_XELPD)
                return PHY_D + port - PORT_D_XELPD;
        else if (DISPLAY_VER(i915) >= 13 && port >= PORT_TC1)
                return PHY_F + port - PORT_TC1;
        else if (IS_ALDERLAKE_S(i915) && port >= PORT_TC1)
                return PHY_B + port - PORT_TC1;
        else if ((IS_DG1(i915) || IS_ROCKETLAKE(i915)) && port >= PORT_TC1)
                return PHY_C + port - PORT_TC1;
        else if (IS_JSL_EHL(i915) && port == PORT_D)
                return PHY_A;

        return PHY_A + port - PORT_A;
}

enum tc_port intel_port_to_tc(struct drm_i915_private *dev_priv, enum port port)
{
        if (!intel_phy_is_tc(dev_priv, intel_port_to_phy(dev_priv, port)))
                return TC_PORT_NONE;

        if (DISPLAY_VER(dev_priv) >= 12)
                return TC_PORT_1 + port - PORT_TC1;
        else
                return TC_PORT_1 + port - PORT_C;
}

enum intel_display_power_domain intel_port_to_power_domain(enum port port)
{
        switch (port) {
        case PORT_A:
                return POWER_DOMAIN_PORT_DDI_A_LANES;
        case PORT_B:
                return POWER_DOMAIN_PORT_DDI_B_LANES;
        case PORT_C:
                return POWER_DOMAIN_PORT_DDI_C_LANES;
        case PORT_D:
                return POWER_DOMAIN_PORT_DDI_D_LANES;
        case PORT_E:
                return POWER_DOMAIN_PORT_DDI_E_LANES;
        case PORT_F:
                return POWER_DOMAIN_PORT_DDI_F_LANES;
        case PORT_G:
                return POWER_DOMAIN_PORT_DDI_G_LANES;
        case PORT_H:
                return POWER_DOMAIN_PORT_DDI_H_LANES;
        case PORT_I:
                return POWER_DOMAIN_PORT_DDI_I_LANES;
        default:
                MISSING_CASE(port);
                return POWER_DOMAIN_PORT_OTHER;
        }
}

enum intel_display_power_domain
intel_aux_power_domain(struct intel_digital_port *dig_port)
{
        struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
        enum phy phy = intel_port_to_phy(dev_priv, dig_port->base.port);

        if (intel_phy_is_tc(dev_priv, phy) &&
            dig_port->tc_mode == TC_PORT_TBT_ALT) {
                switch (dig_port->aux_ch) {
                case AUX_CH_C:
                        return POWER_DOMAIN_AUX_C_TBT;
                case AUX_CH_D:
                        return POWER_DOMAIN_AUX_D_TBT;
                case AUX_CH_E:
                        return POWER_DOMAIN_AUX_E_TBT;
                case AUX_CH_F:
                        return POWER_DOMAIN_AUX_F_TBT;
                case AUX_CH_G:
                        return POWER_DOMAIN_AUX_G_TBT;
                case AUX_CH_H:
                        return POWER_DOMAIN_AUX_H_TBT;
                case AUX_CH_I:
                        return POWER_DOMAIN_AUX_I_TBT;
                default:
                        MISSING_CASE(dig_port->aux_ch);
                        return POWER_DOMAIN_AUX_C_TBT;
                }
        }

        return intel_legacy_aux_to_power_domain(dig_port->aux_ch);
}

/*
 * Converts aux_ch to power_domain without caring about TBT ports for that use
 * intel_aux_power_domain()
 */
enum intel_display_power_domain
intel_legacy_aux_to_power_domain(enum aux_ch aux_ch)
{
        switch (aux_ch) {
        case AUX_CH_A:
                return POWER_DOMAIN_AUX_A;
        case AUX_CH_B:
                return POWER_DOMAIN_AUX_B;
        case AUX_CH_C:
                return POWER_DOMAIN_AUX_C;
        case AUX_CH_D:
                return POWER_DOMAIN_AUX_D;
        case AUX_CH_E:
                return POWER_DOMAIN_AUX_E;
        case AUX_CH_F:
                return POWER_DOMAIN_AUX_F;
        case AUX_CH_G:
                return POWER_DOMAIN_AUX_G;
        case AUX_CH_H:
                return POWER_DOMAIN_AUX_H;
        case AUX_CH_I:
                return POWER_DOMAIN_AUX_I;
        default:
                MISSING_CASE(aux_ch);
                return POWER_DOMAIN_AUX_A;
        }
}

static u64 get_crtc_power_domains(struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct drm_encoder *encoder;
        enum pipe pipe = crtc->pipe;
        u64 mask;
        enum transcoder transcoder = crtc_state->cpu_transcoder;

        if (!crtc_state->hw.active)
                return 0;

        mask = BIT_ULL(POWER_DOMAIN_PIPE(pipe));
        mask |= BIT_ULL(POWER_DOMAIN_TRANSCODER(transcoder));
        if (crtc_state->pch_pfit.enabled ||
            crtc_state->pch_pfit.force_thru)
                mask |= BIT_ULL(POWER_DOMAIN_PIPE_PANEL_FITTER(pipe));

        drm_for_each_encoder_mask(encoder, &dev_priv->drm,
                                  crtc_state->uapi.encoder_mask) {
                struct intel_encoder *intel_encoder = to_intel_encoder(encoder);

                mask |= BIT_ULL(intel_encoder->power_domain);
        }

        if (HAS_DDI(dev_priv) && crtc_state->has_audio)
                mask |= BIT_ULL(POWER_DOMAIN_AUDIO_MMIO);

        if (crtc_state->shared_dpll)
                mask |= BIT_ULL(POWER_DOMAIN_DISPLAY_CORE);

        if (crtc_state->dsc.compression_enable)
                mask |= BIT_ULL(intel_dsc_power_domain(crtc_state));

        return mask;
}

static u64
modeset_get_crtc_power_domains(struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum intel_display_power_domain domain;
        u64 domains, new_domains, old_domains;

        domains = get_crtc_power_domains(crtc_state);

        new_domains = domains & ~crtc->enabled_power_domains.mask;
        old_domains = crtc->enabled_power_domains.mask & ~domains;

        for_each_power_domain(domain, new_domains)
                intel_display_power_get_in_set(dev_priv,
                                               &crtc->enabled_power_domains,
                                               domain);

        return old_domains;
}

static void modeset_put_crtc_power_domains(struct intel_crtc *crtc,
                                           u64 domains)
{
        intel_display_power_put_mask_in_set(to_i915(crtc->base.dev),
                                            &crtc->enabled_power_domains,
                                            domains);
}

static void valleyview_crtc_enable(struct intel_atomic_state *state,
                                   struct intel_crtc *crtc)
{
        const struct intel_crtc_state *new_crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;

        if (drm_WARN_ON(&dev_priv->drm, crtc->active))
                return;

        if (intel_crtc_has_dp_encoder(new_crtc_state))
                intel_dp_set_m_n(new_crtc_state, M1_N1);

        intel_set_transcoder_timings(new_crtc_state);
        intel_set_pipe_src_size(new_crtc_state);

        if (IS_CHERRYVIEW(dev_priv) && pipe == PIPE_B) {
                intel_de_write(dev_priv, CHV_BLEND(pipe), CHV_BLEND_LEGACY);
                intel_de_write(dev_priv, CHV_CANVAS(pipe), 0);
        }

        i9xx_set_pipeconf(new_crtc_state);

        crtc->active = true;

        intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, true);

        intel_encoders_pre_pll_enable(state, crtc);

        if (IS_CHERRYVIEW(dev_priv))
                chv_enable_pll(new_crtc_state);
        else
                vlv_enable_pll(new_crtc_state);

        intel_encoders_pre_enable(state, crtc);

        i9xx_pfit_enable(new_crtc_state);

        intel_color_load_luts(new_crtc_state);
        intel_color_commit(new_crtc_state);
        /* update DSPCNTR to configure gamma for pipe bottom color */
        intel_disable_primary_plane(new_crtc_state);

        dev_priv->display.initial_watermarks(state, crtc);
        intel_enable_pipe(new_crtc_state);

        intel_crtc_vblank_on(new_crtc_state);

        intel_encoders_enable(state, crtc);
}

static void i9xx_crtc_enable(struct intel_atomic_state *state,
                             struct intel_crtc *crtc)
{
        const struct intel_crtc_state *new_crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;

        if (drm_WARN_ON(&dev_priv->drm, crtc->active))
                return;

        if (intel_crtc_has_dp_encoder(new_crtc_state))
                intel_dp_set_m_n(new_crtc_state, M1_N1);

        intel_set_transcoder_timings(new_crtc_state);
        intel_set_pipe_src_size(new_crtc_state);

        i9xx_set_pipeconf(new_crtc_state);

        crtc->active = true;

        if (DISPLAY_VER(dev_priv) != 2)
                intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, true);

        intel_encoders_pre_enable(state, crtc);

        i9xx_enable_pll(new_crtc_state);

        i9xx_pfit_enable(new_crtc_state);

        intel_color_load_luts(new_crtc_state);
        intel_color_commit(new_crtc_state);
        /* update DSPCNTR to configure gamma for pipe bottom color */
        intel_disable_primary_plane(new_crtc_state);

        if (dev_priv->display.initial_watermarks)
                dev_priv->display.initial_watermarks(state, crtc);
        else
                intel_update_watermarks(crtc);
        intel_enable_pipe(new_crtc_state);

        intel_crtc_vblank_on(new_crtc_state);

        intel_encoders_enable(state, crtc);

        /* prevents spurious underruns */
        if (DISPLAY_VER(dev_priv) == 2)
                intel_wait_for_vblank(dev_priv, pipe);
}

static void i9xx_pfit_disable(const struct intel_crtc_state *old_crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        if (!old_crtc_state->gmch_pfit.control)
                return;

        assert_pipe_disabled(dev_priv, old_crtc_state->cpu_transcoder);

        drm_dbg_kms(&dev_priv->drm, "disabling pfit, current: 0x%08x\n",
                    intel_de_read(dev_priv, PFIT_CONTROL));
        intel_de_write(dev_priv, PFIT_CONTROL, 0);
}

static void i9xx_crtc_disable(struct intel_atomic_state *state,
                              struct intel_crtc *crtc)
{
        struct intel_crtc_state *old_crtc_state =
                intel_atomic_get_old_crtc_state(state, crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;

        /*
         * On gen2 planes are double buffered but the pipe isn't, so we must
         * wait for planes to fully turn off before disabling the pipe.
         */
        if (DISPLAY_VER(dev_priv) == 2)
                intel_wait_for_vblank(dev_priv, pipe);

        intel_encoders_disable(state, crtc);

        intel_crtc_vblank_off(old_crtc_state);

        intel_disable_pipe(old_crtc_state);

        i9xx_pfit_disable(old_crtc_state);

        intel_encoders_post_disable(state, crtc);

        if (!intel_crtc_has_type(old_crtc_state, INTEL_OUTPUT_DSI)) {
                if (IS_CHERRYVIEW(dev_priv))
                        chv_disable_pll(dev_priv, pipe);
                else if (IS_VALLEYVIEW(dev_priv))
                        vlv_disable_pll(dev_priv, pipe);
                else
                        i9xx_disable_pll(old_crtc_state);
        }

        intel_encoders_post_pll_disable(state, crtc);

        if (DISPLAY_VER(dev_priv) != 2)
                intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false);

        if (!dev_priv->display.initial_watermarks)
                intel_update_watermarks(crtc);

        /* clock the pipe down to 640x480@60 to potentially save power */
        if (IS_I830(dev_priv))
                i830_enable_pipe(dev_priv, pipe);
}

static void intel_crtc_disable_noatomic(struct intel_crtc *crtc,
                                        struct drm_modeset_acquire_ctx *ctx)
{
        struct intel_encoder *encoder;
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct intel_bw_state *bw_state =
                to_intel_bw_state(dev_priv->bw_obj.state);
        struct intel_cdclk_state *cdclk_state =
                to_intel_cdclk_state(dev_priv->cdclk.obj.state);
        struct intel_dbuf_state *dbuf_state =
                to_intel_dbuf_state(dev_priv->dbuf.obj.state);
        struct intel_crtc_state *crtc_state =
                to_intel_crtc_state(crtc->base.state);
        struct intel_plane *plane;
        struct drm_atomic_state *state;
        struct intel_crtc_state *temp_crtc_state;
        enum pipe pipe = crtc->pipe;
        int ret;

        if (!crtc_state->hw.active)
                return;

        for_each_intel_plane_on_crtc(&dev_priv->drm, crtc, plane) {
                const struct intel_plane_state *plane_state =
                        to_intel_plane_state(plane->base.state);

                if (plane_state->uapi.visible)
                        intel_plane_disable_noatomic(crtc, plane);
        }

        state = drm_atomic_state_alloc(&dev_priv->drm);
        if (!state) {
                drm_dbg_kms(&dev_priv->drm,
                            "failed to disable [CRTC:%d:%s], out of memory",
                            crtc->base.base.id, crtc->base.name);
                return;
        }

        state->acquire_ctx = ctx;

        /* Everything's already locked, -EDEADLK can't happen. */
        temp_crtc_state = intel_atomic_get_crtc_state(state, crtc);
        ret = drm_atomic_add_affected_connectors(state, &crtc->base);

        drm_WARN_ON(&dev_priv->drm, IS_ERR(temp_crtc_state) || ret);

        dev_priv->display.crtc_disable(to_intel_atomic_state(state), crtc);

        drm_atomic_state_put(state);

        drm_dbg_kms(&dev_priv->drm,
                    "[CRTC:%d:%s] hw state adjusted, was enabled, now disabled\n",
                    crtc->base.base.id, crtc->base.name);

        crtc->active = false;
        crtc->base.enabled = false;

        drm_WARN_ON(&dev_priv->drm,
                    drm_atomic_set_mode_for_crtc(&crtc_state->uapi, NULL) < 0);
        crtc_state->uapi.active = false;
        crtc_state->uapi.connector_mask = 0;
        crtc_state->uapi.encoder_mask = 0;
        intel_crtc_free_hw_state(crtc_state);
        memset(&crtc_state->hw, 0, sizeof(crtc_state->hw));

        for_each_encoder_on_crtc(&dev_priv->drm, &crtc->base, encoder)
                encoder->base.crtc = NULL;

        intel_fbc_disable(crtc);
        intel_update_watermarks(crtc);
        intel_disable_shared_dpll(crtc_state);

        intel_display_power_put_all_in_set(dev_priv, &crtc->enabled_power_domains);

        dev_priv->active_pipes &= ~BIT(pipe);
        cdclk_state->min_cdclk[pipe] = 0;
        cdclk_state->min_voltage_level[pipe] = 0;
        cdclk_state->active_pipes &= ~BIT(pipe);

        dbuf_state->active_pipes &= ~BIT(pipe);

        bw_state->data_rate[pipe] = 0;
        bw_state->num_active_planes[pipe] = 0;
}

/*
 * turn all crtc's off, but do not adjust state
 * This has to be paired with a call to intel_modeset_setup_hw_state.
 */
int intel_display_suspend(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_atomic_state *state;
        int ret;

        if (!HAS_DISPLAY(dev_priv))
                return 0;

        state = drm_atomic_helper_suspend(dev);
        ret = PTR_ERR_OR_ZERO(state);
        if (ret)
                drm_err(&dev_priv->drm, "Suspending crtc's failed with %i\n",
                        ret);
        else
                dev_priv->modeset_restore_state = state;
        return ret;
}

void intel_encoder_destroy(struct drm_encoder *encoder)
{
        struct intel_encoder *intel_encoder = to_intel_encoder(encoder);

        drm_encoder_cleanup(encoder);
        kfree(intel_encoder);
}

/* Cross check the actual hw state with our own modeset state tracking (and it's
 * internal consistency). */
static void intel_connector_verify_state(struct intel_crtc_state *crtc_state,
                                         struct drm_connector_state *conn_state)
{
        struct intel_connector *connector = to_intel_connector(conn_state->connector);
        struct drm_i915_private *i915 = to_i915(connector->base.dev);

        drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s]\n",
                    connector->base.base.id, connector->base.name);

        if (connector->get_hw_state(connector)) {
                struct intel_encoder *encoder = intel_attached_encoder(connector);

                I915_STATE_WARN(!crtc_state,
                         "connector enabled without attached crtc\n");

                if (!crtc_state)
                        return;

                I915_STATE_WARN(!crtc_state->hw.active,
                                "connector is active, but attached crtc isn't\n");

                if (!encoder || encoder->type == INTEL_OUTPUT_DP_MST)
                        return;

                I915_STATE_WARN(conn_state->best_encoder != &encoder->base,
                        "atomic encoder doesn't match attached encoder\n");

                I915_STATE_WARN(conn_state->crtc != encoder->base.crtc,
                        "attached encoder crtc differs from connector crtc\n");
        } else {
                I915_STATE_WARN(crtc_state && crtc_state->hw.active,
                                "attached crtc is active, but connector isn't\n");
                I915_STATE_WARN(!crtc_state && conn_state->best_encoder,
                        "best encoder set without crtc!\n");
        }
}

bool hsw_crtc_state_ips_capable(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        /* IPS only exists on ULT machines and is tied to pipe A. */
        if (!hsw_crtc_supports_ips(crtc))
                return false;

        if (!dev_priv->params.enable_ips)
                return false;

        if (crtc_state->pipe_bpp > 24)
                return false;

        /*
         * We compare against max which means we must take
         * the increased cdclk requirement into account when
         * calculating the new cdclk.
         *
         * Should measure whether using a lower cdclk w/o IPS
         */
        if (IS_BROADWELL(dev_priv) &&
            crtc_state->pixel_rate > dev_priv->max_cdclk_freq * 95 / 100)
                return false;

        return true;
}

static int hsw_compute_ips_config(struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv =
                to_i915(crtc_state->uapi.crtc->dev);
        struct intel_atomic_state *state =
                to_intel_atomic_state(crtc_state->uapi.state);

        crtc_state->ips_enabled = false;

        if (!hsw_crtc_state_ips_capable(crtc_state))
                return 0;

        /*
         * When IPS gets enabled, the pipe CRC changes. Since IPS gets
         * enabled and disabled dynamically based on package C states,
         * user space can't make reliable use of the CRCs, so let's just
         * completely disable it.
         */
        if (crtc_state->crc_enabled)
                return 0;

        /* IPS should be fine as long as at least one plane is enabled. */
        if (!(crtc_state->active_planes & ~BIT(PLANE_CURSOR)))
                return 0;

        if (IS_BROADWELL(dev_priv)) {
                const struct intel_cdclk_state *cdclk_state;

                cdclk_state = intel_atomic_get_cdclk_state(state);
                if (IS_ERR(cdclk_state))
                        return PTR_ERR(cdclk_state);

                /* pixel rate mustn't exceed 95% of cdclk with IPS on BDW */
                if (crtc_state->pixel_rate > cdclk_state->logical.cdclk * 95 / 100)
                        return 0;
        }

        crtc_state->ips_enabled = true;

        return 0;
}

static bool intel_crtc_supports_double_wide(const struct intel_crtc *crtc)
{
        const struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        /* GDG double wide on either pipe, otherwise pipe A only */
        return DISPLAY_VER(dev_priv) < 4 &&
                (crtc->pipe == PIPE_A || IS_I915G(dev_priv));
}

static u32 ilk_pipe_pixel_rate(const struct intel_crtc_state *crtc_state)
{
        u32 pixel_rate = crtc_state->hw.pipe_mode.crtc_clock;
        struct drm_rect src;

        /*
         * We only use IF-ID interlacing. If we ever use
         * PF-ID we'll need to adjust the pixel_rate here.
         */

        if (!crtc_state->pch_pfit.enabled)
                return pixel_rate;

        drm_rect_init(&src, 0, 0,
                      crtc_state->pipe_src_w << 16,
                      crtc_state->pipe_src_h << 16);

        return intel_adjusted_rate(&src, &crtc_state->pch_pfit.dst,
                                   pixel_rate);
}

static void intel_mode_from_crtc_timings(struct drm_display_mode *mode,
                                         const struct drm_display_mode *timings)
{
        mode->hdisplay = timings->crtc_hdisplay;
        mode->htotal = timings->crtc_htotal;
        mode->hsync_start = timings->crtc_hsync_start;
        mode->hsync_end = timings->crtc_hsync_end;

        mode->vdisplay = timings->crtc_vdisplay;
        mode->vtotal = timings->crtc_vtotal;
        mode->vsync_start = timings->crtc_vsync_start;
        mode->vsync_end = timings->crtc_vsync_end;

        mode->flags = timings->flags;
        mode->type = DRM_MODE_TYPE_DRIVER;

        mode->clock = timings->crtc_clock;

        drm_mode_set_name(mode);
}

static void intel_crtc_compute_pixel_rate(struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);

        if (HAS_GMCH(dev_priv))
                /* FIXME calculate proper pipe pixel rate for GMCH pfit */
                crtc_state->pixel_rate =
                        crtc_state->hw.pipe_mode.crtc_clock;
        else
                crtc_state->pixel_rate =
                        ilk_pipe_pixel_rate(crtc_state);
}

static void intel_crtc_readout_derived_state(struct intel_crtc_state *crtc_state)
{
        struct drm_display_mode *mode = &crtc_state->hw.mode;
        struct drm_display_mode *pipe_mode = &crtc_state->hw.pipe_mode;
        struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;

        drm_mode_copy(pipe_mode, adjusted_mode);

        if (crtc_state->bigjoiner) {
                /*
                 * transcoder is programmed to the full mode,
                 * but pipe timings are half of the transcoder mode
                 */
                pipe_mode->crtc_hdisplay /= 2;
                pipe_mode->crtc_hblank_start /= 2;
                pipe_mode->crtc_hblank_end /= 2;
                pipe_mode->crtc_hsync_start /= 2;
                pipe_mode->crtc_hsync_end /= 2;
                pipe_mode->crtc_htotal /= 2;
                pipe_mode->crtc_clock /= 2;
        }

        if (crtc_state->splitter.enable) {
                int n = crtc_state->splitter.link_count;
                int overlap = crtc_state->splitter.pixel_overlap;

                /*
                 * eDP MSO uses segment timings from EDID for transcoder
                 * timings, but full mode for everything else.
                 *
                 * h_full = (h_segment - pixel_overlap) * link_count
                 */
                pipe_mode->crtc_hdisplay = (pipe_mode->crtc_hdisplay - overlap) * n;
                pipe_mode->crtc_hblank_start = (pipe_mode->crtc_hblank_start - overlap) * n;
                pipe_mode->crtc_hblank_end = (pipe_mode->crtc_hblank_end - overlap) * n;
                pipe_mode->crtc_hsync_start = (pipe_mode->crtc_hsync_start - overlap) * n;
                pipe_mode->crtc_hsync_end = (pipe_mode->crtc_hsync_end - overlap) * n;
                pipe_mode->crtc_htotal = (pipe_mode->crtc_htotal - overlap) * n;
                pipe_mode->crtc_clock *= n;

                intel_mode_from_crtc_timings(pipe_mode, pipe_mode);
                intel_mode_from_crtc_timings(adjusted_mode, pipe_mode);
        } else {
                intel_mode_from_crtc_timings(pipe_mode, pipe_mode);
                intel_mode_from_crtc_timings(adjusted_mode, adjusted_mode);
        }

        intel_crtc_compute_pixel_rate(crtc_state);

        drm_mode_copy(mode, adjusted_mode);
        mode->hdisplay = crtc_state->pipe_src_w << crtc_state->bigjoiner;
        mode->vdisplay = crtc_state->pipe_src_h;
}

static void intel_encoder_get_config(struct intel_encoder *encoder,
                                     struct intel_crtc_state *crtc_state)
{
        encoder->get_config(encoder, crtc_state);

        intel_crtc_readout_derived_state(crtc_state);
}

static int intel_crtc_compute_config(struct intel_crtc *crtc,
                                     struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct drm_display_mode *pipe_mode = &pipe_config->hw.pipe_mode;
        int clock_limit = dev_priv->max_dotclk_freq;

        drm_mode_copy(pipe_mode, &pipe_config->hw.adjusted_mode);

        /* Adjust pipe_mode for bigjoiner, with half the horizontal mode */
        if (pipe_config->bigjoiner) {
                pipe_mode->crtc_clock /= 2;
                pipe_mode->crtc_hdisplay /= 2;
                pipe_mode->crtc_hblank_start /= 2;
                pipe_mode->crtc_hblank_end /= 2;
                pipe_mode->crtc_hsync_start /= 2;
                pipe_mode->crtc_hsync_end /= 2;
                pipe_mode->crtc_htotal /= 2;
                pipe_config->pipe_src_w /= 2;
        }

        if (pipe_config->splitter.enable) {
                int n = pipe_config->splitter.link_count;
                int overlap = pipe_config->splitter.pixel_overlap;

                pipe_mode->crtc_hdisplay = (pipe_mode->crtc_hdisplay - overlap) * n;
                pipe_mode->crtc_hblank_start = (pipe_mode->crtc_hblank_start - overlap) * n;
                pipe_mode->crtc_hblank_end = (pipe_mode->crtc_hblank_end - overlap) * n;
                pipe_mode->crtc_hsync_start = (pipe_mode->crtc_hsync_start - overlap) * n;
                pipe_mode->crtc_hsync_end = (pipe_mode->crtc_hsync_end - overlap) * n;
                pipe_mode->crtc_htotal = (pipe_mode->crtc_htotal - overlap) * n;
                pipe_mode->crtc_clock *= n;
        }

        intel_mode_from_crtc_timings(pipe_mode, pipe_mode);

        if (DISPLAY_VER(dev_priv) < 4) {
                clock_limit = dev_priv->max_cdclk_freq * 9 / 10;

                /*
                 * Enable double wide mode when the dot clock
                 * is > 90% of the (display) core speed.
                 */
                if (intel_crtc_supports_double_wide(crtc) &&
                    pipe_mode->crtc_clock > clock_limit) {
                        clock_limit = dev_priv->max_dotclk_freq;
                        pipe_config->double_wide = true;
                }
        }

        if (pipe_mode->crtc_clock > clock_limit) {
                drm_dbg_kms(&dev_priv->drm,
                            "requested pixel clock (%d kHz) too high (max: %d kHz, double wide: %s)\n",
                            pipe_mode->crtc_clock, clock_limit,
                            yesno(pipe_config->double_wide));
                return -EINVAL;
        }

        /*
         * Pipe horizontal size must be even in:
         * - DVO ganged mode
         * - LVDS dual channel mode
         * - Double wide pipe
         */
        if (pipe_config->pipe_src_w & 1) {
                if (pipe_config->double_wide) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "Odd pipe source width not supported with double wide pipe\n");
                        return -EINVAL;
                }

                if (intel_crtc_has_type(pipe_config, INTEL_OUTPUT_LVDS) &&
                    intel_is_dual_link_lvds(dev_priv)) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "Odd pipe source width not supported with dual link LVDS\n");
                        return -EINVAL;
                }
        }

        /* Cantiga+ cannot handle modes with a hsync front porch of 0.
         * WaPruneModeWithIncorrectHsyncOffset:ctg,elk,ilk,snb,ivb,vlv,hsw.
         */
        if ((DISPLAY_VER(dev_priv) > 4 || IS_G4X(dev_priv)) &&
            pipe_mode->crtc_hsync_start == pipe_mode->crtc_hdisplay)
                return -EINVAL;

        intel_crtc_compute_pixel_rate(pipe_config);

        if (pipe_config->has_pch_encoder)
                return ilk_fdi_compute_config(crtc, pipe_config);

        return 0;
}

static void
intel_reduce_m_n_ratio(u32 *num, u32 *den)
{
        while (*num > DATA_LINK_M_N_MASK ||
               *den > DATA_LINK_M_N_MASK) {
                *num >>= 1;
                *den >>= 1;
        }
}

static void compute_m_n(unsigned int m, unsigned int n,
                        u32 *ret_m, u32 *ret_n,
                        bool constant_n)
{
        /*
         * Several DP dongles in particular seem to be fussy about
         * too large link M/N values. Give N value as 0x8000 that
         * should be acceptable by specific devices. 0x8000 is the
         * specified fixed N value for asynchronous clock mode,
         * which the devices expect also in synchronous clock mode.
         */
        if (constant_n)
                *ret_n = DP_LINK_CONSTANT_N_VALUE;
        else
                *ret_n = min_t(unsigned int, roundup_pow_of_two(n), DATA_LINK_N_MAX);

        *ret_m = div_u64(mul_u32_u32(m, *ret_n), n);
        intel_reduce_m_n_ratio(ret_m, ret_n);
}

void
intel_link_compute_m_n(u16 bits_per_pixel, int nlanes,
                       int pixel_clock, int link_clock,
                       struct intel_link_m_n *m_n,
                       bool constant_n, bool fec_enable)
{
        u32 data_clock = bits_per_pixel * pixel_clock;

        if (fec_enable)
                data_clock = intel_dp_mode_to_fec_clock(data_clock);

        m_n->tu = 64;
        compute_m_n(data_clock,
                    link_clock * nlanes * 8,
                    &m_n->gmch_m, &m_n->gmch_n,
                    constant_n);

        compute_m_n(pixel_clock, link_clock,
                    &m_n->link_m, &m_n->link_n,
                    constant_n);
}

static void intel_panel_sanitize_ssc(struct drm_i915_private *dev_priv)
{
        /*
         * There may be no VBT; and if the BIOS enabled SSC we can
         * just keep using it to avoid unnecessary flicker.  Whereas if the
         * BIOS isn't using it, don't assume it will work even if the VBT
         * indicates as much.
         */
        if (HAS_PCH_IBX(dev_priv) || HAS_PCH_CPT(dev_priv)) {
                bool bios_lvds_use_ssc = intel_de_read(dev_priv,
                                                       PCH_DREF_CONTROL) &
                        DREF_SSC1_ENABLE;

                if (dev_priv->vbt.lvds_use_ssc != bios_lvds_use_ssc) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "SSC %s by BIOS, overriding VBT which says %s\n",
                                    enableddisabled(bios_lvds_use_ssc),
                                    enableddisabled(dev_priv->vbt.lvds_use_ssc));
                        dev_priv->vbt.lvds_use_ssc = bios_lvds_use_ssc;
                }
        }
}

static void intel_pch_transcoder_set_m_n(const struct intel_crtc_state *crtc_state,
                                         const struct intel_link_m_n *m_n)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;

        intel_de_write(dev_priv, PCH_TRANS_DATA_M1(pipe),
                       TU_SIZE(m_n->tu) | m_n->gmch_m);
        intel_de_write(dev_priv, PCH_TRANS_DATA_N1(pipe), m_n->gmch_n);
        intel_de_write(dev_priv, PCH_TRANS_LINK_M1(pipe), m_n->link_m);
        intel_de_write(dev_priv, PCH_TRANS_LINK_N1(pipe), m_n->link_n);
}

static bool transcoder_has_m2_n2(struct drm_i915_private *dev_priv,
                                 enum transcoder transcoder)
{
        if (IS_HASWELL(dev_priv))
                return transcoder == TRANSCODER_EDP;

        /*
         * Strictly speaking some registers are available before
         * gen7, but we only support DRRS on gen7+
         */
        return DISPLAY_VER(dev_priv) == 7 || IS_CHERRYVIEW(dev_priv);
}

static void intel_cpu_transcoder_set_m_n(const struct intel_crtc_state *crtc_state,
                                         const struct intel_link_m_n *m_n,
                                         const struct intel_link_m_n *m2_n2)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;
        enum transcoder transcoder = crtc_state->cpu_transcoder;

        if (DISPLAY_VER(dev_priv) >= 5) {
                intel_de_write(dev_priv, PIPE_DATA_M1(transcoder),
                               TU_SIZE(m_n->tu) | m_n->gmch_m);
                intel_de_write(dev_priv, PIPE_DATA_N1(transcoder),
                               m_n->gmch_n);
                intel_de_write(dev_priv, PIPE_LINK_M1(transcoder),
                               m_n->link_m);
                intel_de_write(dev_priv, PIPE_LINK_N1(transcoder),
                               m_n->link_n);
                /*
                 *  M2_N2 registers are set only if DRRS is supported
                 * (to make sure the registers are not unnecessarily accessed).
                 */
                if (m2_n2 && crtc_state->has_drrs &&
                    transcoder_has_m2_n2(dev_priv, transcoder)) {
                        intel_de_write(dev_priv, PIPE_DATA_M2(transcoder),
                                       TU_SIZE(m2_n2->tu) | m2_n2->gmch_m);
                        intel_de_write(dev_priv, PIPE_DATA_N2(transcoder),
                                       m2_n2->gmch_n);
                        intel_de_write(dev_priv, PIPE_LINK_M2(transcoder),
                                       m2_n2->link_m);
                        intel_de_write(dev_priv, PIPE_LINK_N2(transcoder),
                                       m2_n2->link_n);
                }
        } else {
                intel_de_write(dev_priv, PIPE_DATA_M_G4X(pipe),
                               TU_SIZE(m_n->tu) | m_n->gmch_m);
                intel_de_write(dev_priv, PIPE_DATA_N_G4X(pipe), m_n->gmch_n);
                intel_de_write(dev_priv, PIPE_LINK_M_G4X(pipe), m_n->link_m);
                intel_de_write(dev_priv, PIPE_LINK_N_G4X(pipe), m_n->link_n);
        }
}

void intel_dp_set_m_n(const struct intel_crtc_state *crtc_state, enum link_m_n_set m_n)
{
        const struct intel_link_m_n *dp_m_n, *dp_m2_n2 = NULL;
        struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);

        if (m_n == M1_N1) {
                dp_m_n = &crtc_state->dp_m_n;
                dp_m2_n2 = &crtc_state->dp_m2_n2;
        } else if (m_n == M2_N2) {

                /*
                 * M2_N2 registers are not supported. Hence m2_n2 divider value
                 * needs to be programmed into M1_N1.
                 */
                dp_m_n = &crtc_state->dp_m2_n2;
        } else {
                drm_err(&i915->drm, "Unsupported divider value\n");
                return;
        }

        if (crtc_state->has_pch_encoder)
                intel_pch_transcoder_set_m_n(crtc_state, &crtc_state->dp_m_n);
        else
                intel_cpu_transcoder_set_m_n(crtc_state, dp_m_n, dp_m2_n2);
}

static void intel_set_transcoder_timings(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;
        enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
        const struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
        u32 crtc_vtotal, crtc_vblank_end;
        int vsyncshift = 0;

        /* We need to be careful not to changed the adjusted mode, for otherwise
         * the hw state checker will get angry at the mismatch. */
        crtc_vtotal = adjusted_mode->crtc_vtotal;
        crtc_vblank_end = adjusted_mode->crtc_vblank_end;

        if (adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE) {
                /* the chip adds 2 halflines automatically */
                crtc_vtotal -= 1;
                crtc_vblank_end -= 1;

                if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_SDVO))
                        vsyncshift = (adjusted_mode->crtc_htotal - 1) / 2;
                else
                        vsyncshift = adjusted_mode->crtc_hsync_start -
                                adjusted_mode->crtc_htotal / 2;
                if (vsyncshift < 0)
                        vsyncshift += adjusted_mode->crtc_htotal;
        }

        if (DISPLAY_VER(dev_priv) > 3)
                intel_de_write(dev_priv, VSYNCSHIFT(cpu_transcoder),
                               vsyncshift);

        intel_de_write(dev_priv, HTOTAL(cpu_transcoder),
                       (adjusted_mode->crtc_hdisplay - 1) | ((adjusted_mode->crtc_htotal - 1) << 16));
        intel_de_write(dev_priv, HBLANK(cpu_transcoder),
                       (adjusted_mode->crtc_hblank_start - 1) | ((adjusted_mode->crtc_hblank_end - 1) << 16));
        intel_de_write(dev_priv, HSYNC(cpu_transcoder),
                       (adjusted_mode->crtc_hsync_start - 1) | ((adjusted_mode->crtc_hsync_end - 1) << 16));

        intel_de_write(dev_priv, VTOTAL(cpu_transcoder),
                       (adjusted_mode->crtc_vdisplay - 1) | ((crtc_vtotal - 1) << 16));
        intel_de_write(dev_priv, VBLANK(cpu_transcoder),
                       (adjusted_mode->crtc_vblank_start - 1) | ((crtc_vblank_end - 1) << 16));
        intel_de_write(dev_priv, VSYNC(cpu_transcoder),
                       (adjusted_mode->crtc_vsync_start - 1) | ((adjusted_mode->crtc_vsync_end - 1) << 16));

        /* Workaround: when the EDP input selection is B, the VTOTAL_B must be
         * programmed with the VTOTAL_EDP value. Same for VTOTAL_C. This is
         * documented on the DDI_FUNC_CTL register description, EDP Input Select
         * bits. */
        if (IS_HASWELL(dev_priv) && cpu_transcoder == TRANSCODER_EDP &&
            (pipe == PIPE_B || pipe == PIPE_C))
                intel_de_write(dev_priv, VTOTAL(pipe),
                               intel_de_read(dev_priv, VTOTAL(cpu_transcoder)));

}

static void intel_set_pipe_src_size(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;

        /* pipesrc controls the size that is scaled from, which should
         * always be the user's requested size.
         */
        intel_de_write(dev_priv, PIPESRC(pipe),
                       ((crtc_state->pipe_src_w - 1) << 16) | (crtc_state->pipe_src_h - 1));
}

static bool intel_pipe_is_interlaced(const struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
        enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;

        if (DISPLAY_VER(dev_priv) == 2)
                return false;

        if (DISPLAY_VER(dev_priv) >= 9 ||
            IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv))
                return intel_de_read(dev_priv, PIPECONF(cpu_transcoder)) & PIPECONF_INTERLACE_MASK_HSW;
        else
                return intel_de_read(dev_priv, PIPECONF(cpu_transcoder)) & PIPECONF_INTERLACE_MASK;
}

static void intel_get_transcoder_timings(struct intel_crtc *crtc,
                                         struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum transcoder cpu_transcoder = pipe_config->cpu_transcoder;
        u32 tmp;

        tmp = intel_de_read(dev_priv, HTOTAL(cpu_transcoder));
        pipe_config->hw.adjusted_mode.crtc_hdisplay = (tmp & 0xffff) + 1;
        pipe_config->hw.adjusted_mode.crtc_htotal = ((tmp >> 16) & 0xffff) + 1;

        if (!transcoder_is_dsi(cpu_transcoder)) {
                tmp = intel_de_read(dev_priv, HBLANK(cpu_transcoder));
                pipe_config->hw.adjusted_mode.crtc_hblank_start =
                                                        (tmp & 0xffff) + 1;
                pipe_config->hw.adjusted_mode.crtc_hblank_end =
                                                ((tmp >> 16) & 0xffff) + 1;
        }
        tmp = intel_de_read(dev_priv, HSYNC(cpu_transcoder));
        pipe_config->hw.adjusted_mode.crtc_hsync_start = (tmp & 0xffff) + 1;
        pipe_config->hw.adjusted_mode.crtc_hsync_end = ((tmp >> 16) & 0xffff) + 1;

        tmp = intel_de_read(dev_priv, VTOTAL(cpu_transcoder));
        pipe_config->hw.adjusted_mode.crtc_vdisplay = (tmp & 0xffff) + 1;
        pipe_config->hw.adjusted_mode.crtc_vtotal = ((tmp >> 16) & 0xffff) + 1;

        if (!transcoder_is_dsi(cpu_transcoder)) {
                tmp = intel_de_read(dev_priv, VBLANK(cpu_transcoder));
                pipe_config->hw.adjusted_mode.crtc_vblank_start =
                                                        (tmp & 0xffff) + 1;
                pipe_config->hw.adjusted_mode.crtc_vblank_end =
                                                ((tmp >> 16) & 0xffff) + 1;
        }
        tmp = intel_de_read(dev_priv, VSYNC(cpu_transcoder));
        pipe_config->hw.adjusted_mode.crtc_vsync_start = (tmp & 0xffff) + 1;
        pipe_config->hw.adjusted_mode.crtc_vsync_end = ((tmp >> 16) & 0xffff) + 1;

        if (intel_pipe_is_interlaced(pipe_config)) {
                pipe_config->hw.adjusted_mode.flags |= DRM_MODE_FLAG_INTERLACE;
                pipe_config->hw.adjusted_mode.crtc_vtotal += 1;
                pipe_config->hw.adjusted_mode.crtc_vblank_end += 1;
        }
}

static void intel_get_pipe_src_size(struct intel_crtc *crtc,
                                    struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        u32 tmp;

        tmp = intel_de_read(dev_priv, PIPESRC(crtc->pipe));
        pipe_config->pipe_src_h = (tmp & 0xffff) + 1;
        pipe_config->pipe_src_w = ((tmp >> 16) & 0xffff) + 1;
}

static void i9xx_set_pipeconf(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        u32 pipeconf;

        pipeconf = 0;

        /* we keep both pipes enabled on 830 */
        if (IS_I830(dev_priv))
                pipeconf |= intel_de_read(dev_priv, PIPECONF(crtc->pipe)) & PIPECONF_ENABLE;

        if (crtc_state->double_wide)
                pipeconf |= PIPECONF_DOUBLE_WIDE;

        /* only g4x and later have fancy bpc/dither controls */
        if (IS_G4X(dev_priv) || IS_VALLEYVIEW(dev_priv) ||
            IS_CHERRYVIEW(dev_priv)) {
                /* Bspec claims that we can't use dithering for 30bpp pipes. */
                if (crtc_state->dither && crtc_state->pipe_bpp != 30)
                        pipeconf |= PIPECONF_DITHER_EN |
                                    PIPECONF_DITHER_TYPE_SP;

                switch (crtc_state->pipe_bpp) {
                case 18:
                        pipeconf |= PIPECONF_6BPC;
                        break;
                case 24:
                        pipeconf |= PIPECONF_8BPC;
                        break;
                case 30:
                        pipeconf |= PIPECONF_10BPC;
                        break;
                default:
                        /* Case prevented by intel_choose_pipe_bpp_dither. */
                        BUG();
                }
        }

        if (crtc_state->hw.adjusted_mode.flags & DRM_MODE_FLAG_INTERLACE) {
                if (DISPLAY_VER(dev_priv) < 4 ||
                    intel_crtc_has_type(crtc_state, INTEL_OUTPUT_SDVO))
                        pipeconf |= PIPECONF_INTERLACE_W_FIELD_INDICATION;
                else
                        pipeconf |= PIPECONF_INTERLACE_W_SYNC_SHIFT;
        } else {
                pipeconf |= PIPECONF_PROGRESSIVE;
        }

        if ((IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) &&
             crtc_state->limited_color_range)
                pipeconf |= PIPECONF_COLOR_RANGE_SELECT;

        pipeconf |= PIPECONF_GAMMA_MODE(crtc_state->gamma_mode);

        pipeconf |= PIPECONF_FRAME_START_DELAY(dev_priv->framestart_delay - 1);

        intel_de_write(dev_priv, PIPECONF(crtc->pipe), pipeconf);
        intel_de_posting_read(dev_priv, PIPECONF(crtc->pipe));
}

static bool i9xx_has_pfit(struct drm_i915_private *dev_priv)
{
        if (IS_I830(dev_priv))
                return false;

        return DISPLAY_VER(dev_priv) >= 4 ||
                IS_PINEVIEW(dev_priv) || IS_MOBILE(dev_priv);
}

static void i9xx_get_pfit_config(struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        u32 tmp;

        if (!i9xx_has_pfit(dev_priv))
                return;

        tmp = intel_de_read(dev_priv, PFIT_CONTROL);
        if (!(tmp & PFIT_ENABLE))
                return;

        /* Check whether the pfit is attached to our pipe. */
        if (DISPLAY_VER(dev_priv) < 4) {
                if (crtc->pipe != PIPE_B)
                        return;
        } else {
                if ((tmp & PFIT_PIPE_MASK) != (crtc->pipe << PFIT_PIPE_SHIFT))
                        return;
        }

        crtc_state->gmch_pfit.control = tmp;
        crtc_state->gmch_pfit.pgm_ratios =
                intel_de_read(dev_priv, PFIT_PGM_RATIOS);
}

static void vlv_crtc_clock_get(struct intel_crtc *crtc,
                               struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum pipe pipe = crtc->pipe;
        struct dpll clock;
        u32 mdiv;
        int refclk = 100000;

        /* In case of DSI, DPLL will not be used */
        if ((pipe_config->dpll_hw_state.dpll & DPLL_VCO_ENABLE) == 0)
                return;

        vlv_dpio_get(dev_priv);
        mdiv = vlv_dpio_read(dev_priv, pipe, VLV_PLL_DW3(pipe));
        vlv_dpio_put(dev_priv);

        clock.m1 = (mdiv >> DPIO_M1DIV_SHIFT) & 7;
        clock.m2 = mdiv & DPIO_M2DIV_MASK;
        clock.n = (mdiv >> DPIO_N_SHIFT) & 0xf;
        clock.p1 = (mdiv >> DPIO_P1_SHIFT) & 7;
        clock.p2 = (mdiv >> DPIO_P2_SHIFT) & 0x1f;

        pipe_config->port_clock = vlv_calc_dpll_params(refclk, &clock);
}

static void chv_crtc_clock_get(struct intel_crtc *crtc,
                               struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum pipe pipe = crtc->pipe;
        enum dpio_channel port = vlv_pipe_to_channel(pipe);
        struct dpll clock;
        u32 cmn_dw13, pll_dw0, pll_dw1, pll_dw2, pll_dw3;
        int refclk = 100000;

        /* In case of DSI, DPLL will not be used */
        if ((pipe_config->dpll_hw_state.dpll & DPLL_VCO_ENABLE) == 0)
                return;

        vlv_dpio_get(dev_priv);
        cmn_dw13 = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW13(port));
        pll_dw0 = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW0(port));
        pll_dw1 = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW1(port));
        pll_dw2 = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW2(port));
        pll_dw3 = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW3(port));
        vlv_dpio_put(dev_priv);

        clock.m1 = (pll_dw1 & 0x7) == DPIO_CHV_M1_DIV_BY_2 ? 2 : 0;
        clock.m2 = (pll_dw0 & 0xff) << 22;
        if (pll_dw3 & DPIO_CHV_FRAC_DIV_EN)
                clock.m2 |= pll_dw2 & 0x3fffff;
        clock.n = (pll_dw1 >> DPIO_CHV_N_DIV_SHIFT) & 0xf;
        clock.p1 = (cmn_dw13 >> DPIO_CHV_P1_DIV_SHIFT) & 0x7;
        clock.p2 = (cmn_dw13 >> DPIO_CHV_P2_DIV_SHIFT) & 0x1f;

        pipe_config->port_clock = chv_calc_dpll_params(refclk, &clock);
}

static enum intel_output_format
bdw_get_pipemisc_output_format(struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        u32 tmp;

        tmp = intel_de_read(dev_priv, PIPEMISC(crtc->pipe));

        if (tmp & PIPEMISC_YUV420_ENABLE) {
                /* We support 4:2:0 in full blend mode only */
                drm_WARN_ON(&dev_priv->drm,
                            (tmp & PIPEMISC_YUV420_MODE_FULL_BLEND) == 0);

                return INTEL_OUTPUT_FORMAT_YCBCR420;
        } else if (tmp & PIPEMISC_OUTPUT_COLORSPACE_YUV) {
                return INTEL_OUTPUT_FORMAT_YCBCR444;
        } else {
                return INTEL_OUTPUT_FORMAT_RGB;
        }
}

static void i9xx_get_pipe_color_config(struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct intel_plane *plane = to_intel_plane(crtc->base.primary);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum i9xx_plane_id i9xx_plane = plane->i9xx_plane;
        u32 tmp;

        tmp = intel_de_read(dev_priv, DSPCNTR(i9xx_plane));

        if (tmp & DISPPLANE_GAMMA_ENABLE)
                crtc_state->gamma_enable = true;

        if (!HAS_GMCH(dev_priv) &&
            tmp & DISPPLANE_PIPE_CSC_ENABLE)
                crtc_state->csc_enable = true;
}

static bool i9xx_get_pipe_config(struct intel_crtc *crtc,
                                 struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum intel_display_power_domain power_domain;
        intel_wakeref_t wakeref;
        u32 tmp;
        bool ret;

        power_domain = POWER_DOMAIN_PIPE(crtc->pipe);
        wakeref = intel_display_power_get_if_enabled(dev_priv, power_domain);
        if (!wakeref)
                return false;

        pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
        pipe_config->cpu_transcoder = (enum transcoder) crtc->pipe;
        pipe_config->shared_dpll = NULL;

        ret = false;

        tmp = intel_de_read(dev_priv, PIPECONF(crtc->pipe));
        if (!(tmp & PIPECONF_ENABLE))
                goto out;

        if (IS_G4X(dev_priv) || IS_VALLEYVIEW(dev_priv) ||
            IS_CHERRYVIEW(dev_priv)) {
                switch (tmp & PIPECONF_BPC_MASK) {
                case PIPECONF_6BPC:
                        pipe_config->pipe_bpp = 18;
                        break;
                case PIPECONF_8BPC:
                        pipe_config->pipe_bpp = 24;
                        break;
                case PIPECONF_10BPC:
                        pipe_config->pipe_bpp = 30;
                        break;
                default:
                        break;
                }
        }

        if ((IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) &&
            (tmp & PIPECONF_COLOR_RANGE_SELECT))
                pipe_config->limited_color_range = true;

        pipe_config->gamma_mode = (tmp & PIPECONF_GAMMA_MODE_MASK_I9XX) >>
                PIPECONF_GAMMA_MODE_SHIFT;

        if (IS_CHERRYVIEW(dev_priv))
                pipe_config->cgm_mode = intel_de_read(dev_priv,
                                                      CGM_PIPE_MODE(crtc->pipe));

        i9xx_get_pipe_color_config(pipe_config);
        intel_color_get_config(pipe_config);

        if (DISPLAY_VER(dev_priv) < 4)
                pipe_config->double_wide = tmp & PIPECONF_DOUBLE_WIDE;

        intel_get_transcoder_timings(crtc, pipe_config);
        intel_get_pipe_src_size(crtc, pipe_config);

        i9xx_get_pfit_config(pipe_config);

        if (DISPLAY_VER(dev_priv) >= 4) {
                /* No way to read it out on pipes B and C */
                if (IS_CHERRYVIEW(dev_priv) && crtc->pipe != PIPE_A)
                        tmp = dev_priv->chv_dpll_md[crtc->pipe];
                else
                        tmp = intel_de_read(dev_priv, DPLL_MD(crtc->pipe));
                pipe_config->pixel_multiplier =
                        ((tmp & DPLL_MD_UDI_MULTIPLIER_MASK)
                         >> DPLL_MD_UDI_MULTIPLIER_SHIFT) + 1;
                pipe_config->dpll_hw_state.dpll_md = tmp;
        } else if (IS_I945G(dev_priv) || IS_I945GM(dev_priv) ||
                   IS_G33(dev_priv) || IS_PINEVIEW(dev_priv)) {
                tmp = intel_de_read(dev_priv, DPLL(crtc->pipe));
                pipe_config->pixel_multiplier =
                        ((tmp & SDVO_MULTIPLIER_MASK)
                         >> SDVO_MULTIPLIER_SHIFT_HIRES) + 1;
        } else {
                /* Note that on i915G/GM the pixel multiplier is in the sdvo
                 * port and will be fixed up in the encoder->get_config
                 * function. */
                pipe_config->pixel_multiplier = 1;
        }
        pipe_config->dpll_hw_state.dpll = intel_de_read(dev_priv,
                                                        DPLL(crtc->pipe));
        if (!IS_VALLEYVIEW(dev_priv) && !IS_CHERRYVIEW(dev_priv)) {
                pipe_config->dpll_hw_state.fp0 = intel_de_read(dev_priv,
                                                               FP0(crtc->pipe));
                pipe_config->dpll_hw_state.fp1 = intel_de_read(dev_priv,
                                                               FP1(crtc->pipe));
        } else {
                /* Mask out read-only status bits. */
                pipe_config->dpll_hw_state.dpll &= ~(DPLL_LOCK_VLV |
                                                     DPLL_PORTC_READY_MASK |
                                                     DPLL_PORTB_READY_MASK);
        }

        if (IS_CHERRYVIEW(dev_priv))
                chv_crtc_clock_get(crtc, pipe_config);
        else if (IS_VALLEYVIEW(dev_priv))
                vlv_crtc_clock_get(crtc, pipe_config);
        else
                i9xx_crtc_clock_get(crtc, pipe_config);

        /*
         * Normally the dotclock is filled in by the encoder .get_config()
         * but in case the pipe is enabled w/o any ports we need a sane
         * default.
         */
        pipe_config->hw.adjusted_mode.crtc_clock =
                pipe_config->port_clock / pipe_config->pixel_multiplier;

        ret = true;

out:
        intel_display_power_put(dev_priv, power_domain, wakeref);

        return ret;
}

static void ilk_init_pch_refclk(struct drm_i915_private *dev_priv)
{
        struct intel_encoder *encoder;
        int i;
        u32 val, final;
        bool has_lvds = false;
        bool has_cpu_edp = false;
        bool has_panel = false;
        bool has_ck505 = false;
        bool can_ssc = false;
        bool using_ssc_source = false;

        /* We need to take the global config into account */
        for_each_intel_encoder(&dev_priv->drm, encoder) {
                switch (encoder->type) {
                case INTEL_OUTPUT_LVDS:
                        has_panel = true;
                        has_lvds = true;
                        break;
                case INTEL_OUTPUT_EDP:
                        has_panel = true;
                        if (encoder->port == PORT_A)
                                has_cpu_edp = true;
                        break;
                default:
                        break;
                }
        }

        if (HAS_PCH_IBX(dev_priv)) {
                has_ck505 = dev_priv->vbt.display_clock_mode;
                can_ssc = has_ck505;
        } else {
                has_ck505 = false;
                can_ssc = true;
        }

        /* Check if any DPLLs are using the SSC source */
        for (i = 0; i < dev_priv->dpll.num_shared_dpll; i++) {
                u32 temp = intel_de_read(dev_priv, PCH_DPLL(i));

                if (!(temp & DPLL_VCO_ENABLE))
                        continue;

                if ((temp & PLL_REF_INPUT_MASK) ==
                    PLLB_REF_INPUT_SPREADSPECTRUMIN) {
                        using_ssc_source = true;
                        break;
                }
        }

        drm_dbg_kms(&dev_priv->drm,
                    "has_panel %d has_lvds %d has_ck505 %d using_ssc_source %d\n",
                    has_panel, has_lvds, has_ck505, using_ssc_source);

        /* Ironlake: try to setup display ref clock before DPLL
         * enabling. This is only under driver's control after
         * PCH B stepping, previous chipset stepping should be
         * ignoring this setting.
         */
        val = intel_de_read(dev_priv, PCH_DREF_CONTROL);

        /* As we must carefully and slowly disable/enable each source in turn,
         * compute the final state we want first and check if we need to
         * make any changes at all.
         */
        final = val;
        final &= ~DREF_NONSPREAD_SOURCE_MASK;
        if (has_ck505)
                final |= DREF_NONSPREAD_CK505_ENABLE;
        else
                final |= DREF_NONSPREAD_SOURCE_ENABLE;

        final &= ~DREF_SSC_SOURCE_MASK;
        final &= ~DREF_CPU_SOURCE_OUTPUT_MASK;
        final &= ~DREF_SSC1_ENABLE;

        if (has_panel) {
                final |= DREF_SSC_SOURCE_ENABLE;

                if (intel_panel_use_ssc(dev_priv) && can_ssc)
                        final |= DREF_SSC1_ENABLE;

                if (has_cpu_edp) {
                        if (intel_panel_use_ssc(dev_priv) && can_ssc)
                                final |= DREF_CPU_SOURCE_OUTPUT_DOWNSPREAD;
                        else
                                final |= DREF_CPU_SOURCE_OUTPUT_NONSPREAD;
                } else
                        final |= DREF_CPU_SOURCE_OUTPUT_DISABLE;
        } else if (using_ssc_source) {
                final |= DREF_SSC_SOURCE_ENABLE;
                final |= DREF_SSC1_ENABLE;
        }

        if (final == val)
                return;

        /* Always enable nonspread source */
        val &= ~DREF_NONSPREAD_SOURCE_MASK;

        if (has_ck505)
                val |= DREF_NONSPREAD_CK505_ENABLE;
        else
                val |= DREF_NONSPREAD_SOURCE_ENABLE;

        if (has_panel) {
                val &= ~DREF_SSC_SOURCE_MASK;
                val |= DREF_SSC_SOURCE_ENABLE;

                /* SSC must be turned on before enabling the CPU output  */
                if (intel_panel_use_ssc(dev_priv) && can_ssc) {
                        drm_dbg_kms(&dev_priv->drm, "Using SSC on panel\n");
                        val |= DREF_SSC1_ENABLE;
                } else
                        val &= ~DREF_SSC1_ENABLE;

                /* Get SSC going before enabling the outputs */
                intel_de_write(dev_priv, PCH_DREF_CONTROL, val);
                intel_de_posting_read(dev_priv, PCH_DREF_CONTROL);
                udelay(200);

                val &= ~DREF_CPU_SOURCE_OUTPUT_MASK;

                /* Enable CPU source on CPU attached eDP */
                if (has_cpu_edp) {
                        if (intel_panel_use_ssc(dev_priv) && can_ssc) {
                                drm_dbg_kms(&dev_priv->drm,
                                            "Using SSC on eDP\n");
                                val |= DREF_CPU_SOURCE_OUTPUT_DOWNSPREAD;
                        } else
                                val |= DREF_CPU_SOURCE_OUTPUT_NONSPREAD;
                } else
                        val |= DREF_CPU_SOURCE_OUTPUT_DISABLE;

                intel_de_write(dev_priv, PCH_DREF_CONTROL, val);
                intel_de_posting_read(dev_priv, PCH_DREF_CONTROL);
                udelay(200);
        } else {
                drm_dbg_kms(&dev_priv->drm, "Disabling CPU source output\n");

                val &= ~DREF_CPU_SOURCE_OUTPUT_MASK;

                /* Turn off CPU output */
                val |= DREF_CPU_SOURCE_OUTPUT_DISABLE;

                intel_de_write(dev_priv, PCH_DREF_CONTROL, val);
                intel_de_posting_read(dev_priv, PCH_DREF_CONTROL);
                udelay(200);

                if (!using_ssc_source) {
                        drm_dbg_kms(&dev_priv->drm, "Disabling SSC source\n");

                        /* Turn off the SSC source */
                        val &= ~DREF_SSC_SOURCE_MASK;
                        val |= DREF_SSC_SOURCE_DISABLE;

                        /* Turn off SSC1 */
                        val &= ~DREF_SSC1_ENABLE;

                        intel_de_write(dev_priv, PCH_DREF_CONTROL, val);
                        intel_de_posting_read(dev_priv, PCH_DREF_CONTROL);
                        udelay(200);
                }
        }

        BUG_ON(val != final);
}

static void lpt_reset_fdi_mphy(struct drm_i915_private *dev_priv)
{
        u32 tmp;

        tmp = intel_de_read(dev_priv, SOUTH_CHICKEN2);
        tmp |= FDI_MPHY_IOSFSB_RESET_CTL;
        intel_de_write(dev_priv, SOUTH_CHICKEN2, tmp);

        if (wait_for_us(intel_de_read(dev_priv, SOUTH_CHICKEN2) &
                        FDI_MPHY_IOSFSB_RESET_STATUS, 100))
                drm_err(&dev_priv->drm, "FDI mPHY reset assert timeout\n");

        tmp = intel_de_read(dev_priv, SOUTH_CHICKEN2);
        tmp &= ~FDI_MPHY_IOSFSB_RESET_CTL;
        intel_de_write(dev_priv, SOUTH_CHICKEN2, tmp);

        if (wait_for_us((intel_de_read(dev_priv, SOUTH_CHICKEN2) &
                         FDI_MPHY_IOSFSB_RESET_STATUS) == 0, 100))
                drm_err(&dev_priv->drm, "FDI mPHY reset de-assert timeout\n");
}

/* WaMPhyProgramming:hsw */
static void lpt_program_fdi_mphy(struct drm_i915_private *dev_priv)
{
        u32 tmp;

        tmp = intel_sbi_read(dev_priv, 0x8008, SBI_MPHY);
        tmp &= ~(0xFF << 24);
        tmp |= (0x12 << 24);
        intel_sbi_write(dev_priv, 0x8008, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x2008, SBI_MPHY);
        tmp |= (1 << 11);
        intel_sbi_write(dev_priv, 0x2008, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x2108, SBI_MPHY);
        tmp |= (1 << 11);
        intel_sbi_write(dev_priv, 0x2108, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x206C, SBI_MPHY);
        tmp |= (1 << 24) | (1 << 21) | (1 << 18);
        intel_sbi_write(dev_priv, 0x206C, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x216C, SBI_MPHY);
        tmp |= (1 << 24) | (1 << 21) | (1 << 18);
        intel_sbi_write(dev_priv, 0x216C, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x2080, SBI_MPHY);
        tmp &= ~(7 << 13);
        tmp |= (5 << 13);
        intel_sbi_write(dev_priv, 0x2080, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x2180, SBI_MPHY);
        tmp &= ~(7 << 13);
        tmp |= (5 << 13);
        intel_sbi_write(dev_priv, 0x2180, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x208C, SBI_MPHY);
        tmp &= ~0xFF;
        tmp |= 0x1C;
        intel_sbi_write(dev_priv, 0x208C, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x218C, SBI_MPHY);
        tmp &= ~0xFF;
        tmp |= 0x1C;
        intel_sbi_write(dev_priv, 0x218C, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x2098, SBI_MPHY);
        tmp &= ~(0xFF << 16);
        tmp |= (0x1C << 16);
        intel_sbi_write(dev_priv, 0x2098, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x2198, SBI_MPHY);
        tmp &= ~(0xFF << 16);
        tmp |= (0x1C << 16);
        intel_sbi_write(dev_priv, 0x2198, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x20C4, SBI_MPHY);
        tmp |= (1 << 27);
        intel_sbi_write(dev_priv, 0x20C4, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x21C4, SBI_MPHY);
        tmp |= (1 << 27);
        intel_sbi_write(dev_priv, 0x21C4, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x20EC, SBI_MPHY);
        tmp &= ~(0xF << 28);
        tmp |= (4 << 28);
        intel_sbi_write(dev_priv, 0x20EC, tmp, SBI_MPHY);

        tmp = intel_sbi_read(dev_priv, 0x21EC, SBI_MPHY);
        tmp &= ~(0xF << 28);
        tmp |= (4 << 28);
        intel_sbi_write(dev_priv, 0x21EC, tmp, SBI_MPHY);
}

/* Implements 3 different sequences from BSpec chapter "Display iCLK
 * Programming" based on the parameters passed:
 * - Sequence to enable CLKOUT_DP
 * - Sequence to enable CLKOUT_DP without spread
 * - Sequence to enable CLKOUT_DP for FDI usage and configure PCH FDI I/O
 */
static void lpt_enable_clkout_dp(struct drm_i915_private *dev_priv,
                                 bool with_spread, bool with_fdi)
{
        u32 reg, tmp;

        if (drm_WARN(&dev_priv->drm, with_fdi && !with_spread,
                     "FDI requires downspread\n"))
                with_spread = true;
        if (drm_WARN(&dev_priv->drm, HAS_PCH_LPT_LP(dev_priv) &&
                     with_fdi, "LP PCH doesn't have FDI\n"))
                with_fdi = false;

        mutex_lock(&dev_priv->sb_lock);

        tmp = intel_sbi_read(dev_priv, SBI_SSCCTL, SBI_ICLK);
        tmp &= ~SBI_SSCCTL_DISABLE;
        tmp |= SBI_SSCCTL_PATHALT;
        intel_sbi_write(dev_priv, SBI_SSCCTL, tmp, SBI_ICLK);

        udelay(24);

        if (with_spread) {
                tmp = intel_sbi_read(dev_priv, SBI_SSCCTL, SBI_ICLK);
                tmp &= ~SBI_SSCCTL_PATHALT;
                intel_sbi_write(dev_priv, SBI_SSCCTL, tmp, SBI_ICLK);

                if (with_fdi) {
                        lpt_reset_fdi_mphy(dev_priv);
                        lpt_program_fdi_mphy(dev_priv);
                }
        }

        reg = HAS_PCH_LPT_LP(dev_priv) ? SBI_GEN0 : SBI_DBUFF0;
        tmp = intel_sbi_read(dev_priv, reg, SBI_ICLK);
        tmp |= SBI_GEN0_CFG_BUFFENABLE_DISABLE;
        intel_sbi_write(dev_priv, reg, tmp, SBI_ICLK);

        mutex_unlock(&dev_priv->sb_lock);
}

/* Sequence to disable CLKOUT_DP */
void lpt_disable_clkout_dp(struct drm_i915_private *dev_priv)
{
        u32 reg, tmp;

        mutex_lock(&dev_priv->sb_lock);

        reg = HAS_PCH_LPT_LP(dev_priv) ? SBI_GEN0 : SBI_DBUFF0;
        tmp = intel_sbi_read(dev_priv, reg, SBI_ICLK);
        tmp &= ~SBI_GEN0_CFG_BUFFENABLE_DISABLE;
        intel_sbi_write(dev_priv, reg, tmp, SBI_ICLK);

        tmp = intel_sbi_read(dev_priv, SBI_SSCCTL, SBI_ICLK);
        if (!(tmp & SBI_SSCCTL_DISABLE)) {
                if (!(tmp & SBI_SSCCTL_PATHALT)) {
                        tmp |= SBI_SSCCTL_PATHALT;
                        intel_sbi_write(dev_priv, SBI_SSCCTL, tmp, SBI_ICLK);
                        udelay(32);
                }
                tmp |= SBI_SSCCTL_DISABLE;
                intel_sbi_write(dev_priv, SBI_SSCCTL, tmp, SBI_ICLK);
        }

        mutex_unlock(&dev_priv->sb_lock);
}

#define BEND_IDX(steps) ((50 + (steps)) / 5)

static const u16 sscdivintphase[] = {
        [BEND_IDX( 50)] = 0x3B23,
        [BEND_IDX( 45)] = 0x3B23,
        [BEND_IDX( 40)] = 0x3C23,
        [BEND_IDX( 35)] = 0x3C23,
        [BEND_IDX( 30)] = 0x3D23,
        [BEND_IDX( 25)] = 0x3D23,
        [BEND_IDX( 20)] = 0x3E23,
        [BEND_IDX( 15)] = 0x3E23,
        [BEND_IDX( 10)] = 0x3F23,
        [BEND_IDX(  5)] = 0x3F23,
        [BEND_IDX(  0)] = 0x0025,
        [BEND_IDX( -5)] = 0x0025,
        [BEND_IDX(-10)] = 0x0125,
        [BEND_IDX(-15)] = 0x0125,
        [BEND_IDX(-20)] = 0x0225,
        [BEND_IDX(-25)] = 0x0225,
        [BEND_IDX(-30)] = 0x0325,
        [BEND_IDX(-35)] = 0x0325,
        [BEND_IDX(-40)] = 0x0425,
        [BEND_IDX(-45)] = 0x0425,
        [BEND_IDX(-50)] = 0x0525,
};

/*
 * Bend CLKOUT_DP
 * steps -50 to 50 inclusive, in steps of 5
 * < 0 slow down the clock, > 0 speed up the clock, 0 == no bend (135MHz)
 * change in clock period = -(steps / 10) * 5.787 ps
 */
static void lpt_bend_clkout_dp(struct drm_i915_private *dev_priv, int steps)
{
        u32 tmp;
        int idx = BEND_IDX(steps);

        if (drm_WARN_ON(&dev_priv->drm, steps % 5 != 0))
                return;

        if (drm_WARN_ON(&dev_priv->drm, idx >= ARRAY_SIZE(sscdivintphase)))
                return;

        mutex_lock(&dev_priv->sb_lock);

        if (steps % 10 != 0)
                tmp = 0xAAAAAAAB;
        else
                tmp = 0x00000000;
        intel_sbi_write(dev_priv, SBI_SSCDITHPHASE, tmp, SBI_ICLK);

        tmp = intel_sbi_read(dev_priv, SBI_SSCDIVINTPHASE, SBI_ICLK);
        tmp &= 0xffff0000;
        tmp |= sscdivintphase[idx];
        intel_sbi_write(dev_priv, SBI_SSCDIVINTPHASE, tmp, SBI_ICLK);

        mutex_unlock(&dev_priv->sb_lock);
}

#undef BEND_IDX

static bool spll_uses_pch_ssc(struct drm_i915_private *dev_priv)
{
        u32 fuse_strap = intel_de_read(dev_priv, FUSE_STRAP);
        u32 ctl = intel_de_read(dev_priv, SPLL_CTL);

        if ((ctl & SPLL_PLL_ENABLE) == 0)
                return false;

        if ((ctl & SPLL_REF_MASK) == SPLL_REF_MUXED_SSC &&
            (fuse_strap & HSW_CPU_SSC_ENABLE) == 0)
                return true;

        if (IS_BROADWELL(dev_priv) &&
            (ctl & SPLL_REF_MASK) == SPLL_REF_PCH_SSC_BDW)
                return true;

        return false;
}

static bool wrpll_uses_pch_ssc(struct drm_i915_private *dev_priv,
                               enum intel_dpll_id id)
{
        u32 fuse_strap = intel_de_read(dev_priv, FUSE_STRAP);
        u32 ctl = intel_de_read(dev_priv, WRPLL_CTL(id));

        if ((ctl & WRPLL_PLL_ENABLE) == 0)
                return false;

        if ((ctl & WRPLL_REF_MASK) == WRPLL_REF_PCH_SSC)
                return true;

        if ((IS_BROADWELL(dev_priv) || IS_HSW_ULT(dev_priv)) &&
            (ctl & WRPLL_REF_MASK) == WRPLL_REF_MUXED_SSC_BDW &&
            (fuse_strap & HSW_CPU_SSC_ENABLE) == 0)
                return true;

        return false;
}

static void lpt_init_pch_refclk(struct drm_i915_private *dev_priv)
{
        struct intel_encoder *encoder;
        bool has_fdi = false;

        for_each_intel_encoder(&dev_priv->drm, encoder) {
                switch (encoder->type) {
                case INTEL_OUTPUT_ANALOG:
                        has_fdi = true;
                        break;
                default:
                        break;
                }
        }

        /*
         * The BIOS may have decided to use the PCH SSC
         * reference so we must not disable it until the
         * relevant PLLs have stopped relying on it. We'll
         * just leave the PCH SSC reference enabled in case
         * any active PLL is using it. It will get disabled
         * after runtime suspend if we don't have FDI.
         *
         * TODO: Move the whole reference clock handling
         * to the modeset sequence proper so that we can
         * actually enable/disable/reconfigure these things
         * safely. To do that we need to introduce a real
         * clock hierarchy. That would also allow us to do
         * clock bending finally.
         */
        dev_priv->pch_ssc_use = 0;

        if (spll_uses_pch_ssc(dev_priv)) {
                drm_dbg_kms(&dev_priv->drm, "SPLL using PCH SSC\n");
                dev_priv->pch_ssc_use |= BIT(DPLL_ID_SPLL);
        }

        if (wrpll_uses_pch_ssc(dev_priv, DPLL_ID_WRPLL1)) {
                drm_dbg_kms(&dev_priv->drm, "WRPLL1 using PCH SSC\n");
                dev_priv->pch_ssc_use |= BIT(DPLL_ID_WRPLL1);
        }

        if (wrpll_uses_pch_ssc(dev_priv, DPLL_ID_WRPLL2)) {
                drm_dbg_kms(&dev_priv->drm, "WRPLL2 using PCH SSC\n");
                dev_priv->pch_ssc_use |= BIT(DPLL_ID_WRPLL2);
        }

        if (dev_priv->pch_ssc_use)
                return;

        if (has_fdi) {
                lpt_bend_clkout_dp(dev_priv, 0);
                lpt_enable_clkout_dp(dev_priv, true, true);
        } else {
                lpt_disable_clkout_dp(dev_priv);
        }
}

/*
 * Initialize reference clocks when the driver loads
 */
void intel_init_pch_refclk(struct drm_i915_private *dev_priv)
{
        if (HAS_PCH_IBX(dev_priv) || HAS_PCH_CPT(dev_priv))
                ilk_init_pch_refclk(dev_priv);
        else if (HAS_PCH_LPT(dev_priv))
                lpt_init_pch_refclk(dev_priv);
}

static void ilk_set_pipeconf(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;
        u32 val;

        val = 0;

        switch (crtc_state->pipe_bpp) {
        case 18:
                val |= PIPECONF_6BPC;
                break;
        case 24:
                val |= PIPECONF_8BPC;
                break;
        case 30:
                val |= PIPECONF_10BPC;
                break;
        case 36:
                val |= PIPECONF_12BPC;
                break;
        default:
                /* Case prevented by intel_choose_pipe_bpp_dither. */
                BUG();
        }

        if (crtc_state->dither)
                val |= (PIPECONF_DITHER_EN | PIPECONF_DITHER_TYPE_SP);

        if (crtc_state->hw.adjusted_mode.flags & DRM_MODE_FLAG_INTERLACE)
                val |= PIPECONF_INTERLACED_ILK;
        else
                val |= PIPECONF_PROGRESSIVE;

        /*
         * This would end up with an odd purple hue over
         * the entire display. Make sure we don't do it.
         */
        drm_WARN_ON(&dev_priv->drm, crtc_state->limited_color_range &&
                    crtc_state->output_format != INTEL_OUTPUT_FORMAT_RGB);

        if (crtc_state->limited_color_range &&
            !intel_crtc_has_type(crtc_state, INTEL_OUTPUT_SDVO))
                val |= PIPECONF_COLOR_RANGE_SELECT;

        if (crtc_state->output_format != INTEL_OUTPUT_FORMAT_RGB)
                val |= PIPECONF_OUTPUT_COLORSPACE_YUV709;

        val |= PIPECONF_GAMMA_MODE(crtc_state->gamma_mode);

        val |= PIPECONF_FRAME_START_DELAY(dev_priv->framestart_delay - 1);

        intel_de_write(dev_priv, PIPECONF(pipe), val);
        intel_de_posting_read(dev_priv, PIPECONF(pipe));
}

static void hsw_set_pipeconf(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
        u32 val = 0;

        if (IS_HASWELL(dev_priv) && crtc_state->dither)
                val |= (PIPECONF_DITHER_EN | PIPECONF_DITHER_TYPE_SP);

        if (crtc_state->hw.adjusted_mode.flags & DRM_MODE_FLAG_INTERLACE)
                val |= PIPECONF_INTERLACED_ILK;
        else
                val |= PIPECONF_PROGRESSIVE;

        if (IS_HASWELL(dev_priv) &&
            crtc_state->output_format != INTEL_OUTPUT_FORMAT_RGB)
                val |= PIPECONF_OUTPUT_COLORSPACE_YUV_HSW;

        intel_de_write(dev_priv, PIPECONF(cpu_transcoder), val);
        intel_de_posting_read(dev_priv, PIPECONF(cpu_transcoder));
}

static void bdw_set_pipemisc(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        const struct intel_crtc_scaler_state *scaler_state =
                &crtc_state->scaler_state;

        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        u32 val = 0;
        int i;

        switch (crtc_state->pipe_bpp) {
        case 18:
                val |= PIPEMISC_6_BPC;
                break;
        case 24:
                val |= PIPEMISC_8_BPC;
                break;
        case 30:
                val |= PIPEMISC_10_BPC;
                break;
        case 36:
                /* Port output 12BPC defined for ADLP+ */
                if (DISPLAY_VER(dev_priv) > 12)
                        val |= PIPEMISC_12_BPC_ADLP;
                break;
        default:
                MISSING_CASE(crtc_state->pipe_bpp);
                break;
        }

        if (crtc_state->dither)
                val |= PIPEMISC_DITHER_ENABLE | PIPEMISC_DITHER_TYPE_SP;

        if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420 ||
            crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR444)
                val |= PIPEMISC_OUTPUT_COLORSPACE_YUV;

        if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420)
                val |= PIPEMISC_YUV420_ENABLE |
                        PIPEMISC_YUV420_MODE_FULL_BLEND;

        if (DISPLAY_VER(dev_priv) >= 11 &&
            (crtc_state->active_planes & ~(icl_hdr_plane_mask() |
                                           BIT(PLANE_CURSOR))) == 0)
                val |= PIPEMISC_HDR_MODE_PRECISION;

        if (DISPLAY_VER(dev_priv) >= 12)
                val |= PIPEMISC_PIXEL_ROUNDING_TRUNC;

        if (IS_ALDERLAKE_P(dev_priv)) {
                bool scaler_in_use = false;

                for (i = 0; i < crtc->num_scalers; i++) {
                        if (!scaler_state->scalers[i].in_use)
                                continue;

                        scaler_in_use = true;
                        break;
                }

                intel_de_rmw(dev_priv, PIPE_MISC2(crtc->pipe),
                             PIPE_MISC2_UNDERRUN_BUBBLE_COUNTER_MASK,
                             scaler_in_use ? PIPE_MISC2_BUBBLE_COUNTER_SCALER_EN :
                             PIPE_MISC2_BUBBLE_COUNTER_SCALER_DIS);
        }

        intel_de_write(dev_priv, PIPEMISC(crtc->pipe), val);
}

int bdw_get_pipemisc_bpp(struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        u32 tmp;

        tmp = intel_de_read(dev_priv, PIPEMISC(crtc->pipe));

        switch (tmp & PIPEMISC_BPC_MASK) {
        case PIPEMISC_6_BPC:
                return 18;
        case PIPEMISC_8_BPC:
                return 24;
        case PIPEMISC_10_BPC:
                return 30;
        /*
         * PORT OUTPUT 12 BPC defined for ADLP+.
         *
         * TODO:
         * For previous platforms with DSI interface, bits 5:7
         * are used for storing pipe_bpp irrespective of dithering.
         * Since the value of 12 BPC is not defined for these bits
         * on older platforms, need to find a workaround for 12 BPC
         * MIPI DSI HW readout.
         */
        case PIPEMISC_12_BPC_ADLP:
                if (DISPLAY_VER(dev_priv) > 12)
                        return 36;
                fallthrough;
        default:
                MISSING_CASE(tmp);
                return 0;
        }
}

int ilk_get_lanes_required(int target_clock, int link_bw, int bpp)
{
        /*
         * Account for spread spectrum to avoid
         * oversubscribing the link. Max center spread
         * is 2.5%; use 5% for safety's sake.
         */
        u32 bps = target_clock * bpp * 21 / 20;
        return DIV_ROUND_UP(bps, link_bw * 8);
}

static void intel_pch_transcoder_get_m_n(struct intel_crtc *crtc,
                                         struct intel_link_m_n *m_n)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum pipe pipe = crtc->pipe;

        m_n->link_m = intel_de_read(dev_priv, PCH_TRANS_LINK_M1(pipe));
        m_n->link_n = intel_de_read(dev_priv, PCH_TRANS_LINK_N1(pipe));
        m_n->gmch_m = intel_de_read(dev_priv, PCH_TRANS_DATA_M1(pipe))
                & ~TU_SIZE_MASK;
        m_n->gmch_n = intel_de_read(dev_priv, PCH_TRANS_DATA_N1(pipe));
        m_n->tu = ((intel_de_read(dev_priv, PCH_TRANS_DATA_M1(pipe))
                    & TU_SIZE_MASK) >> TU_SIZE_SHIFT) + 1;
}

static void intel_cpu_transcoder_get_m_n(struct intel_crtc *crtc,
                                         enum transcoder transcoder,
                                         struct intel_link_m_n *m_n,
                                         struct intel_link_m_n *m2_n2)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum pipe pipe = crtc->pipe;

        if (DISPLAY_VER(dev_priv) >= 5) {
                m_n->link_m = intel_de_read(dev_priv,
                                            PIPE_LINK_M1(transcoder));
                m_n->link_n = intel_de_read(dev_priv,
                                            PIPE_LINK_N1(transcoder));
                m_n->gmch_m = intel_de_read(dev_priv,
                                            PIPE_DATA_M1(transcoder))
                        & ~TU_SIZE_MASK;
                m_n->gmch_n = intel_de_read(dev_priv,
                                            PIPE_DATA_N1(transcoder));
                m_n->tu = ((intel_de_read(dev_priv, PIPE_DATA_M1(transcoder))
                            & TU_SIZE_MASK) >> TU_SIZE_SHIFT) + 1;

                if (m2_n2 && transcoder_has_m2_n2(dev_priv, transcoder)) {
                        m2_n2->link_m = intel_de_read(dev_priv,
                                                      PIPE_LINK_M2(transcoder));
                        m2_n2->link_n = intel_de_read(dev_priv,
                                                             PIPE_LINK_N2(transcoder));
                        m2_n2->gmch_m = intel_de_read(dev_priv,
                                                             PIPE_DATA_M2(transcoder))
                                        & ~TU_SIZE_MASK;
                        m2_n2->gmch_n = intel_de_read(dev_priv,
                                                             PIPE_DATA_N2(transcoder));
                        m2_n2->tu = ((intel_de_read(dev_priv, PIPE_DATA_M2(transcoder))
                                        & TU_SIZE_MASK) >> TU_SIZE_SHIFT) + 1;
                }
        } else {
                m_n->link_m = intel_de_read(dev_priv, PIPE_LINK_M_G4X(pipe));
                m_n->link_n = intel_de_read(dev_priv, PIPE_LINK_N_G4X(pipe));
                m_n->gmch_m = intel_de_read(dev_priv, PIPE_DATA_M_G4X(pipe))
                        & ~TU_SIZE_MASK;
                m_n->gmch_n = intel_de_read(dev_priv, PIPE_DATA_N_G4X(pipe));
                m_n->tu = ((intel_de_read(dev_priv, PIPE_DATA_M_G4X(pipe))
                            & TU_SIZE_MASK) >> TU_SIZE_SHIFT) + 1;
        }
}

void intel_dp_get_m_n(struct intel_crtc *crtc,
                      struct intel_crtc_state *pipe_config)
{
        if (pipe_config->has_pch_encoder)
                intel_pch_transcoder_get_m_n(crtc, &pipe_config->dp_m_n);
        else
                intel_cpu_transcoder_get_m_n(crtc, pipe_config->cpu_transcoder,
                                             &pipe_config->dp_m_n,
                                             &pipe_config->dp_m2_n2);
}

static void ilk_get_fdi_m_n_config(struct intel_crtc *crtc,
                                   struct intel_crtc_state *pipe_config)
{
        intel_cpu_transcoder_get_m_n(crtc, pipe_config->cpu_transcoder,
                                     &pipe_config->fdi_m_n, NULL);
}

static void ilk_get_pfit_pos_size(struct intel_crtc_state *crtc_state,
                                  u32 pos, u32 size)
{
        drm_rect_init(&crtc_state->pch_pfit.dst,
                      pos >> 16, pos & 0xffff,
                      size >> 16, size & 0xffff);
}

static void skl_get_pfit_config(struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct intel_crtc_scaler_state *scaler_state = &crtc_state->scaler_state;
        int id = -1;
        int i;

        /* find scaler attached to this pipe */
        for (i = 0; i < crtc->num_scalers; i++) {
                u32 ctl, pos, size;

                ctl = intel_de_read(dev_priv, SKL_PS_CTRL(crtc->pipe, i));
                if ((ctl & (PS_SCALER_EN | PS_PLANE_SEL_MASK)) != PS_SCALER_EN)
                        continue;

                id = i;
                crtc_state->pch_pfit.enabled = true;

                pos = intel_de_read(dev_priv, SKL_PS_WIN_POS(crtc->pipe, i));
                size = intel_de_read(dev_priv, SKL_PS_WIN_SZ(crtc->pipe, i));

                ilk_get_pfit_pos_size(crtc_state, pos, size);

                scaler_state->scalers[i].in_use = true;
                break;
        }

        scaler_state->scaler_id = id;
        if (id >= 0)
                scaler_state->scaler_users |= (1 << SKL_CRTC_INDEX);
        else
                scaler_state->scaler_users &= ~(1 << SKL_CRTC_INDEX);
}

static void ilk_get_pfit_config(struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        u32 ctl, pos, size;

        ctl = intel_de_read(dev_priv, PF_CTL(crtc->pipe));
        if ((ctl & PF_ENABLE) == 0)
                return;

        crtc_state->pch_pfit.enabled = true;

        pos = intel_de_read(dev_priv, PF_WIN_POS(crtc->pipe));
        size = intel_de_read(dev_priv, PF_WIN_SZ(crtc->pipe));

        ilk_get_pfit_pos_size(crtc_state, pos, size);

        /*
         * We currently do not free assignements of panel fitters on
         * ivb/hsw (since we don't use the higher upscaling modes which
         * differentiates them) so just WARN about this case for now.
         */
        drm_WARN_ON(&dev_priv->drm, DISPLAY_VER(dev_priv) == 7 &&
                    (ctl & PF_PIPE_SEL_MASK_IVB) != PF_PIPE_SEL_IVB(crtc->pipe));
}

static bool ilk_get_pipe_config(struct intel_crtc *crtc,
                                struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum intel_display_power_domain power_domain;
        intel_wakeref_t wakeref;
        u32 tmp;
        bool ret;

        power_domain = POWER_DOMAIN_PIPE(crtc->pipe);
        wakeref = intel_display_power_get_if_enabled(dev_priv, power_domain);
        if (!wakeref)
                return false;

        pipe_config->cpu_transcoder = (enum transcoder) crtc->pipe;
        pipe_config->shared_dpll = NULL;

        ret = false;
        tmp = intel_de_read(dev_priv, PIPECONF(crtc->pipe));
        if (!(tmp & PIPECONF_ENABLE))
                goto out;

        switch (tmp & PIPECONF_BPC_MASK) {
        case PIPECONF_6BPC:
                pipe_config->pipe_bpp = 18;
                break;
        case PIPECONF_8BPC:
                pipe_config->pipe_bpp = 24;
                break;
        case PIPECONF_10BPC:
                pipe_config->pipe_bpp = 30;
                break;
        case PIPECONF_12BPC:
                pipe_config->pipe_bpp = 36;
                break;
        default:
                break;
        }

        if (tmp & PIPECONF_COLOR_RANGE_SELECT)
                pipe_config->limited_color_range = true;

        switch (tmp & PIPECONF_OUTPUT_COLORSPACE_MASK) {
        case PIPECONF_OUTPUT_COLORSPACE_YUV601:
        case PIPECONF_OUTPUT_COLORSPACE_YUV709:
                pipe_config->output_format = INTEL_OUTPUT_FORMAT_YCBCR444;
                break;
        default:
                pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
                break;
        }

        pipe_config->gamma_mode = (tmp & PIPECONF_GAMMA_MODE_MASK_ILK) >>
                PIPECONF_GAMMA_MODE_SHIFT;

        pipe_config->csc_mode = intel_de_read(dev_priv,
                                              PIPE_CSC_MODE(crtc->pipe));

        i9xx_get_pipe_color_config(pipe_config);
        intel_color_get_config(pipe_config);

        if (intel_de_read(dev_priv, PCH_TRANSCONF(crtc->pipe)) & TRANS_ENABLE) {
                struct intel_shared_dpll *pll;
                enum intel_dpll_id pll_id;
                bool pll_active;

                pipe_config->has_pch_encoder = true;

                tmp = intel_de_read(dev_priv, FDI_RX_CTL(crtc->pipe));
                pipe_config->fdi_lanes = ((FDI_DP_PORT_WIDTH_MASK & tmp) >>
                                          FDI_DP_PORT_WIDTH_SHIFT) + 1;

                ilk_get_fdi_m_n_config(crtc, pipe_config);

                if (HAS_PCH_IBX(dev_priv)) {
                        /*
                         * The pipe->pch transcoder and pch transcoder->pll
                         * mapping is fixed.
                         */
                        pll_id = (enum intel_dpll_id) crtc->pipe;
                } else {
                        tmp = intel_de_read(dev_priv, PCH_DPLL_SEL);
                        if (tmp & TRANS_DPLLB_SEL(crtc->pipe))
                                pll_id = DPLL_ID_PCH_PLL_B;
                        else
                                pll_id= DPLL_ID_PCH_PLL_A;
                }

                pipe_config->shared_dpll =
                        intel_get_shared_dpll_by_id(dev_priv, pll_id);
                pll = pipe_config->shared_dpll;

                pll_active = intel_dpll_get_hw_state(dev_priv, pll,
                                                     &pipe_config->dpll_hw_state);
                drm_WARN_ON(dev, !pll_active);

                tmp = pipe_config->dpll_hw_state.dpll;
                pipe_config->pixel_multiplier =
                        ((tmp & PLL_REF_SDVO_HDMI_MULTIPLIER_MASK)
                         >> PLL_REF_SDVO_HDMI_MULTIPLIER_SHIFT) + 1;

                ilk_pch_clock_get(crtc, pipe_config);
        } else {
                pipe_config->pixel_multiplier = 1;
        }

        intel_get_transcoder_timings(crtc, pipe_config);
        intel_get_pipe_src_size(crtc, pipe_config);

        ilk_get_pfit_config(pipe_config);

        ret = true;

out:
        intel_display_power_put(dev_priv, power_domain, wakeref);

        return ret;
}

static bool hsw_get_transcoder_state(struct intel_crtc *crtc,
                                     struct intel_crtc_state *pipe_config,
                                     struct intel_display_power_domain_set *power_domain_set)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        unsigned long panel_transcoder_mask = BIT(TRANSCODER_EDP);
        unsigned long enabled_panel_transcoders = 0;
        enum transcoder panel_transcoder;
        u32 tmp;

        if (DISPLAY_VER(dev_priv) >= 11)
                panel_transcoder_mask |=
                        BIT(TRANSCODER_DSI_0) | BIT(TRANSCODER_DSI_1);

        /*
         * The pipe->transcoder mapping is fixed with the exception of the eDP
         * and DSI transcoders handled below.
         */
        pipe_config->cpu_transcoder = (enum transcoder) crtc->pipe;

        /*
         * XXX: Do intel_display_power_get_if_enabled before reading this (for
         * consistency and less surprising code; it's in always on power).
         */
        for_each_cpu_transcoder_masked(dev_priv, panel_transcoder,
                                       panel_transcoder_mask) {
                bool force_thru = false;
                enum pipe trans_pipe;

                tmp = intel_de_read(dev_priv,
                                    TRANS_DDI_FUNC_CTL(panel_transcoder));
                if (!(tmp & TRANS_DDI_FUNC_ENABLE))
                        continue;

                /*
                 * Log all enabled ones, only use the first one.
                 *
                 * FIXME: This won't work for two separate DSI displays.
                 */
                enabled_panel_transcoders |= BIT(panel_transcoder);
                if (enabled_panel_transcoders != BIT(panel_transcoder))
                        continue;

                switch (tmp & TRANS_DDI_EDP_INPUT_MASK) {
                default:
                        drm_WARN(dev, 1,
                                 "unknown pipe linked to transcoder %s\n",
                                 transcoder_name(panel_transcoder));
                        fallthrough;
                case TRANS_DDI_EDP_INPUT_A_ONOFF:
                        force_thru = true;
                        fallthrough;
                case TRANS_DDI_EDP_INPUT_A_ON:
                        trans_pipe = PIPE_A;
                        break;
                case TRANS_DDI_EDP_INPUT_B_ONOFF:
                        trans_pipe = PIPE_B;
                        break;
                case TRANS_DDI_EDP_INPUT_C_ONOFF:
                        trans_pipe = PIPE_C;
                        break;
                case TRANS_DDI_EDP_INPUT_D_ONOFF:
                        trans_pipe = PIPE_D;
                        break;
                }

                if (trans_pipe == crtc->pipe) {
                        pipe_config->cpu_transcoder = panel_transcoder;
                        pipe_config->pch_pfit.force_thru = force_thru;
                }
        }

        /*
         * Valid combos: none, eDP, DSI0, DSI1, DSI0+DSI1
         */
        drm_WARN_ON(dev, (enabled_panel_transcoders & BIT(TRANSCODER_EDP)) &&
                    enabled_panel_transcoders != BIT(TRANSCODER_EDP));

        if (!intel_display_power_get_in_set_if_enabled(dev_priv, power_domain_set,
                                                       POWER_DOMAIN_TRANSCODER(pipe_config->cpu_transcoder)))
                return false;

        tmp = intel_de_read(dev_priv, PIPECONF(pipe_config->cpu_transcoder));

        return tmp & PIPECONF_ENABLE;
}

static bool bxt_get_dsi_transcoder_state(struct intel_crtc *crtc,
                                         struct intel_crtc_state *pipe_config,
                                         struct intel_display_power_domain_set *power_domain_set)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum transcoder cpu_transcoder;
        enum port port;
        u32 tmp;

        for_each_port_masked(port, BIT(PORT_A) | BIT(PORT_C)) {
                if (port == PORT_A)
                        cpu_transcoder = TRANSCODER_DSI_A;
                else
                        cpu_transcoder = TRANSCODER_DSI_C;

                if (!intel_display_power_get_in_set_if_enabled(dev_priv, power_domain_set,
                                                               POWER_DOMAIN_TRANSCODER(cpu_transcoder)))
                        continue;

                /*
                 * The PLL needs to be enabled with a valid divider
                 * configuration, otherwise accessing DSI registers will hang
                 * the machine. See BSpec North Display Engine
                 * registers/MIPI[BXT]. We can break out here early, since we
                 * need the same DSI PLL to be enabled for both DSI ports.
                 */
                if (!bxt_dsi_pll_is_enabled(dev_priv))
                        break;

                /* XXX: this works for video mode only */
                tmp = intel_de_read(dev_priv, BXT_MIPI_PORT_CTRL(port));
                if (!(tmp & DPI_ENABLE))
                        continue;

                tmp = intel_de_read(dev_priv, MIPI_CTRL(port));
                if ((tmp & BXT_PIPE_SELECT_MASK) != BXT_PIPE_SELECT(crtc->pipe))
                        continue;

                pipe_config->cpu_transcoder = cpu_transcoder;
                break;
        }

        return transcoder_is_dsi(pipe_config->cpu_transcoder);
}

static void hsw_get_ddi_port_state(struct intel_crtc *crtc,
                                   struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum transcoder cpu_transcoder = pipe_config->cpu_transcoder;
        enum port port;
        u32 tmp;

        if (transcoder_is_dsi(cpu_transcoder)) {
                port = (cpu_transcoder == TRANSCODER_DSI_A) ?
                                                PORT_A : PORT_B;
        } else {
                tmp = intel_de_read(dev_priv,
                                    TRANS_DDI_FUNC_CTL(cpu_transcoder));
                if (!(tmp & TRANS_DDI_FUNC_ENABLE))
                        return;
                if (DISPLAY_VER(dev_priv) >= 12)
                        port = TGL_TRANS_DDI_FUNC_CTL_VAL_TO_PORT(tmp);
                else
                        port = TRANS_DDI_FUNC_CTL_VAL_TO_PORT(tmp);
        }

        /*
         * Haswell has only FDI/PCH transcoder A. It is which is connected to
         * DDI E. So just check whether this pipe is wired to DDI E and whether
         * the PCH transcoder is on.
         */
        if (DISPLAY_VER(dev_priv) < 9 &&
            (port == PORT_E) && intel_de_read(dev_priv, LPT_TRANSCONF) & TRANS_ENABLE) {
                pipe_config->has_pch_encoder = true;

                tmp = intel_de_read(dev_priv, FDI_RX_CTL(PIPE_A));
                pipe_config->fdi_lanes = ((FDI_DP_PORT_WIDTH_MASK & tmp) >>
                                          FDI_DP_PORT_WIDTH_SHIFT) + 1;

                ilk_get_fdi_m_n_config(crtc, pipe_config);
        }
}

static bool hsw_get_pipe_config(struct intel_crtc *crtc,
                                struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct intel_display_power_domain_set power_domain_set = { };
        bool active;
        u32 tmp;

        if (!intel_display_power_get_in_set_if_enabled(dev_priv, &power_domain_set,
                                                       POWER_DOMAIN_PIPE(crtc->pipe)))
                return false;

        pipe_config->shared_dpll = NULL;

        active = hsw_get_transcoder_state(crtc, pipe_config, &power_domain_set);

        if ((IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv)) &&
            bxt_get_dsi_transcoder_state(crtc, pipe_config, &power_domain_set)) {
                drm_WARN_ON(&dev_priv->drm, active);
                active = true;
        }

        intel_dsc_get_config(pipe_config);
        if (DISPLAY_VER(dev_priv) >= 13 && !pipe_config->dsc.compression_enable)
                intel_uncompressed_joiner_get_config(pipe_config);

        if (!active) {
                /* bigjoiner slave doesn't enable transcoder */
                if (!pipe_config->bigjoiner_slave)
                        goto out;

                active = true;
                pipe_config->pixel_multiplier = 1;

                /* we cannot read out most state, so don't bother.. */
                pipe_config->quirks |= PIPE_CONFIG_QUIRK_BIGJOINER_SLAVE;
        } else if (!transcoder_is_dsi(pipe_config->cpu_transcoder) ||
            DISPLAY_VER(dev_priv) >= 11) {
                hsw_get_ddi_port_state(crtc, pipe_config);
                intel_get_transcoder_timings(crtc, pipe_config);
        }

        if (HAS_VRR(dev_priv) && !transcoder_is_dsi(pipe_config->cpu_transcoder))
                intel_vrr_get_config(crtc, pipe_config);

        intel_get_pipe_src_size(crtc, pipe_config);

        if (IS_HASWELL(dev_priv)) {
                u32 tmp = intel_de_read(dev_priv,
                                        PIPECONF(pipe_config->cpu_transcoder));

                if (tmp & PIPECONF_OUTPUT_COLORSPACE_YUV_HSW)
                        pipe_config->output_format = INTEL_OUTPUT_FORMAT_YCBCR444;
                else
                        pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
        } else {
                pipe_config->output_format =
                        bdw_get_pipemisc_output_format(crtc);
        }

        pipe_config->gamma_mode = intel_de_read(dev_priv,
                                                GAMMA_MODE(crtc->pipe));

        pipe_config->csc_mode = intel_de_read(dev_priv,
                                              PIPE_CSC_MODE(crtc->pipe));

        if (DISPLAY_VER(dev_priv) >= 9) {
                tmp = intel_de_read(dev_priv, SKL_BOTTOM_COLOR(crtc->pipe));

                if (tmp & SKL_BOTTOM_COLOR_GAMMA_ENABLE)
                        pipe_config->gamma_enable = true;

                if (tmp & SKL_BOTTOM_COLOR_CSC_ENABLE)
                        pipe_config->csc_enable = true;
        } else {
                i9xx_get_pipe_color_config(pipe_config);
        }

        intel_color_get_config(pipe_config);

        tmp = intel_de_read(dev_priv, WM_LINETIME(crtc->pipe));
        pipe_config->linetime = REG_FIELD_GET(HSW_LINETIME_MASK, tmp);
        if (IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv))
                pipe_config->ips_linetime =
                        REG_FIELD_GET(HSW_IPS_LINETIME_MASK, tmp);

        if (intel_display_power_get_in_set_if_enabled(dev_priv, &power_domain_set,
                                                      POWER_DOMAIN_PIPE_PANEL_FITTER(crtc->pipe))) {
                if (DISPLAY_VER(dev_priv) >= 9)
                        skl_get_pfit_config(pipe_config);
                else
                        ilk_get_pfit_config(pipe_config);
        }

        if (hsw_crtc_supports_ips(crtc)) {
                if (IS_HASWELL(dev_priv))
                        pipe_config->ips_enabled = intel_de_read(dev_priv,
                                                                 IPS_CTL) & IPS_ENABLE;
                else {
                        /*
                         * We cannot readout IPS state on broadwell, set to
                         * true so we can set it to a defined state on first
                         * commit.
                         */
                        pipe_config->ips_enabled = true;
                }
        }

        if (pipe_config->bigjoiner_slave) {
                /* Cannot be read out as a slave, set to 0. */
                pipe_config->pixel_multiplier = 0;
        } else if (pipe_config->cpu_transcoder != TRANSCODER_EDP &&
            !transcoder_is_dsi(pipe_config->cpu_transcoder)) {
                pipe_config->pixel_multiplier =
                        intel_de_read(dev_priv,
                                      PIPE_MULT(pipe_config->cpu_transcoder)) + 1;
        } else {
                pipe_config->pixel_multiplier = 1;
        }

out:
        intel_display_power_put_all_in_set(dev_priv, &power_domain_set);

        return active;
}

static bool intel_crtc_get_pipe_config(struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *i915 = to_i915(crtc->base.dev);

        if (!i915->display.get_pipe_config(crtc, crtc_state))
                return false;

        crtc_state->hw.active = true;

        intel_crtc_readout_derived_state(crtc_state);

        return true;
}

/* VESA 640x480x72Hz mode to set on the pipe */
static const struct drm_display_mode load_detect_mode = {
        DRM_MODE("640x480", DRM_MODE_TYPE_DEFAULT, 31500, 640, 664,
                 704, 832, 0, 480, 489, 491, 520, 0, DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC),
};

static int intel_modeset_disable_planes(struct drm_atomic_state *state,
                                        struct drm_crtc *crtc)
{
        struct drm_plane *plane;
        struct drm_plane_state *plane_state;
        int ret, i;

        ret = drm_atomic_add_affected_planes(state, crtc);
        if (ret)
                return ret;

        for_each_new_plane_in_state(state, plane, plane_state, i) {
                if (plane_state->crtc != crtc)
                        continue;

                ret = drm_atomic_set_crtc_for_plane(plane_state, NULL);
                if (ret)
                        return ret;

                drm_atomic_set_fb_for_plane(plane_state, NULL);
        }

        return 0;
}

int intel_get_load_detect_pipe(struct drm_connector *connector,
                               struct intel_load_detect_pipe *old,
                               struct drm_modeset_acquire_ctx *ctx)
{
        struct intel_encoder *encoder =
                intel_attached_encoder(to_intel_connector(connector));
        struct intel_crtc *possible_crtc;
        struct intel_crtc *crtc = NULL;
        struct drm_device *dev = encoder->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_mode_config *config = &dev->mode_config;
        struct drm_atomic_state *state = NULL, *restore_state = NULL;
        struct drm_connector_state *connector_state;
        struct intel_crtc_state *crtc_state;
        int ret;

        drm_dbg_kms(&dev_priv->drm, "[CONNECTOR:%d:%s], [ENCODER:%d:%s]\n",
                    connector->base.id, connector->name,
                    encoder->base.base.id, encoder->base.name);

        old->restore_state = NULL;

        drm_WARN_ON(dev, !drm_modeset_is_locked(&config->connection_mutex));

        /*
         * Algorithm gets a little messy:
         *
         *   - if the connector already has an assigned crtc, use it (but make
         *     sure it's on first)
         *
         *   - try to find the first unused crtc that can drive this connector,
         *     and use that if we find one
         */

        /* See if we already have a CRTC for this connector */
        if (connector->state->crtc) {
                crtc = to_intel_crtc(connector->state->crtc);

                ret = drm_modeset_lock(&crtc->base.mutex, ctx);
                if (ret)
                        goto fail;

                /* Make sure the crtc and connector are running */
                goto found;
        }

        /* Find an unused one (if possible) */
        for_each_intel_crtc(dev, possible_crtc) {
                if (!(encoder->base.possible_crtcs &
                      drm_crtc_mask(&possible_crtc->base)))
                        continue;

                ret = drm_modeset_lock(&possible_crtc->base.mutex, ctx);
                if (ret)
                        goto fail;

                if (possible_crtc->base.state->enable) {
                        drm_modeset_unlock(&possible_crtc->base.mutex);
                        continue;
                }

                crtc = possible_crtc;
                break;
        }

        /*
         * If we didn't find an unused CRTC, don't use any.
         */
        if (!crtc) {
                drm_dbg_kms(&dev_priv->drm,
                            "no pipe available for load-detect\n");
                ret = -ENODEV;
                goto fail;
        }

found:
        state = drm_atomic_state_alloc(dev);
        restore_state = drm_atomic_state_alloc(dev);
        if (!state || !restore_state) {
                ret = -ENOMEM;
                goto fail;
        }

        state->acquire_ctx = ctx;
        restore_state->acquire_ctx = ctx;

        connector_state = drm_atomic_get_connector_state(state, connector);
        if (IS_ERR(connector_state)) {
                ret = PTR_ERR(connector_state);
                goto fail;
        }

        ret = drm_atomic_set_crtc_for_connector(connector_state, &crtc->base);
        if (ret)
                goto fail;

        crtc_state = intel_atomic_get_crtc_state(state, crtc);
        if (IS_ERR(crtc_state)) {
                ret = PTR_ERR(crtc_state);
                goto fail;
        }

        crtc_state->uapi.active = true;

        ret = drm_atomic_set_mode_for_crtc(&crtc_state->uapi,
                                           &load_detect_mode);
        if (ret)
                goto fail;

        ret = intel_modeset_disable_planes(state, &crtc->base);
        if (ret)
                goto fail;

        ret = PTR_ERR_OR_ZERO(drm_atomic_get_connector_state(restore_state, connector));
        if (!ret)
                ret = PTR_ERR_OR_ZERO(drm_atomic_get_crtc_state(restore_state, &crtc->base));
        if (!ret)
                ret = drm_atomic_add_affected_planes(restore_state, &crtc->base);
        if (ret) {
                drm_dbg_kms(&dev_priv->drm,
                            "Failed to create a copy of old state to restore: %i\n",
                            ret);
                goto fail;
        }

        ret = drm_atomic_commit(state);
        if (ret) {
                drm_dbg_kms(&dev_priv->drm,
                            "failed to set mode on load-detect pipe\n");
                goto fail;
        }

        old->restore_state = restore_state;
        drm_atomic_state_put(state);

        /* let the connector get through one full cycle before testing */
        intel_wait_for_vblank(dev_priv, crtc->pipe);
        return true;

fail:
        if (state) {
                drm_atomic_state_put(state);
                state = NULL;
        }
        if (restore_state) {
                drm_atomic_state_put(restore_state);
                restore_state = NULL;
        }

        if (ret == -EDEADLK)
                return ret;

        return false;
}

void intel_release_load_detect_pipe(struct drm_connector *connector,
                                    struct intel_load_detect_pipe *old,
                                    struct drm_modeset_acquire_ctx *ctx)
{
        struct intel_encoder *intel_encoder =
                intel_attached_encoder(to_intel_connector(connector));
        struct drm_i915_private *i915 = to_i915(intel_encoder->base.dev);
        struct drm_encoder *encoder = &intel_encoder->base;
        struct drm_atomic_state *state = old->restore_state;
        int ret;

        drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s], [ENCODER:%d:%s]\n",
                    connector->base.id, connector->name,
                    encoder->base.id, encoder->name);

        if (!state)
                return;

        ret = drm_atomic_helper_commit_duplicated_state(state, ctx);
        if (ret)
                drm_dbg_kms(&i915->drm,
                            "Couldn't release load detect pipe: %i\n", ret);
        drm_atomic_state_put(state);
}

static int i9xx_pll_refclk(struct drm_device *dev,
                           const struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        u32 dpll = pipe_config->dpll_hw_state.dpll;

        if ((dpll & PLL_REF_INPUT_MASK) == PLLB_REF_INPUT_SPREADSPECTRUMIN)
                return dev_priv->vbt.lvds_ssc_freq;
        else if (HAS_PCH_SPLIT(dev_priv))
                return 120000;
        else if (DISPLAY_VER(dev_priv) != 2)
                return 96000;
        else
                return 48000;
}

/* Returns the clock of the currently programmed mode of the given pipe. */
static void i9xx_crtc_clock_get(struct intel_crtc *crtc,
                                struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        u32 dpll = pipe_config->dpll_hw_state.dpll;
        u32 fp;
        struct dpll clock;
        int port_clock;
        int refclk = i9xx_pll_refclk(dev, pipe_config);

        if ((dpll & DISPLAY_RATE_SELECT_FPA1) == 0)
                fp = pipe_config->dpll_hw_state.fp0;
        else
                fp = pipe_config->dpll_hw_state.fp1;

        clock.m1 = (fp & FP_M1_DIV_MASK) >> FP_M1_DIV_SHIFT;
        if (IS_PINEVIEW(dev_priv)) {
                clock.n = ffs((fp & FP_N_PINEVIEW_DIV_MASK) >> FP_N_DIV_SHIFT) - 1;
                clock.m2 = (fp & FP_M2_PINEVIEW_DIV_MASK) >> FP_M2_DIV_SHIFT;
        } else {
                clock.n = (fp & FP_N_DIV_MASK) >> FP_N_DIV_SHIFT;
                clock.m2 = (fp & FP_M2_DIV_MASK) >> FP_M2_DIV_SHIFT;
        }

        if (DISPLAY_VER(dev_priv) != 2) {
                if (IS_PINEVIEW(dev_priv))
                        clock.p1 = ffs((dpll & DPLL_FPA01_P1_POST_DIV_MASK_PINEVIEW) >>
                                DPLL_FPA01_P1_POST_DIV_SHIFT_PINEVIEW);
                else
                        clock.p1 = ffs((dpll & DPLL_FPA01_P1_POST_DIV_MASK) >>
                               DPLL_FPA01_P1_POST_DIV_SHIFT);

                switch (dpll & DPLL_MODE_MASK) {
                case DPLLB_MODE_DAC_SERIAL:
                        clock.p2 = dpll & DPLL_DAC_SERIAL_P2_CLOCK_DIV_5 ?
                                5 : 10;
                        break;
                case DPLLB_MODE_LVDS:
                        clock.p2 = dpll & DPLLB_LVDS_P2_CLOCK_DIV_7 ?
                                7 : 14;
                        break;
                default:
                        drm_dbg_kms(&dev_priv->drm,
                                    "Unknown DPLL mode %08x in programmed "
                                    "mode\n", (int)(dpll & DPLL_MODE_MASK));
                        return;
                }

                if (IS_PINEVIEW(dev_priv))
                        port_clock = pnv_calc_dpll_params(refclk, &clock);
                else
                        port_clock = i9xx_calc_dpll_params(refclk, &clock);
        } else {
                enum pipe lvds_pipe;

                if (IS_I85X(dev_priv) &&
                    intel_lvds_port_enabled(dev_priv, LVDS, &lvds_pipe) &&
                    lvds_pipe == crtc->pipe) {
                        u32 lvds = intel_de_read(dev_priv, LVDS);

                        clock.p1 = ffs((dpll & DPLL_FPA01_P1_POST_DIV_MASK_I830_LVDS) >>
                                       DPLL_FPA01_P1_POST_DIV_SHIFT);

                        if (lvds & LVDS_CLKB_POWER_UP)
                                clock.p2 = 7;
                        else
                                clock.p2 = 14;
                } else {
                        if (dpll & PLL_P1_DIVIDE_BY_TWO)
                                clock.p1 = 2;
                        else {
                                clock.p1 = ((dpll & DPLL_FPA01_P1_POST_DIV_MASK_I830) >>
                                            DPLL_FPA01_P1_POST_DIV_SHIFT) + 2;
                        }
                        if (dpll & PLL_P2_DIVIDE_BY_4)
                                clock.p2 = 4;
                        else
                                clock.p2 = 2;
                }

                port_clock = i9xx_calc_dpll_params(refclk, &clock);
        }

        /*
         * This value includes pixel_multiplier. We will use
         * port_clock to compute adjusted_mode.crtc_clock in the
         * encoder's get_config() function.
         */
        pipe_config->port_clock = port_clock;
}

int intel_dotclock_calculate(int link_freq,
                             const struct intel_link_m_n *m_n)
{
        /*
         * The calculation for the data clock is:
         * pixel_clock = ((m/n)*(link_clock * nr_lanes))/bpp
         * But we want to avoid losing precison if possible, so:
         * pixel_clock = ((m * link_clock * nr_lanes)/(n*bpp))
         *
         * and the link clock is simpler:
         * link_clock = (m * link_clock) / n
         */

        if (!m_n->link_n)
                return 0;

        return div_u64(mul_u32_u32(m_n->link_m, link_freq), m_n->link_n);
}

static void ilk_pch_clock_get(struct intel_crtc *crtc,
                              struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        /* read out port_clock from the DPLL */
        i9xx_crtc_clock_get(crtc, pipe_config);

        /*
         * In case there is an active pipe without active ports,
         * we may need some idea for the dotclock anyway.
         * Calculate one based on the FDI configuration.
         */
        pipe_config->hw.adjusted_mode.crtc_clock =
                intel_dotclock_calculate(intel_fdi_link_freq(dev_priv, pipe_config),
                                         &pipe_config->fdi_m_n);
}

/* Returns the currently programmed mode of the given encoder. */
struct drm_display_mode *
intel_encoder_current_mode(struct intel_encoder *encoder)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_crtc_state *crtc_state;
        struct drm_display_mode *mode;
        struct intel_crtc *crtc;
        enum pipe pipe;

        if (!encoder->get_hw_state(encoder, &pipe))
                return NULL;

        crtc = intel_get_crtc_for_pipe(dev_priv, pipe);

        mode = kzalloc(sizeof(*mode), GFP_KERNEL);
        if (!mode)
                return NULL;

        crtc_state = intel_crtc_state_alloc(crtc);
        if (!crtc_state) {
                kfree(mode);
                return NULL;
        }

        if (!intel_crtc_get_pipe_config(crtc_state)) {
                kfree(crtc_state);
                kfree(mode);
                return NULL;
        }

        intel_encoder_get_config(encoder, crtc_state);

        intel_mode_from_crtc_timings(mode, &crtc_state->hw.adjusted_mode);

        kfree(crtc_state);

        return mode;
}

/**
 * intel_wm_need_update - Check whether watermarks need updating
 * @cur: current plane state
 * @new: new plane state
 *
 * Check current plane state versus the new one to determine whether
 * watermarks need to be recalculated.
 *
 * Returns true or false.
 */
static bool intel_wm_need_update(const struct intel_plane_state *cur,
                                 struct intel_plane_state *new)
{
        /* Update watermarks on tiling or size changes. */
        if (new->uapi.visible != cur->uapi.visible)
                return true;

        if (!cur->hw.fb || !new->hw.fb)
                return false;

        if (cur->hw.fb->modifier != new->hw.fb->modifier ||
            cur->hw.rotation != new->hw.rotation ||
            drm_rect_width(&new->uapi.src) != drm_rect_width(&cur->uapi.src) ||
            drm_rect_height(&new->uapi.src) != drm_rect_height(&cur->uapi.src) ||
            drm_rect_width(&new->uapi.dst) != drm_rect_width(&cur->uapi.dst) ||
            drm_rect_height(&new->uapi.dst) != drm_rect_height(&cur->uapi.dst))
                return true;

        return false;
}

static bool needs_scaling(const struct intel_plane_state *state)
{
        int src_w = drm_rect_width(&state->uapi.src) >> 16;
        int src_h = drm_rect_height(&state->uapi.src) >> 16;
        int dst_w = drm_rect_width(&state->uapi.dst);
        int dst_h = drm_rect_height(&state->uapi.dst);

        return (src_w != dst_w || src_h != dst_h);
}

int intel_plane_atomic_calc_changes(const struct intel_crtc_state *old_crtc_state,
                                    struct intel_crtc_state *crtc_state,
                                    const struct intel_plane_state *old_plane_state,
                                    struct intel_plane_state *plane_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        bool mode_changed = intel_crtc_needs_modeset(crtc_state);
        bool was_crtc_enabled = old_crtc_state->hw.active;
        bool is_crtc_enabled = crtc_state->hw.active;
        bool turn_off, turn_on, visible, was_visible;
        int ret;

        if (DISPLAY_VER(dev_priv) >= 9 && plane->id != PLANE_CURSOR) {
                ret = skl_update_scaler_plane(crtc_state, plane_state);
                if (ret)
                        return ret;
        }

        was_visible = old_plane_state->uapi.visible;
        visible = plane_state->uapi.visible;

        if (!was_crtc_enabled && drm_WARN_ON(&dev_priv->drm, was_visible))
                was_visible = false;

        /*
         * Visibility is calculated as if the crtc was on, but
         * after scaler setup everything depends on it being off
         * when the crtc isn't active.
         *
         * FIXME this is wrong for watermarks. Watermarks should also
         * be computed as if the pipe would be active. Perhaps move
         * per-plane wm computation to the .check_plane() hook, and
         * only combine the results from all planes in the current place?
         */
        if (!is_crtc_enabled) {
                intel_plane_set_invisible(crtc_state, plane_state);
                visible = false;
        }

        if (!was_visible && !visible)
                return 0;

        turn_off = was_visible && (!visible || mode_changed);
        turn_on = visible && (!was_visible || mode_changed);

        drm_dbg_atomic(&dev_priv->drm,
                       "[CRTC:%d:%s] with [PLANE:%d:%s] visible %i -> %i, off %i, on %i, ms %i\n",
                       crtc->base.base.id, crtc->base.name,
                       plane->base.base.id, plane->base.name,
                       was_visible, visible,
                       turn_off, turn_on, mode_changed);

        if (turn_on) {
                if (DISPLAY_VER(dev_priv) < 5 && !IS_G4X(dev_priv))
                        crtc_state->update_wm_pre = true;

                /* must disable cxsr around plane enable/disable */
                if (plane->id != PLANE_CURSOR)
                        crtc_state->disable_cxsr = true;
        } else if (turn_off) {
                if (DISPLAY_VER(dev_priv) < 5 && !IS_G4X(dev_priv))
                        crtc_state->update_wm_post = true;

                /* must disable cxsr around plane enable/disable */
                if (plane->id != PLANE_CURSOR)
                        crtc_state->disable_cxsr = true;
        } else if (intel_wm_need_update(old_plane_state, plane_state)) {
                if (DISPLAY_VER(dev_priv) < 5 && !IS_G4X(dev_priv)) {
                        /* FIXME bollocks */
                        crtc_state->update_wm_pre = true;
                        crtc_state->update_wm_post = true;
                }
        }

        if (visible || was_visible)
                crtc_state->fb_bits |= plane->frontbuffer_bit;

        /*
         * ILK/SNB DVSACNTR/Sprite Enable
         * IVB SPR_CTL/Sprite Enable
         * "When in Self Refresh Big FIFO mode, a write to enable the
         *  plane will be internally buffered and delayed while Big FIFO
         *  mode is exiting."
         *
         * Which means that enabling the sprite can take an extra frame
         * when we start in big FIFO mode (LP1+). Thus we need to drop
         * down to LP0 and wait for vblank in order to make sure the
         * sprite gets enabled on the next vblank after the register write.
         * Doing otherwise would risk enabling the sprite one frame after
         * we've already signalled flip completion. We can resume LP1+
         * once the sprite has been enabled.
         *
         *
         * WaCxSRDisabledForSpriteScaling:ivb
         * IVB SPR_SCALE/Scaling Enable
         * "Low Power watermarks must be disabled for at least one
         *  frame before enabling sprite scaling, and kept disabled
         *  until sprite scaling is disabled."
         *
         * ILK/SNB DVSASCALE/Scaling Enable
         * "When in Self Refresh Big FIFO mode, scaling enable will be
         *  masked off while Big FIFO mode is exiting."
         *
         * Despite the w/a only being listed for IVB we assume that
         * the ILK/SNB note has similar ramifications, hence we apply
         * the w/a on all three platforms.
         *
         * With experimental results seems this is needed also for primary
         * plane, not only sprite plane.
         */
        if (plane->id != PLANE_CURSOR &&
            (IS_IRONLAKE(dev_priv) || IS_SANDYBRIDGE(dev_priv) ||
             IS_IVYBRIDGE(dev_priv)) &&
            (turn_on || (!needs_scaling(old_plane_state) &&
                         needs_scaling(plane_state))))
                crtc_state->disable_lp_wm = true;

        return 0;
}

static bool encoders_cloneable(const struct intel_encoder *a,
                               const struct intel_encoder *b)
{
        /* masks could be asymmetric, so check both ways */
        return a == b || (a->cloneable & (1 << b->type) &&
                          b->cloneable & (1 << a->type));
}

static bool check_single_encoder_cloning(struct intel_atomic_state *state,
                                         struct intel_crtc *crtc,
                                         struct intel_encoder *encoder)
{
        struct intel_encoder *source_encoder;
        struct drm_connector *connector;
        struct drm_connector_state *connector_state;
        int i;

        for_each_new_connector_in_state(&state->base, connector, connector_state, i) {
                if (connector_state->crtc != &crtc->base)
                        continue;

                source_encoder =
                        to_intel_encoder(connector_state->best_encoder);
                if (!encoders_cloneable(encoder, source_encoder))
                        return false;
        }

        return true;
}

static int icl_add_linked_planes(struct intel_atomic_state *state)
{
        struct intel_plane *plane, *linked;
        struct intel_plane_state *plane_state, *linked_plane_state;
        int i;

        for_each_new_intel_plane_in_state(state, plane, plane_state, i) {
                linked = plane_state->planar_linked_plane;

                if (!linked)
                        continue;

                linked_plane_state = intel_atomic_get_plane_state(state, linked);
                if (IS_ERR(linked_plane_state))
                        return PTR_ERR(linked_plane_state);

                drm_WARN_ON(state->base.dev,
                            linked_plane_state->planar_linked_plane != plane);
                drm_WARN_ON(state->base.dev,
                            linked_plane_state->planar_slave == plane_state->planar_slave);
        }

        return 0;
}

static int icl_check_nv12_planes(struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct intel_atomic_state *state = to_intel_atomic_state(crtc_state->uapi.state);
        struct intel_plane *plane, *linked;
        struct intel_plane_state *plane_state;
        int i;

        if (DISPLAY_VER(dev_priv) < 11)
                return 0;

        /*
         * Destroy all old plane links and make the slave plane invisible
         * in the crtc_state->active_planes mask.
         */
        for_each_new_intel_plane_in_state(state, plane, plane_state, i) {
                if (plane->pipe != crtc->pipe || !plane_state->planar_linked_plane)
                        continue;

                plane_state->planar_linked_plane = NULL;
                if (plane_state->planar_slave && !plane_state->uapi.visible) {
                        crtc_state->enabled_planes &= ~BIT(plane->id);
                        crtc_state->active_planes &= ~BIT(plane->id);
                        crtc_state->update_planes |= BIT(plane->id);
                }

                plane_state->planar_slave = false;
        }

        if (!crtc_state->nv12_planes)
                return 0;

        for_each_new_intel_plane_in_state(state, plane, plane_state, i) {
                struct intel_plane_state *linked_state = NULL;

                if (plane->pipe != crtc->pipe ||
                    !(crtc_state->nv12_planes & BIT(plane->id)))
                        continue;

                for_each_intel_plane_on_crtc(&dev_priv->drm, crtc, linked) {
                        if (!icl_is_nv12_y_plane(dev_priv, linked->id))
                                continue;

                        if (crtc_state->active_planes & BIT(linked->id))
                                continue;

                        linked_state = intel_atomic_get_plane_state(state, linked);
                        if (IS_ERR(linked_state))
                                return PTR_ERR(linked_state);

                        break;
                }

                if (!linked_state) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "Need %d free Y planes for planar YUV\n",
                                    hweight8(crtc_state->nv12_planes));

                        return -EINVAL;
                }

                plane_state->planar_linked_plane = linked;

                linked_state->planar_slave = true;
                linked_state->planar_linked_plane = plane;
                crtc_state->enabled_planes |= BIT(linked->id);
                crtc_state->active_planes |= BIT(linked->id);
                crtc_state->update_planes |= BIT(linked->id);
                drm_dbg_kms(&dev_priv->drm, "Using %s as Y plane for %s\n",
                            linked->base.name, plane->base.name);

                /* Copy parameters to slave plane */
                linked_state->ctl = plane_state->ctl | PLANE_CTL_YUV420_Y_PLANE;
                linked_state->color_ctl = plane_state->color_ctl;
                linked_state->view = plane_state->view;

                intel_plane_copy_hw_state(linked_state, plane_state);
                linked_state->uapi.src = plane_state->uapi.src;
                linked_state->uapi.dst = plane_state->uapi.dst;

                if (icl_is_hdr_plane(dev_priv, plane->id)) {
                        if (linked->id == PLANE_SPRITE5)
                                plane_state->cus_ctl |= PLANE_CUS_PLANE_7;
                        else if (linked->id == PLANE_SPRITE4)
                                plane_state->cus_ctl |= PLANE_CUS_PLANE_6;
                        else if (linked->id == PLANE_SPRITE3)
                                plane_state->cus_ctl |= PLANE_CUS_PLANE_5_RKL;
                        else if (linked->id == PLANE_SPRITE2)
                                plane_state->cus_ctl |= PLANE_CUS_PLANE_4_RKL;
                        else
                                MISSING_CASE(linked->id);
                }
        }

        return 0;
}

static bool c8_planes_changed(const struct intel_crtc_state *new_crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(new_crtc_state->uapi.crtc);
        struct intel_atomic_state *state =
                to_intel_atomic_state(new_crtc_state->uapi.state);
        const struct intel_crtc_state *old_crtc_state =
                intel_atomic_get_old_crtc_state(state, crtc);

        return !old_crtc_state->c8_planes != !new_crtc_state->c8_planes;
}

static u16 hsw_linetime_wm(const struct intel_crtc_state *crtc_state)
{
        const struct drm_display_mode *pipe_mode =
                &crtc_state->hw.pipe_mode;
        int linetime_wm;

        if (!crtc_state->hw.enable)
                return 0;

        linetime_wm = DIV_ROUND_CLOSEST(pipe_mode->crtc_htotal * 1000 * 8,
                                        pipe_mode->crtc_clock);

        return min(linetime_wm, 0x1ff);
}

static u16 hsw_ips_linetime_wm(const struct intel_crtc_state *crtc_state,
                               const struct intel_cdclk_state *cdclk_state)
{
        const struct drm_display_mode *pipe_mode =
                &crtc_state->hw.pipe_mode;
        int linetime_wm;

        if (!crtc_state->hw.enable)
                return 0;

        linetime_wm = DIV_ROUND_CLOSEST(pipe_mode->crtc_htotal * 1000 * 8,
                                        cdclk_state->logical.cdclk);

        return min(linetime_wm, 0x1ff);
}

static u16 skl_linetime_wm(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        const struct drm_display_mode *pipe_mode =
                &crtc_state->hw.pipe_mode;
        int linetime_wm;

        if (!crtc_state->hw.enable)
                return 0;

        linetime_wm = DIV_ROUND_UP(pipe_mode->crtc_htotal * 1000 * 8,
                                   crtc_state->pixel_rate);

        /* Display WA #1135: BXT:ALL GLK:ALL */
        if ((IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv)) &&
            dev_priv->ipc_enabled)
                linetime_wm /= 2;

        return min(linetime_wm, 0x1ff);
}

static int hsw_compute_linetime_wm(struct intel_atomic_state *state,
                                   struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct intel_crtc_state *crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        const struct intel_cdclk_state *cdclk_state;

        if (DISPLAY_VER(dev_priv) >= 9)
                crtc_state->linetime = skl_linetime_wm(crtc_state);
        else
                crtc_state->linetime = hsw_linetime_wm(crtc_state);

        if (!hsw_crtc_supports_ips(crtc))
                return 0;

        cdclk_state = intel_atomic_get_cdclk_state(state);
        if (IS_ERR(cdclk_state))
                return PTR_ERR(cdclk_state);

        crtc_state->ips_linetime = hsw_ips_linetime_wm(crtc_state,
                                                       cdclk_state);

        return 0;
}

static int intel_crtc_atomic_check(struct intel_atomic_state *state,
                                   struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct intel_crtc_state *crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        bool mode_changed = intel_crtc_needs_modeset(crtc_state);
        int ret;

        if (DISPLAY_VER(dev_priv) < 5 && !IS_G4X(dev_priv) &&
            mode_changed && !crtc_state->hw.active)
                crtc_state->update_wm_post = true;

        if (mode_changed && crtc_state->hw.enable &&
            dev_priv->display.crtc_compute_clock &&
            !crtc_state->bigjoiner_slave &&
            !drm_WARN_ON(&dev_priv->drm, crtc_state->shared_dpll)) {
                ret = dev_priv->display.crtc_compute_clock(crtc_state);
                if (ret)
                        return ret;
        }

        /*
         * May need to update pipe gamma enable bits
         * when C8 planes are getting enabled/disabled.
         */
        if (c8_planes_changed(crtc_state))
                crtc_state->uapi.color_mgmt_changed = true;

        if (mode_changed || crtc_state->update_pipe ||
            crtc_state->uapi.color_mgmt_changed) {
                ret = intel_color_check(crtc_state);
                if (ret)
                        return ret;
        }

        if (dev_priv->display.compute_pipe_wm) {
                ret = dev_priv->display.compute_pipe_wm(state, crtc);
                if (ret) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "Target pipe watermarks are invalid\n");
                        return ret;
                }

        }

        if (dev_priv->display.compute_intermediate_wm) {
                if (drm_WARN_ON(&dev_priv->drm,
                                !dev_priv->display.compute_pipe_wm))
                        return 0;

                /*
                 * Calculate 'intermediate' watermarks that satisfy both the
                 * old state and the new state.  We can program these
                 * immediately.
                 */
                ret = dev_priv->display.compute_intermediate_wm(state, crtc);
                if (ret) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "No valid intermediate pipe watermarks are possible\n");
                        return ret;
                }
        }

        if (DISPLAY_VER(dev_priv) >= 9) {
                if (mode_changed || crtc_state->update_pipe) {
                        ret = skl_update_scaler_crtc(crtc_state);
                        if (ret)
                                return ret;
                }

                ret = intel_atomic_setup_scalers(dev_priv, crtc, crtc_state);
                if (ret)
                        return ret;
        }

        if (HAS_IPS(dev_priv)) {
                ret = hsw_compute_ips_config(crtc_state);
                if (ret)
                        return ret;
        }

        if (DISPLAY_VER(dev_priv) >= 9 ||
            IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv)) {
                ret = hsw_compute_linetime_wm(state, crtc);
                if (ret)
                        return ret;

        }

        if (!mode_changed) {
                ret = intel_psr2_sel_fetch_update(state, crtc);
                if (ret)
                        return ret;
        }

        return 0;
}

static void intel_modeset_update_connector_atomic_state(struct drm_device *dev)
{
        struct intel_connector *connector;
        struct drm_connector_list_iter conn_iter;

        drm_connector_list_iter_begin(dev, &conn_iter);
        for_each_intel_connector_iter(connector, &conn_iter) {
                struct drm_connector_state *conn_state = connector->base.state;
                struct intel_encoder *encoder =
                        to_intel_encoder(connector->base.encoder);

                if (conn_state->crtc)
                        drm_connector_put(&connector->base);

                if (encoder) {
                        struct intel_crtc *crtc =
                                to_intel_crtc(encoder->base.crtc);
                        const struct intel_crtc_state *crtc_state =
                                to_intel_crtc_state(crtc->base.state);

                        conn_state->best_encoder = &encoder->base;
                        conn_state->crtc = &crtc->base;
                        conn_state->max_bpc = (crtc_state->pipe_bpp ?: 24) / 3;

                        drm_connector_get(&connector->base);
                } else {
                        conn_state->best_encoder = NULL;
                        conn_state->crtc = NULL;
                }
        }
        drm_connector_list_iter_end(&conn_iter);
}

static int
compute_sink_pipe_bpp(const struct drm_connector_state *conn_state,
                      struct intel_crtc_state *pipe_config)
{
        struct drm_connector *connector = conn_state->connector;
        struct drm_i915_private *i915 = to_i915(pipe_config->uapi.crtc->dev);
        const struct drm_display_info *info = &connector->display_info;
        int bpp;

        switch (conn_state->max_bpc) {
        case 6 ... 7:
                bpp = 6 * 3;
                break;
        case 8 ... 9:
                bpp = 8 * 3;
                break;
        case 10 ... 11:
                bpp = 10 * 3;
                break;
        case 12 ... 16:
                bpp = 12 * 3;
                break;
        default:
                MISSING_CASE(conn_state->max_bpc);
                return -EINVAL;
        }

        if (bpp < pipe_config->pipe_bpp) {
                drm_dbg_kms(&i915->drm,
                            "[CONNECTOR:%d:%s] Limiting display bpp to %d instead of "
                            "EDID bpp %d, requested bpp %d, max platform bpp %d\n",
                            connector->base.id, connector->name,
                            bpp, 3 * info->bpc,
                            3 * conn_state->max_requested_bpc,
                            pipe_config->pipe_bpp);

                pipe_config->pipe_bpp = bpp;
        }

        return 0;
}

static int
compute_baseline_pipe_bpp(struct intel_crtc *crtc,
                          struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct drm_atomic_state *state = pipe_config->uapi.state;
        struct drm_connector *connector;
        struct drm_connector_state *connector_state;
        int bpp, i;

        if ((IS_G4X(dev_priv) || IS_VALLEYVIEW(dev_priv) ||
            IS_CHERRYVIEW(dev_priv)))
                bpp = 10*3;
        else if (DISPLAY_VER(dev_priv) >= 5)
                bpp = 12*3;
        else
                bpp = 8*3;

        pipe_config->pipe_bpp = bpp;

        /* Clamp display bpp to connector max bpp */
        for_each_new_connector_in_state(state, connector, connector_state, i) {
                int ret;

                if (connector_state->crtc != &crtc->base)
                        continue;

                ret = compute_sink_pipe_bpp(connector_state, pipe_config);
                if (ret)
                        return ret;
        }

        return 0;
}

static void intel_dump_crtc_timings(struct drm_i915_private *i915,
                                    const struct drm_display_mode *mode)
{
        drm_dbg_kms(&i915->drm, "crtc timings: %d %d %d %d %d %d %d %d %d, "
                    "type: 0x%x flags: 0x%x\n",
                    mode->crtc_clock,
                    mode->crtc_hdisplay, mode->crtc_hsync_start,
                    mode->crtc_hsync_end, mode->crtc_htotal,
                    mode->crtc_vdisplay, mode->crtc_vsync_start,
                    mode->crtc_vsync_end, mode->crtc_vtotal,
                    mode->type, mode->flags);
}

static void
intel_dump_m_n_config(const struct intel_crtc_state *pipe_config,
                      const char *id, unsigned int lane_count,
                      const struct intel_link_m_n *m_n)
{
        struct drm_i915_private *i915 = to_i915(pipe_config->uapi.crtc->dev);

        drm_dbg_kms(&i915->drm,
                    "%s: lanes: %i; gmch_m: %u, gmch_n: %u, link_m: %u, link_n: %u, tu: %u\n",
                    id, lane_count,
                    m_n->gmch_m, m_n->gmch_n,
                    m_n->link_m, m_n->link_n, m_n->tu);
}

static void
intel_dump_infoframe(struct drm_i915_private *dev_priv,
                     const union hdmi_infoframe *frame)
{
        if (!drm_debug_enabled(DRM_UT_KMS))
                return;

        hdmi_infoframe_log(KERN_DEBUG, dev_priv->drm.dev, frame);
}

static void
intel_dump_dp_vsc_sdp(struct drm_i915_private *dev_priv,
                      const struct drm_dp_vsc_sdp *vsc)
{
        if (!drm_debug_enabled(DRM_UT_KMS))
                return;

        drm_dp_vsc_sdp_log(KERN_DEBUG, dev_priv->drm.dev, vsc);
}

#define OUTPUT_TYPE(x) [INTEL_OUTPUT_ ## x] = #x

static const char * const output_type_str[] = {
        OUTPUT_TYPE(UNUSED),
        OUTPUT_TYPE(ANALOG),
        OUTPUT_TYPE(DVO),
        OUTPUT_TYPE(SDVO),
        OUTPUT_TYPE(LVDS),
        OUTPUT_TYPE(TVOUT),
        OUTPUT_TYPE(HDMI),
        OUTPUT_TYPE(DP),
        OUTPUT_TYPE(EDP),
        OUTPUT_TYPE(DSI),
        OUTPUT_TYPE(DDI),
        OUTPUT_TYPE(DP_MST),
};

#undef OUTPUT_TYPE

static void snprintf_output_types(char *buf, size_t len,
                                  unsigned int output_types)
{
        char *str = buf;
        int i;

        str[0] = '\0';

        for (i = 0; i < ARRAY_SIZE(output_type_str); i++) {
                int r;

                if ((output_types & BIT(i)) == 0)
                        continue;

                r = snprintf(str, len, "%s%s",
                             str != buf ? "," : "", output_type_str[i]);
                if (r >= len)
                        break;
                str += r;
                len -= r;

                output_types &= ~BIT(i);
        }

        WARN_ON_ONCE(output_types != 0);
}

static const char * const output_format_str[] = {
        [INTEL_OUTPUT_FORMAT_RGB] = "RGB",
        [INTEL_OUTPUT_FORMAT_YCBCR420] = "YCBCR4:2:0",
        [INTEL_OUTPUT_FORMAT_YCBCR444] = "YCBCR4:4:4",
};

static const char *output_formats(enum intel_output_format format)
{
        if (format >= ARRAY_SIZE(output_format_str))
                return "invalid";
        return output_format_str[format];
}

static void intel_dump_plane_state(const struct intel_plane_state *plane_state)
{
        struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
        struct drm_i915_private *i915 = to_i915(plane->base.dev);
        const struct drm_framebuffer *fb = plane_state->hw.fb;

        if (!fb) {
                drm_dbg_kms(&i915->drm,
                            "[PLANE:%d:%s] fb: [NOFB], visible: %s\n",
                            plane->base.base.id, plane->base.name,
                            yesno(plane_state->uapi.visible));
                return;
        }

        drm_dbg_kms(&i915->drm,
                    "[PLANE:%d:%s] fb: [FB:%d] %ux%u format = %p4cc modifier = 0x%llx, visible: %s\n",
                    plane->base.base.id, plane->base.name,
                    fb->base.id, fb->width, fb->height, &fb->format->format,
                    fb->modifier, yesno(plane_state->uapi.visible));
        drm_dbg_kms(&i915->drm, "\trotation: 0x%x, scaler: %d\n",
                    plane_state->hw.rotation, plane_state->scaler_id);
        if (plane_state->uapi.visible)
                drm_dbg_kms(&i915->drm,
                            "\tsrc: " DRM_RECT_FP_FMT " dst: " DRM_RECT_FMT "\n",
                            DRM_RECT_FP_ARG(&plane_state->uapi.src),
                            DRM_RECT_ARG(&plane_state->uapi.dst));
}

static void intel_dump_pipe_config(const struct intel_crtc_state *pipe_config,
                                   struct intel_atomic_state *state,
                                   const char *context)
{
        struct intel_crtc *crtc = to_intel_crtc(pipe_config->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        const struct intel_plane_state *plane_state;
        struct intel_plane *plane;
        char buf[64];
        int i;

        drm_dbg_kms(&dev_priv->drm, "[CRTC:%d:%s] enable: %s %s\n",
                    crtc->base.base.id, crtc->base.name,
                    yesno(pipe_config->hw.enable), context);

        if (!pipe_config->hw.enable)
                goto dump_planes;

        snprintf_output_types(buf, sizeof(buf), pipe_config->output_types);
        drm_dbg_kms(&dev_priv->drm,
                    "active: %s, output_types: %s (0x%x), output format: %s\n",
                    yesno(pipe_config->hw.active),
                    buf, pipe_config->output_types,
                    output_formats(pipe_config->output_format));

        drm_dbg_kms(&dev_priv->drm,
                    "cpu_transcoder: %s, pipe bpp: %i, dithering: %i\n",
                    transcoder_name(pipe_config->cpu_transcoder),
                    pipe_config->pipe_bpp, pipe_config->dither);

        drm_dbg_kms(&dev_priv->drm, "MST master transcoder: %s\n",
                    transcoder_name(pipe_config->mst_master_transcoder));

        drm_dbg_kms(&dev_priv->drm,
                    "port sync: master transcoder: %s, slave transcoder bitmask = 0x%x\n",
                    transcoder_name(pipe_config->master_transcoder),
                    pipe_config->sync_mode_slaves_mask);

        drm_dbg_kms(&dev_priv->drm, "bigjoiner: %s\n",
                    pipe_config->bigjoiner_slave ? "slave" :
                    pipe_config->bigjoiner ? "master" : "no");

        drm_dbg_kms(&dev_priv->drm, "splitter: %s, link count %d, overlap %d\n",
                    enableddisabled(pipe_config->splitter.enable),
                    pipe_config->splitter.link_count,
                    pipe_config->splitter.pixel_overlap);

        if (pipe_config->has_pch_encoder)
                intel_dump_m_n_config(pipe_config, "fdi",
                                      pipe_config->fdi_lanes,
                                      &pipe_config->fdi_m_n);

        if (intel_crtc_has_dp_encoder(pipe_config)) {
                intel_dump_m_n_config(pipe_config, "dp m_n",
                                pipe_config->lane_count, &pipe_config->dp_m_n);
                if (pipe_config->has_drrs)
                        intel_dump_m_n_config(pipe_config, "dp m2_n2",
                                              pipe_config->lane_count,
                                              &pipe_config->dp_m2_n2);
        }

        drm_dbg_kms(&dev_priv->drm,
                    "audio: %i, infoframes: %i, infoframes enabled: 0x%x\n",
                    pipe_config->has_audio, pipe_config->has_infoframe,
                    pipe_config->infoframes.enable);

        if (pipe_config->infoframes.enable &
            intel_hdmi_infoframe_enable(HDMI_PACKET_TYPE_GENERAL_CONTROL))
                drm_dbg_kms(&dev_priv->drm, "GCP: 0x%x\n",
                            pipe_config->infoframes.gcp);
        if (pipe_config->infoframes.enable &
            intel_hdmi_infoframe_enable(HDMI_INFOFRAME_TYPE_AVI))
                intel_dump_infoframe(dev_priv, &pipe_config->infoframes.avi);
        if (pipe_config->infoframes.enable &
            intel_hdmi_infoframe_enable(HDMI_INFOFRAME_TYPE_SPD))
                intel_dump_infoframe(dev_priv, &pipe_config->infoframes.spd);
        if (pipe_config->infoframes.enable &
            intel_hdmi_infoframe_enable(HDMI_INFOFRAME_TYPE_VENDOR))
                intel_dump_infoframe(dev_priv, &pipe_config->infoframes.hdmi);
        if (pipe_config->infoframes.enable &
            intel_hdmi_infoframe_enable(HDMI_INFOFRAME_TYPE_DRM))
                intel_dump_infoframe(dev_priv, &pipe_config->infoframes.drm);
        if (pipe_config->infoframes.enable &
            intel_hdmi_infoframe_enable(HDMI_PACKET_TYPE_GAMUT_METADATA))
                intel_dump_infoframe(dev_priv, &pipe_config->infoframes.drm);
        if (pipe_config->infoframes.enable &
            intel_hdmi_infoframe_enable(DP_SDP_VSC))
                intel_dump_dp_vsc_sdp(dev_priv, &pipe_config->infoframes.vsc);

        drm_dbg_kms(&dev_priv->drm, "vrr: %s, vmin: %d, vmax: %d, pipeline full: %d, guardband: %d flipline: %d, vmin vblank: %d, vmax vblank: %d\n",
                    yesno(pipe_config->vrr.enable),
                    pipe_config->vrr.vmin, pipe_config->vrr.vmax,
                    pipe_config->vrr.pipeline_full, pipe_config->vrr.guardband,
                    pipe_config->vrr.flipline,
                    intel_vrr_vmin_vblank_start(pipe_config),
                    intel_vrr_vmax_vblank_start(pipe_config));

        drm_dbg_kms(&dev_priv->drm, "requested mode:\n");
        drm_mode_debug_printmodeline(&pipe_config->hw.mode);
        drm_dbg_kms(&dev_priv->drm, "adjusted mode:\n");
        drm_mode_debug_printmodeline(&pipe_config->hw.adjusted_mode);
        intel_dump_crtc_timings(dev_priv, &pipe_config->hw.adjusted_mode);
        drm_dbg_kms(&dev_priv->drm, "pipe mode:\n");
        drm_mode_debug_printmodeline(&pipe_config->hw.pipe_mode);
        intel_dump_crtc_timings(dev_priv, &pipe_config->hw.pipe_mode);
        drm_dbg_kms(&dev_priv->drm,
                    "port clock: %d, pipe src size: %dx%d, pixel rate %d\n",
                    pipe_config->port_clock,
                    pipe_config->pipe_src_w, pipe_config->pipe_src_h,
                    pipe_config->pixel_rate);

        drm_dbg_kms(&dev_priv->drm, "linetime: %d, ips linetime: %d\n",
                    pipe_config->linetime, pipe_config->ips_linetime);

        if (DISPLAY_VER(dev_priv) >= 9)
                drm_dbg_kms(&dev_priv->drm,
                            "num_scalers: %d, scaler_users: 0x%x, scaler_id: %d\n",
                            crtc->num_scalers,
                            pipe_config->scaler_state.scaler_users,
                            pipe_config->scaler_state.scaler_id);

        if (HAS_GMCH(dev_priv))
                drm_dbg_kms(&dev_priv->drm,
                            "gmch pfit: control: 0x%08x, ratios: 0x%08x, lvds border: 0x%08x\n",
                            pipe_config->gmch_pfit.control,
                            pipe_config->gmch_pfit.pgm_ratios,
                            pipe_config->gmch_pfit.lvds_border_bits);
        else
                drm_dbg_kms(&dev_priv->drm,
                            "pch pfit: " DRM_RECT_FMT ", %s, force thru: %s\n",
                            DRM_RECT_ARG(&pipe_config->pch_pfit.dst),
                            enableddisabled(pipe_config->pch_pfit.enabled),
                            yesno(pipe_config->pch_pfit.force_thru));

        drm_dbg_kms(&dev_priv->drm, "ips: %i, double wide: %i\n",
                    pipe_config->ips_enabled, pipe_config->double_wide);

        intel_dpll_dump_hw_state(dev_priv, &pipe_config->dpll_hw_state);

        if (IS_CHERRYVIEW(dev_priv))
                drm_dbg_kms(&dev_priv->drm,
                            "cgm_mode: 0x%x gamma_mode: 0x%x gamma_enable: %d csc_enable: %d\n",
                            pipe_config->cgm_mode, pipe_config->gamma_mode,
                            pipe_config->gamma_enable, pipe_config->csc_enable);
        else
                drm_dbg_kms(&dev_priv->drm,
                            "csc_mode: 0x%x gamma_mode: 0x%x gamma_enable: %d csc_enable: %d\n",
                            pipe_config->csc_mode, pipe_config->gamma_mode,
                            pipe_config->gamma_enable, pipe_config->csc_enable);

        drm_dbg_kms(&dev_priv->drm, "degamma lut: %d entries, gamma lut: %d entries\n",
                    pipe_config->hw.degamma_lut ?
                    drm_color_lut_size(pipe_config->hw.degamma_lut) : 0,
                    pipe_config->hw.gamma_lut ?
                    drm_color_lut_size(pipe_config->hw.gamma_lut) : 0);

dump_planes:
        if (!state)
                return;

        for_each_new_intel_plane_in_state(state, plane, plane_state, i) {
                if (plane->pipe == crtc->pipe)
                        intel_dump_plane_state(plane_state);
        }
}

static bool check_digital_port_conflicts(struct intel_atomic_state *state)
{
        struct drm_device *dev = state->base.dev;
        struct drm_connector *connector;
        struct drm_connector_list_iter conn_iter;
        unsigned int used_ports = 0;
        unsigned int used_mst_ports = 0;
        bool ret = true;

        /*
         * We're going to peek into connector->state,
         * hence connection_mutex must be held.
         */
        drm_modeset_lock_assert_held(&dev->mode_config.connection_mutex);

        /*
         * Walk the connector list instead of the encoder
         * list to detect the problem on ddi platforms
         * where there's just one encoder per digital port.
         */
        drm_connector_list_iter_begin(dev, &conn_iter);
        drm_for_each_connector_iter(connector, &conn_iter) {
                struct drm_connector_state *connector_state;
                struct intel_encoder *encoder;

                connector_state =
                        drm_atomic_get_new_connector_state(&state->base,
                                                           connector);
                if (!connector_state)
                        connector_state = connector->state;

                if (!connector_state->best_encoder)
                        continue;

                encoder = to_intel_encoder(connector_state->best_encoder);

                drm_WARN_ON(dev, !connector_state->crtc);

                switch (encoder->type) {
                case INTEL_OUTPUT_DDI:
                        if (drm_WARN_ON(dev, !HAS_DDI(to_i915(dev))))
                                break;
                        fallthrough;
                case INTEL_OUTPUT_DP:
                case INTEL_OUTPUT_HDMI:
                case INTEL_OUTPUT_EDP:
                        /* the same port mustn't appear more than once */
                        if (used_ports & BIT(encoder->port))
                                ret = false;

                        used_ports |= BIT(encoder->port);
                        break;
                case INTEL_OUTPUT_DP_MST:
                        used_mst_ports |=
                                1 << encoder->port;
                        break;
                default:
                        break;
                }
        }
        drm_connector_list_iter_end(&conn_iter);

        /* can't mix MST and SST/HDMI on the same port */
        if (used_ports & used_mst_ports)
                return false;

        return ret;
}

static void
intel_crtc_copy_uapi_to_hw_state_nomodeset(struct intel_atomic_state *state,
                                           struct intel_crtc_state *crtc_state)
{
        const struct intel_crtc_state *from_crtc_state = crtc_state;

        if (crtc_state->bigjoiner_slave) {
                from_crtc_state = intel_atomic_get_new_crtc_state(state,
                                                                  crtc_state->bigjoiner_linked_crtc);

                /* No need to copy state if the master state is unchanged */
                if (!from_crtc_state)
                        return;
        }

        intel_crtc_copy_color_blobs(crtc_state, from_crtc_state);
}

static void
intel_crtc_copy_uapi_to_hw_state(struct intel_atomic_state *state,
                                 struct intel_crtc_state *crtc_state)
{
        crtc_state->hw.enable = crtc_state->uapi.enable;
        crtc_state->hw.active = crtc_state->uapi.active;
        crtc_state->hw.mode = crtc_state->uapi.mode;
        crtc_state->hw.adjusted_mode = crtc_state->uapi.adjusted_mode;
        crtc_state->hw.scaling_filter = crtc_state->uapi.scaling_filter;

        intel_crtc_copy_uapi_to_hw_state_nomodeset(state, crtc_state);
}

static void intel_crtc_copy_hw_to_uapi_state(struct intel_crtc_state *crtc_state)
{
        if (crtc_state->bigjoiner_slave)
                return;

        crtc_state->uapi.enable = crtc_state->hw.enable;
        crtc_state->uapi.active = crtc_state->hw.active;
        drm_WARN_ON(crtc_state->uapi.crtc->dev,
                    drm_atomic_set_mode_for_crtc(&crtc_state->uapi, &crtc_state->hw.mode) < 0);

        crtc_state->uapi.adjusted_mode = crtc_state->hw.adjusted_mode;
        crtc_state->uapi.scaling_filter = crtc_state->hw.scaling_filter;

        /* copy color blobs to uapi */
        drm_property_replace_blob(&crtc_state->uapi.degamma_lut,
                                  crtc_state->hw.degamma_lut);
        drm_property_replace_blob(&crtc_state->uapi.gamma_lut,
                                  crtc_state->hw.gamma_lut);
        drm_property_replace_blob(&crtc_state->uapi.ctm,
                                  crtc_state->hw.ctm);
}

static int
copy_bigjoiner_crtc_state(struct intel_crtc_state *crtc_state,
                          const struct intel_crtc_state *from_crtc_state)
{
        struct intel_crtc_state *saved_state;
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);

        saved_state = kmemdup(from_crtc_state, sizeof(*saved_state), GFP_KERNEL);
        if (!saved_state)
                return -ENOMEM;

        saved_state->uapi = crtc_state->uapi;
        saved_state->scaler_state = crtc_state->scaler_state;
        saved_state->shared_dpll = crtc_state->shared_dpll;
        saved_state->dpll_hw_state = crtc_state->dpll_hw_state;
        saved_state->crc_enabled = crtc_state->crc_enabled;

        intel_crtc_free_hw_state(crtc_state);
        memcpy(crtc_state, saved_state, sizeof(*crtc_state));
        kfree(saved_state);

        /* Re-init hw state */
        memset(&crtc_state->hw, 0, sizeof(saved_state->hw));
        crtc_state->hw.enable = from_crtc_state->hw.enable;
        crtc_state->hw.active = from_crtc_state->hw.active;
        crtc_state->hw.pipe_mode = from_crtc_state->hw.pipe_mode;
        crtc_state->hw.adjusted_mode = from_crtc_state->hw.adjusted_mode;

        /* Some fixups */
        crtc_state->uapi.mode_changed = from_crtc_state->uapi.mode_changed;
        crtc_state->uapi.connectors_changed = from_crtc_state->uapi.connectors_changed;
        crtc_state->uapi.active_changed = from_crtc_state->uapi.active_changed;
        crtc_state->nv12_planes = crtc_state->c8_planes = crtc_state->update_planes = 0;
        crtc_state->bigjoiner_linked_crtc = to_intel_crtc(from_crtc_state->uapi.crtc);
        crtc_state->bigjoiner_slave = true;
        crtc_state->cpu_transcoder = (enum transcoder)crtc->pipe;
        crtc_state->has_audio = false;

        return 0;
}

static int
intel_crtc_prepare_cleared_state(struct intel_atomic_state *state,
                                 struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct intel_crtc_state *saved_state;

        saved_state = intel_crtc_state_alloc(crtc);
        if (!saved_state)
                return -ENOMEM;

        /* free the old crtc_state->hw members */
        intel_crtc_free_hw_state(crtc_state);

        /* FIXME: before the switch to atomic started, a new pipe_config was
         * kzalloc'd. Code that depends on any field being zero should be
         * fixed, so that the crtc_state can be safely duplicated. For now,
         * only fields that are know to not cause problems are preserved. */

        saved_state->uapi = crtc_state->uapi;
        saved_state->scaler_state = crtc_state->scaler_state;
        saved_state->shared_dpll = crtc_state->shared_dpll;
        saved_state->dpll_hw_state = crtc_state->dpll_hw_state;
        memcpy(saved_state->icl_port_dplls, crtc_state->icl_port_dplls,
               sizeof(saved_state->icl_port_dplls));
        saved_state->crc_enabled = crtc_state->crc_enabled;
        if (IS_G4X(dev_priv) ||
            IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
                saved_state->wm = crtc_state->wm;

        memcpy(crtc_state, saved_state, sizeof(*crtc_state));
        kfree(saved_state);

        intel_crtc_copy_uapi_to_hw_state(state, crtc_state);

        return 0;
}

static int
intel_modeset_pipe_config(struct intel_atomic_state *state,
                          struct intel_crtc_state *pipe_config)
{
        struct drm_crtc *crtc = pipe_config->uapi.crtc;
        struct drm_i915_private *i915 = to_i915(pipe_config->uapi.crtc->dev);
        struct drm_connector *connector;
        struct drm_connector_state *connector_state;
        int base_bpp, ret, i;
        bool retry = true;

        pipe_config->cpu_transcoder =
                (enum transcoder) to_intel_crtc(crtc)->pipe;

        /*
         * Sanitize sync polarity flags based on requested ones. If neither
         * positive or negative polarity is requested, treat this as meaning
         * negative polarity.
         */
        if (!(pipe_config->hw.adjusted_mode.flags &
              (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NHSYNC)))
                pipe_config->hw.adjusted_mode.flags |= DRM_MODE_FLAG_NHSYNC;

        if (!(pipe_config->hw.adjusted_mode.flags &
              (DRM_MODE_FLAG_PVSYNC | DRM_MODE_FLAG_NVSYNC)))
                pipe_config->hw.adjusted_mode.flags |= DRM_MODE_FLAG_NVSYNC;

        ret = compute_baseline_pipe_bpp(to_intel_crtc(crtc),
                                        pipe_config);
        if (ret)
                return ret;

        base_bpp = pipe_config->pipe_bpp;

        /*
         * Determine the real pipe dimensions. Note that stereo modes can
         * increase the actual pipe size due to the frame doubling and
         * insertion of additional space for blanks between the frame. This
         * is stored in the crtc timings. We use the requested mode to do this
         * computation to clearly distinguish it from the adjusted mode, which
         * can be changed by the connectors in the below retry loop.
         */
        drm_mode_get_hv_timing(&pipe_config->hw.mode,
                               &pipe_config->pipe_src_w,
                               &pipe_config->pipe_src_h);

        for_each_new_connector_in_state(&state->base, connector, connector_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(connector_state->best_encoder);

                if (connector_state->crtc != crtc)
                        continue;

                if (!check_single_encoder_cloning(state, to_intel_crtc(crtc), encoder)) {
                        drm_dbg_kms(&i915->drm,
                                    "rejecting invalid cloning configuration\n");
                        return -EINVAL;
                }

                /*
                 * Determine output_types before calling the .compute_config()
                 * hooks so that the hooks can use this information safely.
                 */
                if (encoder->compute_output_type)
                        pipe_config->output_types |=
                                BIT(encoder->compute_output_type(encoder, pipe_config,
                                                                 connector_state));
                else
                        pipe_config->output_types |= BIT(encoder->type);
        }

encoder_retry:
        /* Ensure the port clock defaults are reset when retrying. */
        pipe_config->port_clock = 0;
        pipe_config->pixel_multiplier = 1;

        /* Fill in default crtc timings, allow encoders to overwrite them. */
        drm_mode_set_crtcinfo(&pipe_config->hw.adjusted_mode,
                              CRTC_STEREO_DOUBLE);

        /* Pass our mode to the connectors and the CRTC to give them a chance to
         * adjust it according to limitations or connector properties, and also
         * a chance to reject the mode entirely.
         */
        for_each_new_connector_in_state(&state->base, connector, connector_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(connector_state->best_encoder);

                if (connector_state->crtc != crtc)
                        continue;

                ret = encoder->compute_config(encoder, pipe_config,
                                              connector_state);
                if (ret < 0) {
                        if (ret != -EDEADLK)
                                drm_dbg_kms(&i915->drm,
                                            "Encoder config failure: %d\n",
                                            ret);
                        return ret;
                }
        }

        /* Set default port clock if not overwritten by the encoder. Needs to be
         * done afterwards in case the encoder adjusts the mode. */
        if (!pipe_config->port_clock)
                pipe_config->port_clock = pipe_config->hw.adjusted_mode.crtc_clock
                        * pipe_config->pixel_multiplier;

        ret = intel_crtc_compute_config(to_intel_crtc(crtc), pipe_config);
        if (ret == -EDEADLK)
                return ret;
        if (ret < 0) {
                drm_dbg_kms(&i915->drm, "CRTC fixup failed\n");
                return ret;
        }

        if (ret == I915_DISPLAY_CONFIG_RETRY) {
                if (drm_WARN(&i915->drm, !retry,
                             "loop in pipe configuration computation\n"))
                        return -EINVAL;

                drm_dbg_kms(&i915->drm, "CRTC bw constrained, retrying\n");
                retry = false;
                goto encoder_retry;
        }

        /* Dithering seems to not pass-through bits correctly when it should, so
         * only enable it on 6bpc panels and when its not a compliance
         * test requesting 6bpc video pattern.
         */
        pipe_config->dither = (pipe_config->pipe_bpp == 6*3) &&
                !pipe_config->dither_force_disable;
        drm_dbg_kms(&i915->drm,
                    "hw max bpp: %i, pipe bpp: %i, dithering: %i\n",
                    base_bpp, pipe_config->pipe_bpp, pipe_config->dither);

        return 0;
}

static int
intel_modeset_pipe_config_late(struct intel_crtc_state *crtc_state)
{
        struct intel_atomic_state *state =
                to_intel_atomic_state(crtc_state->uapi.state);
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_connector_state *conn_state;
        struct drm_connector *connector;
        int i;

        for_each_new_connector_in_state(&state->base, connector,
                                        conn_state, i) {
                struct intel_encoder *encoder =
                        to_intel_encoder(conn_state->best_encoder);
                int ret;

                if (conn_state->crtc != &crtc->base ||
                    !encoder->compute_config_late)
                        continue;

                ret = encoder->compute_config_late(encoder, crtc_state,
                                                   conn_state);
                if (ret)
                        return ret;
        }

        return 0;
}

bool intel_fuzzy_clock_check(int clock1, int clock2)
{
        int diff;

        if (clock1 == clock2)
                return true;

        if (!clock1 || !clock2)
                return false;

        diff = abs(clock1 - clock2);

        if (((((diff + clock1 + clock2) * 100)) / (clock1 + clock2)) < 105)
                return true;

        return false;
}

static bool
intel_compare_m_n(unsigned int m, unsigned int n,
                  unsigned int m2, unsigned int n2,
                  bool exact)
{
        if (m == m2 && n == n2)
                return true;

        if (exact || !m || !n || !m2 || !n2)
                return false;

        BUILD_BUG_ON(DATA_LINK_M_N_MASK > INT_MAX);

        if (n > n2) {
                while (n > n2) {
                        m2 <<= 1;
                        n2 <<= 1;
                }
        } else if (n < n2) {
                while (n < n2) {
                        m <<= 1;
                        n <<= 1;
                }
        }

        if (n != n2)
                return false;

        return intel_fuzzy_clock_check(m, m2);
}

static bool
intel_compare_link_m_n(const struct intel_link_m_n *m_n,
                       const struct intel_link_m_n *m2_n2,
                       bool exact)
{
        return m_n->tu == m2_n2->tu &&
                intel_compare_m_n(m_n->gmch_m, m_n->gmch_n,
                                  m2_n2->gmch_m, m2_n2->gmch_n, exact) &&
                intel_compare_m_n(m_n->link_m, m_n->link_n,
                                  m2_n2->link_m, m2_n2->link_n, exact);
}

static bool
intel_compare_infoframe(const union hdmi_infoframe *a,
                        const union hdmi_infoframe *b)
{
        return memcmp(a, b, sizeof(*a)) == 0;
}

static bool
intel_compare_dp_vsc_sdp(const struct drm_dp_vsc_sdp *a,
                         const struct drm_dp_vsc_sdp *b)
{
        return memcmp(a, b, sizeof(*a)) == 0;
}

static void
pipe_config_infoframe_mismatch(struct drm_i915_private *dev_priv,
                               bool fastset, const char *name,
                               const union hdmi_infoframe *a,
                               const union hdmi_infoframe *b)
{
        if (fastset) {
                if (!drm_debug_enabled(DRM_UT_KMS))
                        return;

                drm_dbg_kms(&dev_priv->drm,
                            "fastset mismatch in %s infoframe\n", name);
                drm_dbg_kms(&dev_priv->drm, "expected:\n");
                hdmi_infoframe_log(KERN_DEBUG, dev_priv->drm.dev, a);
                drm_dbg_kms(&dev_priv->drm, "found:\n");
                hdmi_infoframe_log(KERN_DEBUG, dev_priv->drm.dev, b);
        } else {
                drm_err(&dev_priv->drm, "mismatch in %s infoframe\n", name);
                drm_err(&dev_priv->drm, "expected:\n");
                hdmi_infoframe_log(KERN_ERR, dev_priv->drm.dev, a);
                drm_err(&dev_priv->drm, "found:\n");
                hdmi_infoframe_log(KERN_ERR, dev_priv->drm.dev, b);
        }
}

static void
pipe_config_dp_vsc_sdp_mismatch(struct drm_i915_private *dev_priv,
                                bool fastset, const char *name,
                                const struct drm_dp_vsc_sdp *a,
                                const struct drm_dp_vsc_sdp *b)
{
        if (fastset) {
                if (!drm_debug_enabled(DRM_UT_KMS))
                        return;

                drm_dbg_kms(&dev_priv->drm,
                            "fastset mismatch in %s dp sdp\n", name);
                drm_dbg_kms(&dev_priv->drm, "expected:\n");
                drm_dp_vsc_sdp_log(KERN_DEBUG, dev_priv->drm.dev, a);
                drm_dbg_kms(&dev_priv->drm, "found:\n");
                drm_dp_vsc_sdp_log(KERN_DEBUG, dev_priv->drm.dev, b);
        } else {
                drm_err(&dev_priv->drm, "mismatch in %s dp sdp\n", name);
                drm_err(&dev_priv->drm, "expected:\n");
                drm_dp_vsc_sdp_log(KERN_ERR, dev_priv->drm.dev, a);
                drm_err(&dev_priv->drm, "found:\n");
                drm_dp_vsc_sdp_log(KERN_ERR, dev_priv->drm.dev, b);
        }
}

static void __printf(4, 5)
pipe_config_mismatch(bool fastset, const struct intel_crtc *crtc,
                     const char *name, const char *format, ...)
{
        struct drm_i915_private *i915 = to_i915(crtc->base.dev);
        struct va_format vaf;
        va_list args;

        va_start(args, format);
        vaf.fmt = format;
        vaf.va = &args;

        if (fastset)
                drm_dbg_kms(&i915->drm,
                            "[CRTC:%d:%s] fastset mismatch in %s %pV\n",
                            crtc->base.base.id, crtc->base.name, name, &vaf);
        else
                drm_err(&i915->drm, "[CRTC:%d:%s] mismatch in %s %pV\n",
                        crtc->base.base.id, crtc->base.name, name, &vaf);

        va_end(args);
}

static bool fastboot_enabled(struct drm_i915_private *dev_priv)
{
        if (dev_priv->params.fastboot != -1)
                return dev_priv->params.fastboot;

        /* Enable fastboot by default on Skylake and newer */
        if (DISPLAY_VER(dev_priv) >= 9)
                return true;

        /* Enable fastboot by default on VLV and CHV */
        if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
                return true;

        /* Disabled by default on all others */
        return false;
}

static bool
intel_pipe_config_compare(const struct intel_crtc_state *current_config,
                          const struct intel_crtc_state *pipe_config,
                          bool fastset)
{
        struct drm_i915_private *dev_priv = to_i915(current_config->uapi.crtc->dev);
        struct intel_crtc *crtc = to_intel_crtc(pipe_config->uapi.crtc);
        bool ret = true;
        u32 bp_gamma = 0;
        bool fixup_inherited = fastset &&
                current_config->inherited && !pipe_config->inherited;

        if (fixup_inherited && !fastboot_enabled(dev_priv)) {
                drm_dbg_kms(&dev_priv->drm,
                            "initial modeset and fastboot not set\n");
                ret = false;
        }

#define PIPE_CONF_CHECK_X(name) do { \
        if (current_config->name != pipe_config->name) { \
                pipe_config_mismatch(fastset, crtc, __stringify(name), \
                                     "(expected 0x%08x, found 0x%08x)", \
                                     current_config->name, \
                                     pipe_config->name); \
                ret = false; \
        } \
} while (0)

#define PIPE_CONF_CHECK_X_WITH_MASK(name, mask) do { \
        if ((current_config->name & (mask)) != (pipe_config->name & (mask))) { \
                pipe_config_mismatch(fastset, crtc, __stringify(name), \
                                     "(expected 0x%08x, found 0x%08x)", \
                                     current_config->name & (mask), \
                                     pipe_config->name & (mask)); \
                ret = false; \
        } \
} while (0)

#define PIPE_CONF_CHECK_I(name) do { \
        if (current_config->name != pipe_config->name) { \
                pipe_config_mismatch(fastset, crtc, __stringify(name), \
                                     "(expected %i, found %i)", \
                                     current_config->name, \
                                     pipe_config->name); \
                ret = false; \
        } \
} while (0)

#define PIPE_CONF_CHECK_BOOL(name) do { \
        if (current_config->name != pipe_config->name) { \
                pipe_config_mismatch(fastset, crtc,  __stringify(name), \
                                     "(expected %s, found %s)", \
                                     yesno(current_config->name), \
                                     yesno(pipe_config->name)); \
                ret = false; \
        } \
} while (0)

/*
 * Checks state where we only read out the enabling, but not the entire
 * state itself (like full infoframes or ELD for audio). These states
 * require a full modeset on bootup to fix up.
 */
#define PIPE_CONF_CHECK_BOOL_INCOMPLETE(name) do { \
        if (!fixup_inherited || (!current_config->name && !pipe_config->name)) { \
                PIPE_CONF_CHECK_BOOL(name); \
        } else { \
                pipe_config_mismatch(fastset, crtc, __stringify(name), \
                                     "unable to verify whether state matches exactly, forcing modeset (expected %s, found %s)", \
                                     yesno(current_config->name), \
                                     yesno(pipe_config->name)); \
                ret = false; \
        } \
} while (0)

#define PIPE_CONF_CHECK_P(name) do { \
        if (current_config->name != pipe_config->name) { \
                pipe_config_mismatch(fastset, crtc, __stringify(name), \
                                     "(expected %p, found %p)", \
                                     current_config->name, \
                                     pipe_config->name); \
                ret = false; \
        } \
} while (0)

#define PIPE_CONF_CHECK_M_N(name) do { \
        if (!intel_compare_link_m_n(&current_config->name, \
                                    &pipe_config->name,\
                                    !fastset)) { \
                pipe_config_mismatch(fastset, crtc, __stringify(name), \
                                     "(expected tu %i gmch %i/%i link %i/%i, " \
                                     "found tu %i, gmch %i/%i link %i/%i)", \
                                     current_config->name.tu, \
                                     current_config->name.gmch_m, \
                                     current_config->name.gmch_n, \
                                     current_config->name.link_m, \
                                     current_config->name.link_n, \
                                     pipe_config->name.tu, \
                                     pipe_config->name.gmch_m, \
                                     pipe_config->name.gmch_n, \
                                     pipe_config->name.link_m, \
                                     pipe_config->name.link_n); \
                ret = false; \
        } \
} while (0)

/* This is required for BDW+ where there is only one set of registers for
 * switching between high and low RR.
 * This macro can be used whenever a comparison has to be made between one
 * hw state and multiple sw state variables.
 */
#define PIPE_CONF_CHECK_M_N_ALT(name, alt_name) do { \
        if (!intel_compare_link_m_n(&current_config->name, \
                                    &pipe_config->name, !fastset) && \
            !intel_compare_link_m_n(&current_config->alt_name, \
                                    &pipe_config->name, !fastset)) { \
                pipe_config_mismatch(fastset, crtc, __stringify(name), \
                                     "(expected tu %i gmch %i/%i link %i/%i, " \
                                     "or tu %i gmch %i/%i link %i/%i, " \
                                     "found tu %i, gmch %i/%i link %i/%i)", \
                                     current_config->name.tu, \
                                     current_config->name.gmch_m, \
                                     current_config->name.gmch_n, \
                                     current_config->name.link_m, \
                                     current_config->name.link_n, \
                                     current_config->alt_name.tu, \
                                     current_config->alt_name.gmch_m, \
                                     current_config->alt_name.gmch_n, \
                                     current_config->alt_name.link_m, \
                                     current_config->alt_name.link_n, \
                                     pipe_config->name.tu, \
                                     pipe_config->name.gmch_m, \
                                     pipe_config->name.gmch_n, \
                                     pipe_config->name.link_m, \
                                     pipe_config->name.link_n); \
                ret = false; \
        } \
} while (0)

#define PIPE_CONF_CHECK_FLAGS(name, mask) do { \
        if ((current_config->name ^ pipe_config->name) & (mask)) { \
                pipe_config_mismatch(fastset, crtc, __stringify(name), \
                                     "(%x) (expected %i, found %i)", \
                                     (mask), \
                                     current_config->name & (mask), \
                                     pipe_config->name & (mask)); \
                ret = false; \
        } \
} while (0)

#define PIPE_CONF_CHECK_CLOCK_FUZZY(name) do { \
        if (!intel_fuzzy_clock_check(current_config->name, pipe_config->name)) { \
                pipe_config_mismatch(fastset, crtc, __stringify(name), \
                                     "(expected %i, found %i)", \
                                     current_config->name, \
                                     pipe_config->name); \
                ret = false; \
        } \
} while (0)

#define PIPE_CONF_CHECK_INFOFRAME(name) do { \
        if (!intel_compare_infoframe(&current_config->infoframes.name, \
                                     &pipe_config->infoframes.name)) { \
                pipe_config_infoframe_mismatch(dev_priv, fastset, __stringify(name), \
                                               &current_config->infoframes.name, \
                                               &pipe_config->infoframes.name); \
                ret = false; \
        } \
} while (0)

#define PIPE_CONF_CHECK_DP_VSC_SDP(name) do { \
        if (!current_config->has_psr && !pipe_config->has_psr && \
            !intel_compare_dp_vsc_sdp(&current_config->infoframes.name, \
                                      &pipe_config->infoframes.name)) { \
                pipe_config_dp_vsc_sdp_mismatch(dev_priv, fastset, __stringify(name), \
                                                &current_config->infoframes.name, \
                                                &pipe_config->infoframes.name); \
                ret = false; \
        } \
} while (0)

#define PIPE_CONF_CHECK_COLOR_LUT(name1, name2, bit_precision) do { \
        if (current_config->name1 != pipe_config->name1) { \
                pipe_config_mismatch(fastset, crtc, __stringify(name1), \
                                "(expected %i, found %i, won't compare lut values)", \
                                current_config->name1, \
                                pipe_config->name1); \
                ret = false;\
        } else { \
                if (!intel_color_lut_equal(current_config->name2, \
                                        pipe_config->name2, pipe_config->name1, \
                                        bit_precision)) { \
                        pipe_config_mismatch(fastset, crtc, __stringify(name2), \
                                        "hw_state doesn't match sw_state"); \
                        ret = false; \
                } \
        } \
} while (0)

#define PIPE_CONF_QUIRK(quirk) \
        ((current_config->quirks | pipe_config->quirks) & (quirk))

        PIPE_CONF_CHECK_I(cpu_transcoder);

        PIPE_CONF_CHECK_BOOL(has_pch_encoder);
        PIPE_CONF_CHECK_I(fdi_lanes);
        PIPE_CONF_CHECK_M_N(fdi_m_n);

        PIPE_CONF_CHECK_I(lane_count);
        PIPE_CONF_CHECK_X(lane_lat_optim_mask);

        if (DISPLAY_VER(dev_priv) < 8) {
                PIPE_CONF_CHECK_M_N(dp_m_n);

                if (current_config->has_drrs)
                        PIPE_CONF_CHECK_M_N(dp_m2_n2);
        } else
                PIPE_CONF_CHECK_M_N_ALT(dp_m_n, dp_m2_n2);

        PIPE_CONF_CHECK_X(output_types);

        /* FIXME do the readout properly and get rid of this quirk */
        if (!PIPE_CONF_QUIRK(PIPE_CONFIG_QUIRK_BIGJOINER_SLAVE)) {
                PIPE_CONF_CHECK_I(hw.pipe_mode.crtc_hdisplay);
                PIPE_CONF_CHECK_I(hw.pipe_mode.crtc_htotal);
                PIPE_CONF_CHECK_I(hw.pipe_mode.crtc_hblank_start);
                PIPE_CONF_CHECK_I(hw.pipe_mode.crtc_hblank_end);
                PIPE_CONF_CHECK_I(hw.pipe_mode.crtc_hsync_start);
                PIPE_CONF_CHECK_I(hw.pipe_mode.crtc_hsync_end);

                PIPE_CONF_CHECK_I(hw.pipe_mode.crtc_vdisplay);
                PIPE_CONF_CHECK_I(hw.pipe_mode.crtc_vtotal);
                PIPE_CONF_CHECK_I(hw.pipe_mode.crtc_vblank_start);
                PIPE_CONF_CHECK_I(hw.pipe_mode.crtc_vblank_end);
                PIPE_CONF_CHECK_I(hw.pipe_mode.crtc_vsync_start);
                PIPE_CONF_CHECK_I(hw.pipe_mode.crtc_vsync_end);

                PIPE_CONF_CHECK_I(hw.adjusted_mode.crtc_hdisplay);
                PIPE_CONF_CHECK_I(hw.adjusted_mode.crtc_htotal);
                PIPE_CONF_CHECK_I(hw.adjusted_mode.crtc_hblank_start);
                PIPE_CONF_CHECK_I(hw.adjusted_mode.crtc_hblank_end);
                PIPE_CONF_CHECK_I(hw.adjusted_mode.crtc_hsync_start);
                PIPE_CONF_CHECK_I(hw.adjusted_mode.crtc_hsync_end);

                PIPE_CONF_CHECK_I(hw.adjusted_mode.crtc_vdisplay);
                PIPE_CONF_CHECK_I(hw.adjusted_mode.crtc_vtotal);
                PIPE_CONF_CHECK_I(hw.adjusted_mode.crtc_vblank_start);
                PIPE_CONF_CHECK_I(hw.adjusted_mode.crtc_vblank_end);
                PIPE_CONF_CHECK_I(hw.adjusted_mode.crtc_vsync_start);
                PIPE_CONF_CHECK_I(hw.adjusted_mode.crtc_vsync_end);

                PIPE_CONF_CHECK_I(pixel_multiplier);

                PIPE_CONF_CHECK_FLAGS(hw.adjusted_mode.flags,
                                      DRM_MODE_FLAG_INTERLACE);

                if (!PIPE_CONF_QUIRK(PIPE_CONFIG_QUIRK_MODE_SYNC_FLAGS)) {
                        PIPE_CONF_CHECK_FLAGS(hw.adjusted_mode.flags,
                                              DRM_MODE_FLAG_PHSYNC);
                        PIPE_CONF_CHECK_FLAGS(hw.adjusted_mode.flags,
                                              DRM_MODE_FLAG_NHSYNC);
                        PIPE_CONF_CHECK_FLAGS(hw.adjusted_mode.flags,
                                              DRM_MODE_FLAG_PVSYNC);
                        PIPE_CONF_CHECK_FLAGS(hw.adjusted_mode.flags,
                                              DRM_MODE_FLAG_NVSYNC);
                }
        }

        PIPE_CONF_CHECK_I(output_format);
        PIPE_CONF_CHECK_BOOL(has_hdmi_sink);
        if ((DISPLAY_VER(dev_priv) < 8 && !IS_HASWELL(dev_priv)) ||
            IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
                PIPE_CONF_CHECK_BOOL(limited_color_range);

        PIPE_CONF_CHECK_BOOL(hdmi_scrambling);
        PIPE_CONF_CHECK_BOOL(hdmi_high_tmds_clock_ratio);
        PIPE_CONF_CHECK_BOOL(has_infoframe);
        /* FIXME do the readout properly and get rid of this quirk */
        if (!PIPE_CONF_QUIRK(PIPE_CONFIG_QUIRK_BIGJOINER_SLAVE))
                PIPE_CONF_CHECK_BOOL(fec_enable);

        PIPE_CONF_CHECK_BOOL_INCOMPLETE(has_audio);

        PIPE_CONF_CHECK_X(gmch_pfit.control);
        /* pfit ratios are autocomputed by the hw on gen4+ */
        if (DISPLAY_VER(dev_priv) < 4)
                PIPE_CONF_CHECK_X(gmch_pfit.pgm_ratios);
        PIPE_CONF_CHECK_X(gmch_pfit.lvds_border_bits);

        /*
         * Changing the EDP transcoder input mux
         * (A_ONOFF vs. A_ON) requires a full modeset.
         */
        PIPE_CONF_CHECK_BOOL(pch_pfit.force_thru);

        if (!fastset) {
                PIPE_CONF_CHECK_I(pipe_src_w);
                PIPE_CONF_CHECK_I(pipe_src_h);

                PIPE_CONF_CHECK_BOOL(pch_pfit.enabled);
                if (current_config->pch_pfit.enabled) {
                        PIPE_CONF_CHECK_I(pch_pfit.dst.x1);
                        PIPE_CONF_CHECK_I(pch_pfit.dst.y1);
                        PIPE_CONF_CHECK_I(pch_pfit.dst.x2);
                        PIPE_CONF_CHECK_I(pch_pfit.dst.y2);
                }

                PIPE_CONF_CHECK_I(scaler_state.scaler_id);
                /* FIXME do the readout properly and get rid of this quirk */
                if (!PIPE_CONF_QUIRK(PIPE_CONFIG_QUIRK_BIGJOINER_SLAVE))
                        PIPE_CONF_CHECK_CLOCK_FUZZY(pixel_rate);

                PIPE_CONF_CHECK_X(gamma_mode);
                if (IS_CHERRYVIEW(dev_priv))
                        PIPE_CONF_CHECK_X(cgm_mode);
                else
                        PIPE_CONF_CHECK_X(csc_mode);
                PIPE_CONF_CHECK_BOOL(gamma_enable);
                PIPE_CONF_CHECK_BOOL(csc_enable);

                PIPE_CONF_CHECK_I(linetime);
                PIPE_CONF_CHECK_I(ips_linetime);

                bp_gamma = intel_color_get_gamma_bit_precision(pipe_config);
                if (bp_gamma)
                        PIPE_CONF_CHECK_COLOR_LUT(gamma_mode, hw.gamma_lut, bp_gamma);

                PIPE_CONF_CHECK_BOOL(has_psr);
                PIPE_CONF_CHECK_BOOL(has_psr2);
                PIPE_CONF_CHECK_BOOL(enable_psr2_sel_fetch);
                PIPE_CONF_CHECK_I(dc3co_exitline);
        }

        PIPE_CONF_CHECK_BOOL(double_wide);

        if (dev_priv->dpll.mgr)
                PIPE_CONF_CHECK_P(shared_dpll);

        /* FIXME do the readout properly and get rid of this quirk */
        if (dev_priv->dpll.mgr && !PIPE_CONF_QUIRK(PIPE_CONFIG_QUIRK_BIGJOINER_SLAVE)) {
                PIPE_CONF_CHECK_X(dpll_hw_state.dpll);
                PIPE_CONF_CHECK_X(dpll_hw_state.dpll_md);
                PIPE_CONF_CHECK_X(dpll_hw_state.fp0);
                PIPE_CONF_CHECK_X(dpll_hw_state.fp1);
                PIPE_CONF_CHECK_X(dpll_hw_state.wrpll);
                PIPE_CONF_CHECK_X(dpll_hw_state.spll);
                PIPE_CONF_CHECK_X(dpll_hw_state.ctrl1);
                PIPE_CONF_CHECK_X(dpll_hw_state.cfgcr1);
                PIPE_CONF_CHECK_X(dpll_hw_state.cfgcr2);
                PIPE_CONF_CHECK_X(dpll_hw_state.cfgcr0);
                PIPE_CONF_CHECK_X(dpll_hw_state.ebb0);
                PIPE_CONF_CHECK_X(dpll_hw_state.ebb4);
                PIPE_CONF_CHECK_X(dpll_hw_state.pll0);
                PIPE_CONF_CHECK_X(dpll_hw_state.pll1);
                PIPE_CONF_CHECK_X(dpll_hw_state.pll2);
                PIPE_CONF_CHECK_X(dpll_hw_state.pll3);
                PIPE_CONF_CHECK_X(dpll_hw_state.pll6);
                PIPE_CONF_CHECK_X(dpll_hw_state.pll8);
                PIPE_CONF_CHECK_X(dpll_hw_state.pll9);
                PIPE_CONF_CHECK_X(dpll_hw_state.pll10);
                PIPE_CONF_CHECK_X(dpll_hw_state.pcsdw12);
                PIPE_CONF_CHECK_X(dpll_hw_state.mg_refclkin_ctl);
                PIPE_CONF_CHECK_X(dpll_hw_state.mg_clktop2_coreclkctl1);
                PIPE_CONF_CHECK_X(dpll_hw_state.mg_clktop2_hsclkctl);
                PIPE_CONF_CHECK_X(dpll_hw_state.mg_pll_div0);
                PIPE_CONF_CHECK_X(dpll_hw_state.mg_pll_div1);
                PIPE_CONF_CHECK_X(dpll_hw_state.mg_pll_lf);
                PIPE_CONF_CHECK_X(dpll_hw_state.mg_pll_frac_lock);
                PIPE_CONF_CHECK_X(dpll_hw_state.mg_pll_ssc);
                PIPE_CONF_CHECK_X(dpll_hw_state.mg_pll_bias);
                PIPE_CONF_CHECK_X(dpll_hw_state.mg_pll_tdc_coldst_bias);
        }

        if (!PIPE_CONF_QUIRK(PIPE_CONFIG_QUIRK_BIGJOINER_SLAVE)) {
                PIPE_CONF_CHECK_X(dsi_pll.ctrl);
                PIPE_CONF_CHECK_X(dsi_pll.div);

                if (IS_G4X(dev_priv) || DISPLAY_VER(dev_priv) >= 5)
                        PIPE_CONF_CHECK_I(pipe_bpp);

                PIPE_CONF_CHECK_CLOCK_FUZZY(hw.pipe_mode.crtc_clock);
                PIPE_CONF_CHECK_CLOCK_FUZZY(hw.adjusted_mode.crtc_clock);
                PIPE_CONF_CHECK_CLOCK_FUZZY(port_clock);

                PIPE_CONF_CHECK_I(min_voltage_level);
        }

        if (fastset && (current_config->has_psr || pipe_config->has_psr))
                PIPE_CONF_CHECK_X_WITH_MASK(infoframes.enable,
                                            ~intel_hdmi_infoframe_enable(DP_SDP_VSC));
        else
                PIPE_CONF_CHECK_X(infoframes.enable);

        PIPE_CONF_CHECK_X(infoframes.gcp);
        PIPE_CONF_CHECK_INFOFRAME(avi);
        PIPE_CONF_CHECK_INFOFRAME(spd);
        PIPE_CONF_CHECK_INFOFRAME(hdmi);
        PIPE_CONF_CHECK_INFOFRAME(drm);
        PIPE_CONF_CHECK_DP_VSC_SDP(vsc);

        PIPE_CONF_CHECK_X(sync_mode_slaves_mask);
        PIPE_CONF_CHECK_I(master_transcoder);
        PIPE_CONF_CHECK_BOOL(bigjoiner);
        PIPE_CONF_CHECK_BOOL(bigjoiner_slave);
        PIPE_CONF_CHECK_P(bigjoiner_linked_crtc);

        PIPE_CONF_CHECK_I(dsc.compression_enable);
        PIPE_CONF_CHECK_I(dsc.dsc_split);
        PIPE_CONF_CHECK_I(dsc.compressed_bpp);

        PIPE_CONF_CHECK_BOOL(splitter.enable);
        PIPE_CONF_CHECK_I(splitter.link_count);
        PIPE_CONF_CHECK_I(splitter.pixel_overlap);

        PIPE_CONF_CHECK_I(mst_master_transcoder);

        PIPE_CONF_CHECK_BOOL(vrr.enable);
        PIPE_CONF_CHECK_I(vrr.vmin);
        PIPE_CONF_CHECK_I(vrr.vmax);
        PIPE_CONF_CHECK_I(vrr.flipline);
        PIPE_CONF_CHECK_I(vrr.pipeline_full);
        PIPE_CONF_CHECK_I(vrr.guardband);

#undef PIPE_CONF_CHECK_X
#undef PIPE_CONF_CHECK_I
#undef PIPE_CONF_CHECK_BOOL
#undef PIPE_CONF_CHECK_BOOL_INCOMPLETE
#undef PIPE_CONF_CHECK_P
#undef PIPE_CONF_CHECK_FLAGS
#undef PIPE_CONF_CHECK_CLOCK_FUZZY
#undef PIPE_CONF_CHECK_COLOR_LUT
#undef PIPE_CONF_QUIRK

        return ret;
}

static void intel_pipe_config_sanity_check(struct drm_i915_private *dev_priv,
                                           const struct intel_crtc_state *pipe_config)
{
        if (pipe_config->has_pch_encoder) {
                int fdi_dotclock = intel_dotclock_calculate(intel_fdi_link_freq(dev_priv, pipe_config),
                                                            &pipe_config->fdi_m_n);
                int dotclock = pipe_config->hw.adjusted_mode.crtc_clock;

                /*
                 * FDI already provided one idea for the dotclock.
                 * Yell if the encoder disagrees.
                 */
                drm_WARN(&dev_priv->drm,
                         !intel_fuzzy_clock_check(fdi_dotclock, dotclock),
                         "FDI dotclock and encoder dotclock mismatch, fdi: %i, encoder: %i\n",
                         fdi_dotclock, dotclock);
        }
}

static void verify_wm_state(struct intel_crtc *crtc,
                            struct intel_crtc_state *new_crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct skl_hw_state {
                struct skl_ddb_entry ddb_y[I915_MAX_PLANES];
                struct skl_ddb_entry ddb_uv[I915_MAX_PLANES];
                struct skl_pipe_wm wm;
        } *hw;
        const struct skl_pipe_wm *sw_wm = &new_crtc_state->wm.skl.optimal;
        int level, max_level = ilk_wm_max_level(dev_priv);
        struct intel_plane *plane;
        u8 hw_enabled_slices;

        if (DISPLAY_VER(dev_priv) < 9 || !new_crtc_state->hw.active)
                return;

        hw = kzalloc(sizeof(*hw), GFP_KERNEL);
        if (!hw)
                return;

        skl_pipe_wm_get_hw_state(crtc, &hw->wm);

        skl_pipe_ddb_get_hw_state(crtc, hw->ddb_y, hw->ddb_uv);

        hw_enabled_slices = intel_enabled_dbuf_slices_mask(dev_priv);

        if (DISPLAY_VER(dev_priv) >= 11 &&
            hw_enabled_slices != dev_priv->dbuf.enabled_slices)
                drm_err(&dev_priv->drm,
                        "mismatch in DBUF Slices (expected 0x%x, got 0x%x)\n",
                        dev_priv->dbuf.enabled_slices,
                        hw_enabled_slices);

        for_each_intel_plane_on_crtc(&dev_priv->drm, crtc, plane) {
                const struct skl_ddb_entry *hw_ddb_entry, *sw_ddb_entry;
                const struct skl_wm_level *hw_wm_level, *sw_wm_level;

                /* Watermarks */
                for (level = 0; level <= max_level; level++) {
                        hw_wm_level = &hw->wm.planes[plane->id].wm[level];
                        sw_wm_level = skl_plane_wm_level(sw_wm, plane->id, level);

                        if (skl_wm_level_equals(hw_wm_level, sw_wm_level))
                                continue;

                        drm_err(&dev_priv->drm,
                                "[PLANE:%d:%s] mismatch in WM%d (expected e=%d b=%u l=%u, got e=%d b=%u l=%u)\n",
                                plane->base.base.id, plane->base.name, level,
                                sw_wm_level->enable,
                                sw_wm_level->blocks,
                                sw_wm_level->lines,
                                hw_wm_level->enable,
                                hw_wm_level->blocks,
                                hw_wm_level->lines);
                }

                hw_wm_level = &hw->wm.planes[plane->id].trans_wm;
                sw_wm_level = skl_plane_trans_wm(sw_wm, plane->id);

                if (!skl_wm_level_equals(hw_wm_level, sw_wm_level)) {
                        drm_err(&dev_priv->drm,
                                "[PLANE:%d:%s] mismatch in trans WM (expected e=%d b=%u l=%u, got e=%d b=%u l=%u)\n",
                                plane->base.base.id, plane->base.name,
                                sw_wm_level->enable,
                                sw_wm_level->blocks,
                                sw_wm_level->lines,
                                hw_wm_level->enable,
                                hw_wm_level->blocks,
                                hw_wm_level->lines);
                }

                hw_wm_level = &hw->wm.planes[plane->id].sagv.wm0;
                sw_wm_level = &sw_wm->planes[plane->id].sagv.wm0;

                if (HAS_HW_SAGV_WM(dev_priv) &&
                    !skl_wm_level_equals(hw_wm_level, sw_wm_level)) {
                        drm_err(&dev_priv->drm,
                                "[PLANE:%d:%s] mismatch in SAGV WM (expected e=%d b=%u l=%u, got e=%d b=%u l=%u)\n",
                                plane->base.base.id, plane->base.name,
                                sw_wm_level->enable,
                                sw_wm_level->blocks,
                                sw_wm_level->lines,
                                hw_wm_level->enable,
                                hw_wm_level->blocks,
                                hw_wm_level->lines);
                }

                hw_wm_level = &hw->wm.planes[plane->id].sagv.trans_wm;
                sw_wm_level = &sw_wm->planes[plane->id].sagv.trans_wm;

                if (HAS_HW_SAGV_WM(dev_priv) &&
                    !skl_wm_level_equals(hw_wm_level, sw_wm_level)) {
                        drm_err(&dev_priv->drm,
                                "[PLANE:%d:%s] mismatch in SAGV trans WM (expected e=%d b=%u l=%u, got e=%d b=%u l=%u)\n",
                                plane->base.base.id, plane->base.name,
                                sw_wm_level->enable,
                                sw_wm_level->blocks,
                                sw_wm_level->lines,
                                hw_wm_level->enable,
                                hw_wm_level->blocks,
                                hw_wm_level->lines);
                }

                /* DDB */
                hw_ddb_entry = &hw->ddb_y[plane->id];
                sw_ddb_entry = &new_crtc_state->wm.skl.plane_ddb_y[plane->id];

                if (!skl_ddb_entry_equal(hw_ddb_entry, sw_ddb_entry)) {
                        drm_err(&dev_priv->drm,
                                "[PLANE:%d:%s] mismatch in DDB (expected (%u,%u), found (%u,%u))\n",
                                plane->base.base.id, plane->base.name,
                                sw_ddb_entry->start, sw_ddb_entry->end,
                                hw_ddb_entry->start, hw_ddb_entry->end);
                }
        }

        kfree(hw);
}

static void
verify_connector_state(struct intel_atomic_state *state,
                       struct intel_crtc *crtc)
{
        struct drm_connector *connector;
        struct drm_connector_state *new_conn_state;
        int i;

        for_each_new_connector_in_state(&state->base, connector, new_conn_state, i) {
                struct drm_encoder *encoder = connector->encoder;
                struct intel_crtc_state *crtc_state = NULL;

                if (new_conn_state->crtc != &crtc->base)
                        continue;

                if (crtc)
                        crtc_state = intel_atomic_get_new_crtc_state(state, crtc);

                intel_connector_verify_state(crtc_state, new_conn_state);

                I915_STATE_WARN(new_conn_state->best_encoder != encoder,
                     "connector's atomic encoder doesn't match legacy encoder\n");
        }
}

static void
verify_encoder_state(struct drm_i915_private *dev_priv, struct intel_atomic_state *state)
{
        struct intel_encoder *encoder;
        struct drm_connector *connector;
        struct drm_connector_state *old_conn_state, *new_conn_state;
        int i;

        for_each_intel_encoder(&dev_priv->drm, encoder) {
                bool enabled = false, found = false;
                enum pipe pipe;

                drm_dbg_kms(&dev_priv->drm, "[ENCODER:%d:%s]\n",
                            encoder->base.base.id,
                            encoder->base.name);

                for_each_oldnew_connector_in_state(&state->base, connector, old_conn_state,
                                                   new_conn_state, i) {
                        if (old_conn_state->best_encoder == &encoder->base)
                                found = true;

                        if (new_conn_state->best_encoder != &encoder->base)
                                continue;
                        found = enabled = true;

                        I915_STATE_WARN(new_conn_state->crtc !=
                                        encoder->base.crtc,
                             "connector's crtc doesn't match encoder crtc\n");
                }

                if (!found)
                        continue;

                I915_STATE_WARN(!!encoder->base.crtc != enabled,
                     "encoder's enabled state mismatch "
                     "(expected %i, found %i)\n",
                     !!encoder->base.crtc, enabled);

                if (!encoder->base.crtc) {
                        bool active;

                        active = encoder->get_hw_state(encoder, &pipe);
                        I915_STATE_WARN(active,
                             "encoder detached but still enabled on pipe %c.\n",
                             pipe_name(pipe));
                }
        }
}

static void
verify_crtc_state(struct intel_crtc *crtc,
                  struct intel_crtc_state *old_crtc_state,
                  struct intel_crtc_state *new_crtc_state)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_encoder *encoder;
        struct intel_crtc_state *pipe_config = old_crtc_state;
        struct drm_atomic_state *state = old_crtc_state->uapi.state;
        struct intel_crtc *master = crtc;

        __drm_atomic_helper_crtc_destroy_state(&old_crtc_state->uapi);
        intel_crtc_free_hw_state(old_crtc_state);
        intel_crtc_state_reset(old_crtc_state, crtc);
        old_crtc_state->uapi.state = state;

        drm_dbg_kms(&dev_priv->drm, "[CRTC:%d:%s]\n", crtc->base.base.id,
                    crtc->base.name);

        pipe_config->hw.enable = new_crtc_state->hw.enable;

        intel_crtc_get_pipe_config(pipe_config);

        /* we keep both pipes enabled on 830 */
        if (IS_I830(dev_priv) && pipe_config->hw.active)
                pipe_config->hw.active = new_crtc_state->hw.active;

        I915_STATE_WARN(new_crtc_state->hw.active != pipe_config->hw.active,
                        "crtc active state doesn't match with hw state "
                        "(expected %i, found %i)\n",
                        new_crtc_state->hw.active, pipe_config->hw.active);

        I915_STATE_WARN(crtc->active != new_crtc_state->hw.active,
                        "transitional active state does not match atomic hw state "
                        "(expected %i, found %i)\n",
                        new_crtc_state->hw.active, crtc->active);

        if (new_crtc_state->bigjoiner_slave)
                master = new_crtc_state->bigjoiner_linked_crtc;

        for_each_encoder_on_crtc(dev, &master->base, encoder) {
                enum pipe pipe;
                bool active;

                active = encoder->get_hw_state(encoder, &pipe);
                I915_STATE_WARN(active != new_crtc_state->hw.active,
                                "[ENCODER:%i] active %i with crtc active %i\n",
                                encoder->base.base.id, active,
                                new_crtc_state->hw.active);

                I915_STATE_WARN(active && master->pipe != pipe,
                                "Encoder connected to wrong pipe %c\n",
                                pipe_name(pipe));

                if (active)
                        intel_encoder_get_config(encoder, pipe_config);
        }

        if (!new_crtc_state->hw.active)
                return;

        if (new_crtc_state->bigjoiner_slave)
                /* No PLLs set for slave */
                pipe_config->shared_dpll = NULL;

        intel_pipe_config_sanity_check(dev_priv, pipe_config);

        if (!intel_pipe_config_compare(new_crtc_state,
                                       pipe_config, false)) {
                I915_STATE_WARN(1, "pipe state doesn't match!\n");
                intel_dump_pipe_config(pipe_config, NULL, "[hw state]");
                intel_dump_pipe_config(new_crtc_state, NULL, "[sw state]");
        }
}

static void
intel_verify_planes(struct intel_atomic_state *state)
{
        struct intel_plane *plane;
        const struct intel_plane_state *plane_state;
        int i;

        for_each_new_intel_plane_in_state(state, plane,
                                          plane_state, i)
                assert_plane(plane, plane_state->planar_slave ||
                             plane_state->uapi.visible);
}

static void
verify_single_dpll_state(struct drm_i915_private *dev_priv,
                         struct intel_shared_dpll *pll,
                         struct intel_crtc *crtc,
                         struct intel_crtc_state *new_crtc_state)
{
        struct intel_dpll_hw_state dpll_hw_state;
        u8 pipe_mask;
        bool active;

        memset(&dpll_hw_state, 0, sizeof(dpll_hw_state));

        drm_dbg_kms(&dev_priv->drm, "%s\n", pll->info->name);

        active = intel_dpll_get_hw_state(dev_priv, pll, &dpll_hw_state);

        if (!(pll->info->flags & INTEL_DPLL_ALWAYS_ON)) {
                I915_STATE_WARN(!pll->on && pll->active_mask,
                     "pll in active use but not on in sw tracking\n");
                I915_STATE_WARN(pll->on && !pll->active_mask,
                     "pll is on but not used by any active pipe\n");
                I915_STATE_WARN(pll->on != active,
                     "pll on state mismatch (expected %i, found %i)\n",
                     pll->on, active);
        }

        if (!crtc) {
                I915_STATE_WARN(pll->active_mask & ~pll->state.pipe_mask,
                                "more active pll users than references: 0x%x vs 0x%x\n",
                                pll->active_mask, pll->state.pipe_mask);

                return;
        }

        pipe_mask = BIT(crtc->pipe);

        if (new_crtc_state->hw.active)
                I915_STATE_WARN(!(pll->active_mask & pipe_mask),
                                "pll active mismatch (expected pipe %c in active mask 0x%x)\n",
                                pipe_name(crtc->pipe), pll->active_mask);
        else
                I915_STATE_WARN(pll->active_mask & pipe_mask,
                                "pll active mismatch (didn't expect pipe %c in active mask 0x%x)\n",
                                pipe_name(crtc->pipe), pll->active_mask);

        I915_STATE_WARN(!(pll->state.pipe_mask & pipe_mask),
                        "pll enabled crtcs mismatch (expected 0x%x in 0x%x)\n",
                        pipe_mask, pll->state.pipe_mask);

        I915_STATE_WARN(pll->on && memcmp(&pll->state.hw_state,
                                          &dpll_hw_state,
                                          sizeof(dpll_hw_state)),
                        "pll hw state mismatch\n");
}

static void
verify_shared_dpll_state(struct intel_crtc *crtc,
                         struct intel_crtc_state *old_crtc_state,
                         struct intel_crtc_state *new_crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        if (new_crtc_state->shared_dpll)
                verify_single_dpll_state(dev_priv, new_crtc_state->shared_dpll, crtc, new_crtc_state);

        if (old_crtc_state->shared_dpll &&
            old_crtc_state->shared_dpll != new_crtc_state->shared_dpll) {
                u8 pipe_mask = BIT(crtc->pipe);
                struct intel_shared_dpll *pll = old_crtc_state->shared_dpll;

                I915_STATE_WARN(pll->active_mask & pipe_mask,
                                "pll active mismatch (didn't expect pipe %c in active mask (0x%x))\n",
                                pipe_name(crtc->pipe), pll->active_mask);
                I915_STATE_WARN(pll->state.pipe_mask & pipe_mask,
                                "pll enabled crtcs mismatch (found %x in enabled mask (0x%x))\n",
                                pipe_name(crtc->pipe), pll->state.pipe_mask);
        }
}

static void
verify_mpllb_state(struct intel_atomic_state *state,
                   struct intel_crtc_state *new_crtc_state)
{
        struct drm_i915_private *i915 = to_i915(state->base.dev);
        struct intel_mpllb_state mpllb_hw_state = { 0 };
        struct intel_mpllb_state *mpllb_sw_state = &new_crtc_state->mpllb_state;
        struct intel_crtc *crtc = to_intel_crtc(new_crtc_state->uapi.crtc);
        struct intel_encoder *encoder;

        if (!IS_DG2(i915))
                return;

        if (!new_crtc_state->hw.active)
                return;

        if (new_crtc_state->bigjoiner_slave)
                return;

        encoder = intel_get_crtc_new_encoder(state, new_crtc_state);
        intel_mpllb_readout_hw_state(encoder, &mpllb_hw_state);

#define MPLLB_CHECK(name) do { \
        if (mpllb_sw_state->name != mpllb_hw_state.name) { \
                pipe_config_mismatch(false, crtc, "MPLLB:" __stringify(name), \
                                     "(expected 0x%08x, found 0x%08x)", \
                                     mpllb_sw_state->name, \
                                     mpllb_hw_state.name); \
        } \
} while (0)

        MPLLB_CHECK(mpllb_cp);
        MPLLB_CHECK(mpllb_div);
        MPLLB_CHECK(mpllb_div2);
        MPLLB_CHECK(mpllb_fracn1);
        MPLLB_CHECK(mpllb_fracn2);
        MPLLB_CHECK(mpllb_sscen);
        MPLLB_CHECK(mpllb_sscstep);

        /*
         * ref_control is handled by the hardware/firemware and never
         * programmed by the software, but the proper values are supplied
         * in the bspec for verification purposes.
         */
        MPLLB_CHECK(ref_control);

#undef MPLLB_CHECK
}

static void
intel_modeset_verify_crtc(struct intel_crtc *crtc,
                          struct intel_atomic_state *state,
                          struct intel_crtc_state *old_crtc_state,
                          struct intel_crtc_state *new_crtc_state)
{
        if (!intel_crtc_needs_modeset(new_crtc_state) && !new_crtc_state->update_pipe)
                return;

        verify_wm_state(crtc, new_crtc_state);
        verify_connector_state(state, crtc);
        verify_crtc_state(crtc, old_crtc_state, new_crtc_state);
        verify_shared_dpll_state(crtc, old_crtc_state, new_crtc_state);
        verify_mpllb_state(state, new_crtc_state);
}

static void
verify_disabled_dpll_state(struct drm_i915_private *dev_priv)
{
        int i;

        for (i = 0; i < dev_priv->dpll.num_shared_dpll; i++)
                verify_single_dpll_state(dev_priv,
                                         &dev_priv->dpll.shared_dplls[i],
                                         NULL, NULL);
}

static void
intel_modeset_verify_disabled(struct drm_i915_private *dev_priv,
                              struct intel_atomic_state *state)
{
        verify_encoder_state(dev_priv, state);
        verify_connector_state(state, NULL);
        verify_disabled_dpll_state(dev_priv);
}

int intel_modeset_all_pipes(struct intel_atomic_state *state)
{
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);
        struct intel_crtc *crtc;

        /*
         * Add all pipes to the state, and force
         * a modeset on all the active ones.
         */
        for_each_intel_crtc(&dev_priv->drm, crtc) {
                struct intel_crtc_state *crtc_state;
                int ret;

                crtc_state = intel_atomic_get_crtc_state(&state->base, crtc);
                if (IS_ERR(crtc_state))
                        return PTR_ERR(crtc_state);

                if (!crtc_state->hw.active ||
                    drm_atomic_crtc_needs_modeset(&crtc_state->uapi))
                        continue;

                crtc_state->uapi.mode_changed = true;

                ret = drm_atomic_add_affected_connectors(&state->base,
                                                         &crtc->base);
                if (ret)
                        return ret;

                ret = intel_atomic_add_affected_planes(state, crtc);
                if (ret)
                        return ret;

                crtc_state->update_planes |= crtc_state->active_planes;
        }

        return 0;
}

static void
intel_crtc_update_active_timings(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        struct drm_display_mode adjusted_mode =
                crtc_state->hw.adjusted_mode;

        if (crtc_state->vrr.enable) {
                adjusted_mode.crtc_vtotal = crtc_state->vrr.vmax;
                adjusted_mode.crtc_vblank_end = crtc_state->vrr.vmax;
                adjusted_mode.crtc_vblank_start = intel_vrr_vmin_vblank_start(crtc_state);
                crtc->vmax_vblank_start = intel_vrr_vmax_vblank_start(crtc_state);
        }

        drm_calc_timestamping_constants(&crtc->base, &adjusted_mode);

        crtc->mode_flags = crtc_state->mode_flags;

        /*
         * The scanline counter increments at the leading edge of hsync.
         *
         * On most platforms it starts counting from vtotal-1 on the
         * first active line. That means the scanline counter value is
         * always one less than what we would expect. Ie. just after
         * start of vblank, which also occurs at start of hsync (on the
         * last active line), the scanline counter will read vblank_start-1.
         *
         * On gen2 the scanline counter starts counting from 1 instead
         * of vtotal-1, so we have to subtract one (or rather add vtotal-1
         * to keep the value positive), instead of adding one.
         *
         * On HSW+ the behaviour of the scanline counter depends on the output
         * type. For DP ports it behaves like most other platforms, but on HDMI
         * there's an extra 1 line difference. So we need to add two instead of
         * one to the value.
         *
         * On VLV/CHV DSI the scanline counter would appear to increment
         * approx. 1/3 of a scanline before start of vblank. Unfortunately
         * that means we can't tell whether we're in vblank or not while
         * we're on that particular line. We must still set scanline_offset
         * to 1 so that the vblank timestamps come out correct when we query
         * the scanline counter from within the vblank interrupt handler.
         * However if queried just before the start of vblank we'll get an
         * answer that's slightly in the future.
         */
        if (DISPLAY_VER(dev_priv) == 2) {
                int vtotal;

                vtotal = adjusted_mode.crtc_vtotal;
                if (adjusted_mode.flags & DRM_MODE_FLAG_INTERLACE)
                        vtotal /= 2;

                crtc->scanline_offset = vtotal - 1;
        } else if (HAS_DDI(dev_priv) &&
                   intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI)) {
                crtc->scanline_offset = 2;
        } else {
                crtc->scanline_offset = 1;
        }
}

static void intel_modeset_clear_plls(struct intel_atomic_state *state)
{
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);
        struct intel_crtc_state *new_crtc_state;
        struct intel_crtc *crtc;
        int i;

        if (!dev_priv->display.crtc_compute_clock)
                return;

        for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
                if (!intel_crtc_needs_modeset(new_crtc_state))
                        continue;

                intel_release_shared_dplls(state, crtc);
        }
}

/*
 * This implements the workaround described in the "notes" section of the mode
 * set sequence documentation. When going from no pipes or single pipe to
 * multiple pipes, and planes are enabled after the pipe, we need to wait at
 * least 2 vblanks on the first pipe before enabling planes on the second pipe.
 */
static int hsw_mode_set_planes_workaround(struct intel_atomic_state *state)
{
        struct intel_crtc_state *crtc_state;
        struct intel_crtc *crtc;
        struct intel_crtc_state *first_crtc_state = NULL;
        struct intel_crtc_state *other_crtc_state = NULL;
        enum pipe first_pipe = INVALID_PIPE, enabled_pipe = INVALID_PIPE;
        int i;

        /* look at all crtc's that are going to be enabled in during modeset */
        for_each_new_intel_crtc_in_state(state, crtc, crtc_state, i) {
                if (!crtc_state->hw.active ||
                    !intel_crtc_needs_modeset(crtc_state))
                        continue;

                if (first_crtc_state) {
                        other_crtc_state = crtc_state;
                        break;
                } else {
                        first_crtc_state = crtc_state;
                        first_pipe = crtc->pipe;
                }
        }

        /* No workaround needed? */
        if (!first_crtc_state)
                return 0;

        /* w/a possibly needed, check how many crtc's are already enabled. */
        for_each_intel_crtc(state->base.dev, crtc) {
                crtc_state = intel_atomic_get_crtc_state(&state->base, crtc);
                if (IS_ERR(crtc_state))
                        return PTR_ERR(crtc_state);

                crtc_state->hsw_workaround_pipe = INVALID_PIPE;

                if (!crtc_state->hw.active ||
                    intel_crtc_needs_modeset(crtc_state))
                        continue;

                /* 2 or more enabled crtcs means no need for w/a */
                if (enabled_pipe != INVALID_PIPE)
                        return 0;

                enabled_pipe = crtc->pipe;
        }

        if (enabled_pipe != INVALID_PIPE)
                first_crtc_state->hsw_workaround_pipe = enabled_pipe;
        else if (other_crtc_state)
                other_crtc_state->hsw_workaround_pipe = first_pipe;

        return 0;
}

u8 intel_calc_active_pipes(struct intel_atomic_state *state,
                           u8 active_pipes)
{
        const struct intel_crtc_state *crtc_state;
        struct intel_crtc *crtc;
        int i;

        for_each_new_intel_crtc_in_state(state, crtc, crtc_state, i) {
                if (crtc_state->hw.active)
                        active_pipes |= BIT(crtc->pipe);
                else
                        active_pipes &= ~BIT(crtc->pipe);
        }

        return active_pipes;
}

static int intel_modeset_checks(struct intel_atomic_state *state)
{
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);

        state->modeset = true;

        if (IS_HASWELL(dev_priv))
                return hsw_mode_set_planes_workaround(state);

        return 0;
}

/*
 * Handle calculation of various watermark data at the end of the atomic check
 * phase.  The code here should be run after the per-crtc and per-plane 'check'
 * handlers to ensure that all derived state has been updated.
 */
static int calc_watermark_data(struct intel_atomic_state *state)
{
        struct drm_device *dev = state->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);

        /* Is there platform-specific watermark information to calculate? */
        if (dev_priv->display.compute_global_watermarks)
                return dev_priv->display.compute_global_watermarks(state);

        return 0;
}

static void intel_crtc_check_fastset(const struct intel_crtc_state *old_crtc_state,
                                     struct intel_crtc_state *new_crtc_state)
{
        if (!intel_pipe_config_compare(old_crtc_state, new_crtc_state, true))
                return;

        new_crtc_state->uapi.mode_changed = false;
        new_crtc_state->update_pipe = true;
}

static void intel_crtc_copy_fastset(const struct intel_crtc_state *old_crtc_state,
                                    struct intel_crtc_state *new_crtc_state)
{
        /*
         * If we're not doing the full modeset we want to
         * keep the current M/N values as they may be
         * sufficiently different to the computed values
         * to cause problems.
         *
         * FIXME: should really copy more fuzzy state here
         */
        new_crtc_state->fdi_m_n = old_crtc_state->fdi_m_n;
        new_crtc_state->dp_m_n = old_crtc_state->dp_m_n;
        new_crtc_state->dp_m2_n2 = old_crtc_state->dp_m2_n2;
        new_crtc_state->has_drrs = old_crtc_state->has_drrs;
}

static int intel_crtc_add_planes_to_state(struct intel_atomic_state *state,
                                          struct intel_crtc *crtc,
                                          u8 plane_ids_mask)
{
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);
        struct intel_plane *plane;

        for_each_intel_plane_on_crtc(&dev_priv->drm, crtc, plane) {
                struct intel_plane_state *plane_state;

                if ((plane_ids_mask & BIT(plane->id)) == 0)
                        continue;

                plane_state = intel_atomic_get_plane_state(state, plane);
                if (IS_ERR(plane_state))
                        return PTR_ERR(plane_state);
        }

        return 0;
}

int intel_atomic_add_affected_planes(struct intel_atomic_state *state,
                                     struct intel_crtc *crtc)
{
        const struct intel_crtc_state *old_crtc_state =
                intel_atomic_get_old_crtc_state(state, crtc);
        const struct intel_crtc_state *new_crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);

        return intel_crtc_add_planes_to_state(state, crtc,
                                              old_crtc_state->enabled_planes |
                                              new_crtc_state->enabled_planes);
}

static bool active_planes_affects_min_cdclk(struct drm_i915_private *dev_priv)
{
        /* See {hsw,vlv,ivb}_plane_ratio() */
        return IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv) ||
                IS_CHERRYVIEW(dev_priv) || IS_VALLEYVIEW(dev_priv) ||
                IS_IVYBRIDGE(dev_priv);
}

static int intel_crtc_add_bigjoiner_planes(struct intel_atomic_state *state,
                                           struct intel_crtc *crtc,
                                           struct intel_crtc *other)
{
        const struct intel_plane_state *plane_state;
        struct intel_plane *plane;
        u8 plane_ids = 0;
        int i;

        for_each_new_intel_plane_in_state(state, plane, plane_state, i) {
                if (plane->pipe == crtc->pipe)
                        plane_ids |= BIT(plane->id);
        }

        return intel_crtc_add_planes_to_state(state, other, plane_ids);
}

static int intel_bigjoiner_add_affected_planes(struct intel_atomic_state *state)
{
        const struct intel_crtc_state *crtc_state;
        struct intel_crtc *crtc;
        int i;

        for_each_new_intel_crtc_in_state(state, crtc, crtc_state, i) {
                int ret;

                if (!crtc_state->bigjoiner)
                        continue;

                ret = intel_crtc_add_bigjoiner_planes(state, crtc,
                                                      crtc_state->bigjoiner_linked_crtc);
                if (ret)
                        return ret;
        }

        return 0;
}

static int intel_atomic_check_planes(struct intel_atomic_state *state)
{
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);
        struct intel_crtc_state *old_crtc_state, *new_crtc_state;
        struct intel_plane_state *plane_state;
        struct intel_plane *plane;
        struct intel_crtc *crtc;
        int i, ret;

        ret = icl_add_linked_planes(state);
        if (ret)
                return ret;

        ret = intel_bigjoiner_add_affected_planes(state);
        if (ret)
                return ret;

        for_each_new_intel_plane_in_state(state, plane, plane_state, i) {
                ret = intel_plane_atomic_check(state, plane);
                if (ret) {
                        drm_dbg_atomic(&dev_priv->drm,
                                       "[PLANE:%d:%s] atomic driver check failed\n",
                                       plane->base.base.id, plane->base.name);
                        return ret;
                }
        }

        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                            new_crtc_state, i) {
                u8 old_active_planes, new_active_planes;

                ret = icl_check_nv12_planes(new_crtc_state);
                if (ret)
                        return ret;

                /*
                 * On some platforms the number of active planes affects
                 * the planes' minimum cdclk calculation. Add such planes
                 * to the state before we compute the minimum cdclk.
                 */
                if (!active_planes_affects_min_cdclk(dev_priv))
                        continue;

                old_active_planes = old_crtc_state->active_planes & ~BIT(PLANE_CURSOR);
                new_active_planes = new_crtc_state->active_planes & ~BIT(PLANE_CURSOR);

                if (hweight8(old_active_planes) == hweight8(new_active_planes))
                        continue;

                ret = intel_crtc_add_planes_to_state(state, crtc, new_active_planes);
                if (ret)
                        return ret;
        }

        return 0;
}

static int intel_atomic_check_cdclk(struct intel_atomic_state *state,
                                    bool *need_cdclk_calc)
{
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);
        const struct intel_cdclk_state *old_cdclk_state;
        const struct intel_cdclk_state *new_cdclk_state;
        struct intel_plane_state *plane_state;
        struct intel_bw_state *new_bw_state;
        struct intel_plane *plane;
        int min_cdclk = 0;
        enum pipe pipe;
        int ret;
        int i;
        /*
         * active_planes bitmask has been updated, and potentially
         * affected planes are part of the state. We can now
         * compute the minimum cdclk for each plane.
         */
        for_each_new_intel_plane_in_state(state, plane, plane_state, i) {
                ret = intel_plane_calc_min_cdclk(state, plane, need_cdclk_calc);
                if (ret)
                        return ret;
        }

        old_cdclk_state = intel_atomic_get_old_cdclk_state(state);
        new_cdclk_state = intel_atomic_get_new_cdclk_state(state);

        if (new_cdclk_state &&
            old_cdclk_state->force_min_cdclk != new_cdclk_state->force_min_cdclk)
                *need_cdclk_calc = true;

        ret = dev_priv->display.bw_calc_min_cdclk(state);
        if (ret)
                return ret;

        new_bw_state = intel_atomic_get_new_bw_state(state);

        if (!new_cdclk_state || !new_bw_state)
                return 0;

        for_each_pipe(dev_priv, pipe) {
                min_cdclk = max(new_cdclk_state->min_cdclk[pipe], min_cdclk);

                /*
                 * Currently do this change only if we need to increase
                 */
                if (new_bw_state->min_cdclk > min_cdclk)
                        *need_cdclk_calc = true;
        }

        return 0;
}

static int intel_atomic_check_crtcs(struct intel_atomic_state *state)
{
        struct intel_crtc_state *crtc_state;
        struct intel_crtc *crtc;
        int i;

        for_each_new_intel_crtc_in_state(state, crtc, crtc_state, i) {
                struct drm_i915_private *i915 = to_i915(crtc->base.dev);
                int ret;

                ret = intel_crtc_atomic_check(state, crtc);
                if (ret) {
                        drm_dbg_atomic(&i915->drm,
                                       "[CRTC:%d:%s] atomic driver check failed\n",
                                       crtc->base.base.id, crtc->base.name);
                        return ret;
                }
        }

        return 0;
}

static bool intel_cpu_transcoders_need_modeset(struct intel_atomic_state *state,
                                               u8 transcoders)
{
        const struct intel_crtc_state *new_crtc_state;
        struct intel_crtc *crtc;
        int i;

        for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
                if (new_crtc_state->hw.enable &&
                    transcoders & BIT(new_crtc_state->cpu_transcoder) &&
                    intel_crtc_needs_modeset(new_crtc_state))
                        return true;
        }

        return false;
}

static int intel_atomic_check_bigjoiner(struct intel_atomic_state *state,
                                        struct intel_crtc *crtc,
                                        struct intel_crtc_state *old_crtc_state,
                                        struct intel_crtc_state *new_crtc_state)
{
        struct intel_crtc_state *slave_crtc_state, *master_crtc_state;
        struct intel_crtc *slave, *master;

        /* slave being enabled, is master is still claiming this crtc? */
        if (old_crtc_state->bigjoiner_slave) {
                slave = crtc;
                master = old_crtc_state->bigjoiner_linked_crtc;
                master_crtc_state = intel_atomic_get_new_crtc_state(state, master);
                if (!master_crtc_state || !intel_crtc_needs_modeset(master_crtc_state))
                        goto claimed;
        }

        if (!new_crtc_state->bigjoiner)
                return 0;

        slave = intel_dsc_get_bigjoiner_secondary(crtc);
        if (!slave) {
                DRM_DEBUG_KMS("[CRTC:%d:%s] Big joiner configuration requires "
                              "CRTC + 1 to be used, doesn't exist\n",
                              crtc->base.base.id, crtc->base.name);
                return -EINVAL;
        }

        new_crtc_state->bigjoiner_linked_crtc = slave;
        slave_crtc_state = intel_atomic_get_crtc_state(&state->base, slave);
        master = crtc;
        if (IS_ERR(slave_crtc_state))
                return PTR_ERR(slave_crtc_state);

        /* master being enabled, slave was already configured? */
        if (slave_crtc_state->uapi.enable)
                goto claimed;

        DRM_DEBUG_KMS("[CRTC:%d:%s] Used as slave for big joiner\n",
                      slave->base.base.id, slave->base.name);

        return copy_bigjoiner_crtc_state(slave_crtc_state, new_crtc_state);

claimed:
        DRM_DEBUG_KMS("[CRTC:%d:%s] Slave is enabled as normal CRTC, but "
                      "[CRTC:%d:%s] claiming this CRTC for bigjoiner.\n",
                      slave->base.base.id, slave->base.name,
                      master->base.base.id, master->base.name);
        return -EINVAL;
}

static void kill_bigjoiner_slave(struct intel_atomic_state *state,
                                 struct intel_crtc_state *master_crtc_state)
{
        struct intel_crtc_state *slave_crtc_state =
                intel_atomic_get_new_crtc_state(state, master_crtc_state->bigjoiner_linked_crtc);

        slave_crtc_state->bigjoiner = master_crtc_state->bigjoiner = false;
        slave_crtc_state->bigjoiner_slave = master_crtc_state->bigjoiner_slave = false;
        slave_crtc_state->bigjoiner_linked_crtc = master_crtc_state->bigjoiner_linked_crtc = NULL;
        intel_crtc_copy_uapi_to_hw_state(state, slave_crtc_state);
}

/**
 * DOC: asynchronous flip implementation
 *
 * Asynchronous page flip is the implementation for the DRM_MODE_PAGE_FLIP_ASYNC
 * flag. Currently async flip is only supported via the drmModePageFlip IOCTL.
 * Correspondingly, support is currently added for primary plane only.
 *
 * Async flip can only change the plane surface address, so anything else
 * changing is rejected from the intel_atomic_check_async() function.
 * Once this check is cleared, flip done interrupt is enabled using
 * the intel_crtc_enable_flip_done() function.
 *
 * As soon as the surface address register is written, flip done interrupt is
 * generated and the requested events are sent to the usersapce in the interrupt
 * handler itself. The timestamp and sequence sent during the flip done event
 * correspond to the last vblank and have no relation to the actual time when
 * the flip done event was sent.
 */
static int intel_atomic_check_async(struct intel_atomic_state *state)
{
        struct drm_i915_private *i915 = to_i915(state->base.dev);
        const struct intel_crtc_state *old_crtc_state, *new_crtc_state;
        const struct intel_plane_state *new_plane_state, *old_plane_state;
        struct intel_crtc *crtc;
        struct intel_plane *plane;
        int i;

        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                            new_crtc_state, i) {
                if (intel_crtc_needs_modeset(new_crtc_state)) {
                        drm_dbg_kms(&i915->drm, "Modeset Required. Async flip not supported\n");
                        return -EINVAL;
                }

                if (!new_crtc_state->hw.active) {
                        drm_dbg_kms(&i915->drm, "CRTC inactive\n");
                        return -EINVAL;
                }
                if (old_crtc_state->active_planes != new_crtc_state->active_planes) {
                        drm_dbg_kms(&i915->drm,
                                    "Active planes cannot be changed during async flip\n");
                        return -EINVAL;
                }
        }

        for_each_oldnew_intel_plane_in_state(state, plane, old_plane_state,
                                             new_plane_state, i) {
                /*
                 * TODO: Async flip is only supported through the page flip IOCTL
                 * as of now. So support currently added for primary plane only.
                 * Support for other planes on platforms on which supports
                 * this(vlv/chv and icl+) should be added when async flip is
                 * enabled in the atomic IOCTL path.
                 */
                if (!plane->async_flip)
                        return -EINVAL;

                /*
                 * FIXME: This check is kept generic for all platforms.
                 * Need to verify this for all gen9 platforms to enable
                 * this selectively if required.
                 */
                switch (new_plane_state->hw.fb->modifier) {
                case I915_FORMAT_MOD_X_TILED:
                case I915_FORMAT_MOD_Y_TILED:
                case I915_FORMAT_MOD_Yf_TILED:
                        break;
                default:
                        drm_dbg_kms(&i915->drm,
                                    "Linear memory/CCS does not support async flips\n");
                        return -EINVAL;
                }

                if (old_plane_state->view.color_plane[0].stride !=
                    new_plane_state->view.color_plane[0].stride) {
                        drm_dbg_kms(&i915->drm, "Stride cannot be changed in async flip\n");
                        return -EINVAL;
                }

                if (old_plane_state->hw.fb->modifier !=
                    new_plane_state->hw.fb->modifier) {
                        drm_dbg_kms(&i915->drm,
                                    "Framebuffer modifiers cannot be changed in async flip\n");
                        return -EINVAL;
                }

                if (old_plane_state->hw.fb->format !=
                    new_plane_state->hw.fb->format) {
                        drm_dbg_kms(&i915->drm,
                                    "Framebuffer format cannot be changed in async flip\n");
                        return -EINVAL;
                }

                if (old_plane_state->hw.rotation !=
                    new_plane_state->hw.rotation) {
                        drm_dbg_kms(&i915->drm, "Rotation cannot be changed in async flip\n");
                        return -EINVAL;
                }

                if (!drm_rect_equals(&old_plane_state->uapi.src, &new_plane_state->uapi.src) ||
                    !drm_rect_equals(&old_plane_state->uapi.dst, &new_plane_state->uapi.dst)) {
                        drm_dbg_kms(&i915->drm,
                                    "Plane size/co-ordinates cannot be changed in async flip\n");
                        return -EINVAL;
                }

                if (old_plane_state->hw.alpha != new_plane_state->hw.alpha) {
                        drm_dbg_kms(&i915->drm, "Alpha value cannot be changed in async flip\n");
                        return -EINVAL;
                }

                if (old_plane_state->hw.pixel_blend_mode !=
                    new_plane_state->hw.pixel_blend_mode) {
                        drm_dbg_kms(&i915->drm,
                                    "Pixel blend mode cannot be changed in async flip\n");
                        return -EINVAL;
                }

                if (old_plane_state->hw.color_encoding != new_plane_state->hw.color_encoding) {
                        drm_dbg_kms(&i915->drm,
                                    "Color encoding cannot be changed in async flip\n");
                        return -EINVAL;
                }

                if (old_plane_state->hw.color_range != new_plane_state->hw.color_range) {
                        drm_dbg_kms(&i915->drm, "Color range cannot be changed in async flip\n");
                        return -EINVAL;
                }
        }

        return 0;
}

static int intel_bigjoiner_add_affected_crtcs(struct intel_atomic_state *state)
{
        struct intel_crtc_state *crtc_state;
        struct intel_crtc *crtc;
        int i;

        for_each_new_intel_crtc_in_state(state, crtc, crtc_state, i) {
                struct intel_crtc_state *linked_crtc_state;
                struct intel_crtc *linked_crtc;
                int ret;

                if (!crtc_state->bigjoiner)
                        continue;

                linked_crtc = crtc_state->bigjoiner_linked_crtc;
                linked_crtc_state = intel_atomic_get_crtc_state(&state->base, linked_crtc);
                if (IS_ERR(linked_crtc_state))
                        return PTR_ERR(linked_crtc_state);

                if (!intel_crtc_needs_modeset(crtc_state))
                        continue;

                linked_crtc_state->uapi.mode_changed = true;

                ret = drm_atomic_add_affected_connectors(&state->base,
                                                         &linked_crtc->base);
                if (ret)
                        return ret;

                ret = intel_atomic_add_affected_planes(state, linked_crtc);
                if (ret)
                        return ret;
        }

        for_each_new_intel_crtc_in_state(state, crtc, crtc_state, i) {
                /* Kill old bigjoiner link, we may re-establish afterwards */
                if (intel_crtc_needs_modeset(crtc_state) &&
                    crtc_state->bigjoiner && !crtc_state->bigjoiner_slave)
                        kill_bigjoiner_slave(state, crtc_state);
        }

        return 0;
}

/**
 * intel_atomic_check - validate state object
 * @dev: drm device
 * @_state: state to validate
 */
static int intel_atomic_check(struct drm_device *dev,
                              struct drm_atomic_state *_state)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_atomic_state *state = to_intel_atomic_state(_state);
        struct intel_crtc_state *old_crtc_state, *new_crtc_state;
        struct intel_crtc *crtc;
        int ret, i;
        bool any_ms = false;

        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                            new_crtc_state, i) {
                if (new_crtc_state->inherited != old_crtc_state->inherited)
                        new_crtc_state->uapi.mode_changed = true;
        }

        intel_vrr_check_modeset(state);

        ret = drm_atomic_helper_check_modeset(dev, &state->base);
        if (ret)
                goto fail;

        ret = intel_bigjoiner_add_affected_crtcs(state);
        if (ret)
                goto fail;

        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                            new_crtc_state, i) {
                if (!intel_crtc_needs_modeset(new_crtc_state)) {
                        /* Light copy */
                        intel_crtc_copy_uapi_to_hw_state_nomodeset(state, new_crtc_state);

                        continue;
                }

                if (!new_crtc_state->uapi.enable) {
                        if (!new_crtc_state->bigjoiner_slave) {
                                intel_crtc_copy_uapi_to_hw_state(state, new_crtc_state);
                                any_ms = true;
                        }
                        continue;
                }

                ret = intel_crtc_prepare_cleared_state(state, new_crtc_state);
                if (ret)
                        goto fail;

                ret = intel_modeset_pipe_config(state, new_crtc_state);
                if (ret)
                        goto fail;

                ret = intel_atomic_check_bigjoiner(state, crtc, old_crtc_state,
                                                   new_crtc_state);
                if (ret)
                        goto fail;
        }

        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                            new_crtc_state, i) {
                if (!intel_crtc_needs_modeset(new_crtc_state))
                        continue;

                ret = intel_modeset_pipe_config_late(new_crtc_state);
                if (ret)
                        goto fail;

                intel_crtc_check_fastset(old_crtc_state, new_crtc_state);
        }

        /**
         * Check if fastset is allowed by external dependencies like other
         * pipes and transcoders.
         *
         * Right now it only forces a fullmodeset when the MST master
         * transcoder did not changed but the pipe of the master transcoder
         * needs a fullmodeset so all slaves also needs to do a fullmodeset or
         * in case of port synced crtcs, if one of the synced crtcs
         * needs a full modeset, all other synced crtcs should be
         * forced a full modeset.
         */
        for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
                if (!new_crtc_state->hw.enable || intel_crtc_needs_modeset(new_crtc_state))
                        continue;

                if (intel_dp_mst_is_slave_trans(new_crtc_state)) {
                        enum transcoder master = new_crtc_state->mst_master_transcoder;

                        if (intel_cpu_transcoders_need_modeset(state, BIT(master))) {
                                new_crtc_state->uapi.mode_changed = true;
                                new_crtc_state->update_pipe = false;
                        }
                }

                if (is_trans_port_sync_mode(new_crtc_state)) {
                        u8 trans = new_crtc_state->sync_mode_slaves_mask;

                        if (new_crtc_state->master_transcoder != INVALID_TRANSCODER)
                                trans |= BIT(new_crtc_state->master_transcoder);

                        if (intel_cpu_transcoders_need_modeset(state, trans)) {
                                new_crtc_state->uapi.mode_changed = true;
                                new_crtc_state->update_pipe = false;
                        }
                }

                if (new_crtc_state->bigjoiner) {
                        struct intel_crtc_state *linked_crtc_state =
                                intel_atomic_get_new_crtc_state(state, new_crtc_state->bigjoiner_linked_crtc);

                        if (intel_crtc_needs_modeset(linked_crtc_state)) {
                                new_crtc_state->uapi.mode_changed = true;
                                new_crtc_state->update_pipe = false;
                        }
                }
        }

        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                            new_crtc_state, i) {
                if (intel_crtc_needs_modeset(new_crtc_state)) {
                        any_ms = true;
                        continue;
                }

                if (!new_crtc_state->update_pipe)
                        continue;

                intel_crtc_copy_fastset(old_crtc_state, new_crtc_state);
        }

        if (any_ms && !check_digital_port_conflicts(state)) {
                drm_dbg_kms(&dev_priv->drm,
                            "rejecting conflicting digital port configuration\n");
                ret = -EINVAL;
                goto fail;
        }

        ret = drm_dp_mst_atomic_check(&state->base);
        if (ret)
                goto fail;

        ret = intel_atomic_check_planes(state);
        if (ret)
                goto fail;

        intel_fbc_choose_crtc(dev_priv, state);
        ret = calc_watermark_data(state);
        if (ret)
                goto fail;

        ret = intel_bw_atomic_check(state);
        if (ret)
                goto fail;

        ret = intel_atomic_check_cdclk(state, &any_ms);
        if (ret)
                goto fail;

        if (intel_any_crtc_needs_modeset(state))
                any_ms = true;

        if (any_ms) {
                ret = intel_modeset_checks(state);
                if (ret)
                        goto fail;

                ret = intel_modeset_calc_cdclk(state);
                if (ret)
                        return ret;

                intel_modeset_clear_plls(state);
        }

        ret = intel_atomic_check_crtcs(state);
        if (ret)
                goto fail;

        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                            new_crtc_state, i) {
                if (new_crtc_state->uapi.async_flip) {
                        ret = intel_atomic_check_async(state);
                        if (ret)
                                goto fail;
                }

                if (!intel_crtc_needs_modeset(new_crtc_state) &&
                    !new_crtc_state->update_pipe)
                        continue;

                intel_dump_pipe_config(new_crtc_state, state,
                                       intel_crtc_needs_modeset(new_crtc_state) ?
                                       "[modeset]" : "[fastset]");
        }

        return 0;

 fail:
        if (ret == -EDEADLK)
                return ret;

        /*
         * FIXME would probably be nice to know which crtc specifically
         * caused the failure, in cases where we can pinpoint it.
         */
        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                            new_crtc_state, i)
                intel_dump_pipe_config(new_crtc_state, state, "[failed]");

        return ret;
}

static int intel_atomic_prepare_commit(struct intel_atomic_state *state)
{
        struct intel_crtc_state *crtc_state;
        struct intel_crtc *crtc;
        int i, ret;

        ret = drm_atomic_helper_prepare_planes(state->base.dev, &state->base);
        if (ret < 0)
                return ret;

        for_each_new_intel_crtc_in_state(state, crtc, crtc_state, i) {
                bool mode_changed = intel_crtc_needs_modeset(crtc_state);

                if (mode_changed || crtc_state->update_pipe ||
                    crtc_state->uapi.color_mgmt_changed) {
                        intel_dsb_prepare(crtc_state);
                }
        }

        return 0;
}

void intel_crtc_arm_fifo_underrun(struct intel_crtc *crtc,
                                  struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        if (DISPLAY_VER(dev_priv) != 2 || crtc_state->active_planes)
                intel_set_cpu_fifo_underrun_reporting(dev_priv, crtc->pipe, true);

        if (crtc_state->has_pch_encoder) {
                enum pipe pch_transcoder =
                        intel_crtc_pch_transcoder(crtc);

                intel_set_pch_fifo_underrun_reporting(dev_priv, pch_transcoder, true);
        }
}

static void intel_pipe_fastset(const struct intel_crtc_state *old_crtc_state,
                               const struct intel_crtc_state *new_crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(new_crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);

        /*
         * Update pipe size and adjust fitter if needed: the reason for this is
         * that in compute_mode_changes we check the native mode (not the pfit
         * mode) to see if we can flip rather than do a full mode set. In the
         * fastboot case, we'll flip, but if we don't update the pipesrc and
         * pfit state, we'll end up with a big fb scanned out into the wrong
         * sized surface.
         */
        intel_set_pipe_src_size(new_crtc_state);

        /* on skylake this is done by detaching scalers */
        if (DISPLAY_VER(dev_priv) >= 9) {
                if (new_crtc_state->pch_pfit.enabled)
                        skl_pfit_enable(new_crtc_state);
        } else if (HAS_PCH_SPLIT(dev_priv)) {
                if (new_crtc_state->pch_pfit.enabled)
                        ilk_pfit_enable(new_crtc_state);
                else if (old_crtc_state->pch_pfit.enabled)
                        ilk_pfit_disable(old_crtc_state);
        }

        /*
         * The register is supposedly single buffered so perhaps
         * not 100% correct to do this here. But SKL+ calculate
         * this based on the adjust pixel rate so pfit changes do
         * affect it and so it must be updated for fastsets.
         * HSW/BDW only really need this here for fastboot, after
         * that the value should not change without a full modeset.
         */
        if (DISPLAY_VER(dev_priv) >= 9 ||
            IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv))
                hsw_set_linetime_wm(new_crtc_state);

        if (DISPLAY_VER(dev_priv) >= 11)
                icl_set_pipe_chicken(new_crtc_state);
}

static void commit_pipe_pre_planes(struct intel_atomic_state *state,
                                   struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);
        const struct intel_crtc_state *old_crtc_state =
                intel_atomic_get_old_crtc_state(state, crtc);
        const struct intel_crtc_state *new_crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        bool modeset = intel_crtc_needs_modeset(new_crtc_state);

        /*
         * During modesets pipe configuration was programmed as the
         * CRTC was enabled.
         */
        if (!modeset) {
                if (new_crtc_state->uapi.color_mgmt_changed ||
                    new_crtc_state->update_pipe)
                        intel_color_commit(new_crtc_state);

                if (DISPLAY_VER(dev_priv) >= 9 || IS_BROADWELL(dev_priv))
                        bdw_set_pipemisc(new_crtc_state);

                if (new_crtc_state->update_pipe)
                        intel_pipe_fastset(old_crtc_state, new_crtc_state);

                intel_psr2_program_trans_man_trk_ctl(new_crtc_state);
        }

        if (dev_priv->display.atomic_update_watermarks)
                dev_priv->display.atomic_update_watermarks(state, crtc);
}

static void commit_pipe_post_planes(struct intel_atomic_state *state,
                                    struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);
        const struct intel_crtc_state *new_crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);

        /*
         * Disable the scaler(s) after the plane(s) so that we don't
         * get a catastrophic underrun even if the two operations
         * end up happening in two different frames.
         */
        if (DISPLAY_VER(dev_priv) >= 9 &&
            !intel_crtc_needs_modeset(new_crtc_state))
                skl_detach_scalers(new_crtc_state);
}

static void intel_enable_crtc(struct intel_atomic_state *state,
                              struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);
        const struct intel_crtc_state *new_crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);

        if (!intel_crtc_needs_modeset(new_crtc_state))
                return;

        intel_crtc_update_active_timings(new_crtc_state);

        dev_priv->display.crtc_enable(state, crtc);

        if (new_crtc_state->bigjoiner_slave)
                return;

        /* vblanks work again, re-enable pipe CRC. */
        intel_crtc_enable_pipe_crc(crtc);
}

static void intel_update_crtc(struct intel_atomic_state *state,
                              struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);
        const struct intel_crtc_state *old_crtc_state =
                intel_atomic_get_old_crtc_state(state, crtc);
        struct intel_crtc_state *new_crtc_state =
                intel_atomic_get_new_crtc_state(state, crtc);
        bool modeset = intel_crtc_needs_modeset(new_crtc_state);

        if (!modeset) {
                if (new_crtc_state->preload_luts &&
                    (new_crtc_state->uapi.color_mgmt_changed ||
                     new_crtc_state->update_pipe))
                        intel_color_load_luts(new_crtc_state);

                intel_pre_plane_update(state, crtc);

                if (new_crtc_state->update_pipe)
                        intel_encoders_update_pipe(state, crtc);
        }

        intel_fbc_update(state, crtc);

        /* Perform vblank evasion around commit operation */
        intel_pipe_update_start(new_crtc_state);

        commit_pipe_pre_planes(state, crtc);

        if (DISPLAY_VER(dev_priv) >= 9)
                skl_update_planes_on_crtc(state, crtc);
        else
                i9xx_update_planes_on_crtc(state, crtc);

        commit_pipe_post_planes(state, crtc);

        intel_pipe_update_end(new_crtc_state);

        /*
         * We usually enable FIFO underrun interrupts as part of the
         * CRTC enable sequence during modesets.  But when we inherit a
         * valid pipe configuration from the BIOS we need to take care
         * of enabling them on the CRTC's first fastset.
         */
        if (new_crtc_state->update_pipe && !modeset &&
            old_crtc_state->inherited)
                intel_crtc_arm_fifo_underrun(crtc, new_crtc_state);
}

static void intel_old_crtc_state_disables(struct intel_atomic_state *state,
                                          struct intel_crtc_state *old_crtc_state,
                                          struct intel_crtc_state *new_crtc_state,
                                          struct intel_crtc *crtc)
{
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);

        drm_WARN_ON(&dev_priv->drm, old_crtc_state->bigjoiner_slave);

        intel_encoders_pre_disable(state, crtc);

        intel_crtc_disable_planes(state, crtc);

        /*
         * We still need special handling for disabling bigjoiner master
         * and slaves since for slave we do not have encoder or plls
         * so we dont need to disable those.
         */
        if (old_crtc_state->bigjoiner) {
                intel_crtc_disable_planes(state,
                                          old_crtc_state->bigjoiner_linked_crtc);
                old_crtc_state->bigjoiner_linked_crtc->active = false;
        }

        /*
         * We need to disable pipe CRC before disabling the pipe,
         * or we race against vblank off.
         */
        intel_crtc_disable_pipe_crc(crtc);

        dev_priv->display.crtc_disable(state, crtc);
        crtc->active = false;
        intel_fbc_disable(crtc);
        intel_disable_shared_dpll(old_crtc_state);

        /* FIXME unify this for all platforms */
        if (!new_crtc_state->hw.active &&
            !HAS_GMCH(dev_priv) &&
            dev_priv->display.initial_watermarks)
                dev_priv->display.initial_watermarks(state, crtc);
}

static void intel_commit_modeset_disables(struct intel_atomic_state *state)
{
        struct intel_crtc_state *new_crtc_state, *old_crtc_state;
        struct intel_crtc *crtc;
        u32 handled = 0;
        int i;

        /* Only disable port sync and MST slaves */
        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                            new_crtc_state, i) {
                if (!intel_crtc_needs_modeset(new_crtc_state) || old_crtc_state->bigjoiner)
                        continue;

                if (!old_crtc_state->hw.active)
                        continue;

                /* In case of Transcoder port Sync master slave CRTCs can be
                 * assigned in any order and we need to make sure that
                 * slave CRTCs are disabled first and then master CRTC since
                 * Slave vblanks are masked till Master Vblanks.
                 */
                if (!is_trans_port_sync_slave(old_crtc_state) &&
                    !intel_dp_mst_is_slave_trans(old_crtc_state))
                        continue;

                intel_pre_plane_update(state, crtc);
                intel_old_crtc_state_disables(state, old_crtc_state,
                                              new_crtc_state, crtc);
                handled |= BIT(crtc->pipe);
        }

        /* Disable everything else left on */
        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                            new_crtc_state, i) {
                if (!intel_crtc_needs_modeset(new_crtc_state) ||
                    (handled & BIT(crtc->pipe)) ||
                    old_crtc_state->bigjoiner_slave)
                        continue;

                intel_pre_plane_update(state, crtc);
                if (old_crtc_state->bigjoiner) {
                        struct intel_crtc *slave =
                                old_crtc_state->bigjoiner_linked_crtc;

                        intel_pre_plane_update(state, slave);
                }

                if (old_crtc_state->hw.active)
                        intel_old_crtc_state_disables(state, old_crtc_state,
                                                      new_crtc_state, crtc);
        }
}

static void intel_commit_modeset_enables(struct intel_atomic_state *state)
{
        struct intel_crtc_state *new_crtc_state;
        struct intel_crtc *crtc;
        int i;

        for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
                if (!new_crtc_state->hw.active)
                        continue;

                intel_enable_crtc(state, crtc);
                intel_update_crtc(state, crtc);
        }
}

static void skl_commit_modeset_enables(struct intel_atomic_state *state)
{
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);
        struct intel_crtc *crtc;
        struct intel_crtc_state *old_crtc_state, *new_crtc_state;
        struct skl_ddb_entry entries[I915_MAX_PIPES] = {};
        u8 update_pipes = 0, modeset_pipes = 0;
        int i;

        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
                enum pipe pipe = crtc->pipe;

                if (!new_crtc_state->hw.active)
                        continue;

                /* ignore allocations for crtc's that have been turned off. */
                if (!intel_crtc_needs_modeset(new_crtc_state)) {
                        entries[pipe] = old_crtc_state->wm.skl.ddb;
                        update_pipes |= BIT(pipe);
                } else {
                        modeset_pipes |= BIT(pipe);
                }
        }

        /*
         * Whenever the number of active pipes changes, we need to make sure we
         * update the pipes in the right order so that their ddb allocations
         * never overlap with each other between CRTC updates. Otherwise we'll
         * cause pipe underruns and other bad stuff.
         *
         * So first lets enable all pipes that do not need a fullmodeset as
         * those don't have any external dependency.
         */
        while (update_pipes) {
                for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                                    new_crtc_state, i) {
                        enum pipe pipe = crtc->pipe;

                        if ((update_pipes & BIT(pipe)) == 0)
                                continue;

                        if (skl_ddb_allocation_overlaps(&new_crtc_state->wm.skl.ddb,
                                                        entries, I915_MAX_PIPES, pipe))
                                continue;

                        entries[pipe] = new_crtc_state->wm.skl.ddb;
                        update_pipes &= ~BIT(pipe);

                        intel_update_crtc(state, crtc);

                        /*
                         * If this is an already active pipe, it's DDB changed,
                         * and this isn't the last pipe that needs updating
                         * then we need to wait for a vblank to pass for the
                         * new ddb allocation to take effect.
                         */
                        if (!skl_ddb_entry_equal(&new_crtc_state->wm.skl.ddb,
                                                 &old_crtc_state->wm.skl.ddb) &&
                            (update_pipes | modeset_pipes))
                                intel_wait_for_vblank(dev_priv, pipe);
                }
        }

        update_pipes = modeset_pipes;

        /*
         * Enable all pipes that needs a modeset and do not depends on other
         * pipes
         */
        for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
                enum pipe pipe = crtc->pipe;

                if ((modeset_pipes & BIT(pipe)) == 0)
                        continue;

                if (intel_dp_mst_is_slave_trans(new_crtc_state) ||
                    is_trans_port_sync_master(new_crtc_state) ||
                    (new_crtc_state->bigjoiner && !new_crtc_state->bigjoiner_slave))
                        continue;

                modeset_pipes &= ~BIT(pipe);

                intel_enable_crtc(state, crtc);
        }

        /*
         * Then we enable all remaining pipes that depend on other
         * pipes: MST slaves and port sync masters, big joiner master
         */
        for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
                enum pipe pipe = crtc->pipe;

                if ((modeset_pipes & BIT(pipe)) == 0)
                        continue;

                modeset_pipes &= ~BIT(pipe);

                intel_enable_crtc(state, crtc);
        }

        /*
         * Finally we do the plane updates/etc. for all pipes that got enabled.
         */
        for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
                enum pipe pipe = crtc->pipe;

                if ((update_pipes & BIT(pipe)) == 0)
                        continue;

                drm_WARN_ON(&dev_priv->drm, skl_ddb_allocation_overlaps(&new_crtc_state->wm.skl.ddb,
                                                                        entries, I915_MAX_PIPES, pipe));

                entries[pipe] = new_crtc_state->wm.skl.ddb;
                update_pipes &= ~BIT(pipe);

                intel_update_crtc(state, crtc);
        }

        drm_WARN_ON(&dev_priv->drm, modeset_pipes);
        drm_WARN_ON(&dev_priv->drm, update_pipes);
}

static void intel_atomic_helper_free_state(struct drm_i915_private *dev_priv)
{
        struct intel_atomic_state *state, *next;
        struct llist_node *freed;

        freed = llist_del_all(&dev_priv->atomic_helper.free_list);
        llist_for_each_entry_safe(state, next, freed, freed)
                drm_atomic_state_put(&state->base);
}

static void intel_atomic_helper_free_state_worker(struct work_struct *work)
{
        struct drm_i915_private *dev_priv =
                container_of(work, typeof(*dev_priv), atomic_helper.free_work);

        intel_atomic_helper_free_state(dev_priv);
}

static void intel_atomic_commit_fence_wait(struct intel_atomic_state *intel_state)
{
        struct wait_queue_entry wait_fence, wait_reset;
        struct drm_i915_private *dev_priv = to_i915(intel_state->base.dev);

        init_wait_entry(&wait_fence, 0);
        init_wait_entry(&wait_reset, 0);
        for (;;) {
                prepare_to_wait(&intel_state->commit_ready.wait,
                                &wait_fence, TASK_UNINTERRUPTIBLE);
                prepare_to_wait(bit_waitqueue(&dev_priv->gt.reset.flags,
                                              I915_RESET_MODESET),
                                &wait_reset, TASK_UNINTERRUPTIBLE);


                if (i915_sw_fence_done(&intel_state->commit_ready) ||
                    test_bit(I915_RESET_MODESET, &dev_priv->gt.reset.flags))
                        break;

                schedule();
        }
        finish_wait(&intel_state->commit_ready.wait, &wait_fence);
        finish_wait(bit_waitqueue(&dev_priv->gt.reset.flags,
                                  I915_RESET_MODESET),
                    &wait_reset);
}

static void intel_cleanup_dsbs(struct intel_atomic_state *state)
{
        struct intel_crtc_state *old_crtc_state, *new_crtc_state;
        struct intel_crtc *crtc;
        int i;

        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                            new_crtc_state, i)
                intel_dsb_cleanup(old_crtc_state);
}

static void intel_atomic_cleanup_work(struct work_struct *work)
{
        struct intel_atomic_state *state =
                container_of(work, struct intel_atomic_state, base.commit_work);
        struct drm_i915_private *i915 = to_i915(state->base.dev);

        intel_cleanup_dsbs(state);
        drm_atomic_helper_cleanup_planes(&i915->drm, &state->base);
        drm_atomic_helper_commit_cleanup_done(&state->base);
        drm_atomic_state_put(&state->base);

        intel_atomic_helper_free_state(i915);
}

static void intel_atomic_prepare_plane_clear_colors(struct intel_atomic_state *state)
{
        struct drm_i915_private *i915 = to_i915(state->base.dev);
        struct intel_plane *plane;
        struct intel_plane_state *plane_state;
        int i;

        for_each_new_intel_plane_in_state(state, plane, plane_state, i) {
                struct drm_framebuffer *fb = plane_state->hw.fb;
                int ret;

                if (!fb ||
                    fb->modifier != I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS_CC)
                        continue;

                /*
                 * The layout of the fast clear color value expected by HW
                 * (the DRM ABI requiring this value to be located in fb at offset 0 of plane#2):
                 * - 4 x 4 bytes per-channel value
                 *   (in surface type specific float/int format provided by the fb user)
                 * - 8 bytes native color value used by the display
                 *   (converted/written by GPU during a fast clear operation using the
                 *    above per-channel values)
                 *
                 * The commit's FB prepare hook already ensured that FB obj is pinned and the
                 * caller made sure that the object is synced wrt. the related color clear value
                 * GPU write on it.
                 */
                ret = i915_gem_object_read_from_page(intel_fb_obj(fb),
                                                     fb->offsets[2] + 16,
                                                     &plane_state->ccval,
                                                     sizeof(plane_state->ccval));
                /* The above could only fail if the FB obj has an unexpected backing store type. */
                drm_WARN_ON(&i915->drm, ret);
        }
}

static void intel_atomic_commit_tail(struct intel_atomic_state *state)
{
        struct drm_device *dev = state->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_crtc_state *new_crtc_state, *old_crtc_state;
        struct intel_crtc *crtc;
        u64 put_domains[I915_MAX_PIPES] = {};
        intel_wakeref_t wakeref = 0;
        int i;

        intel_atomic_commit_fence_wait(state);

        drm_atomic_helper_wait_for_dependencies(&state->base);

        if (state->modeset)
                wakeref = intel_display_power_get(dev_priv, POWER_DOMAIN_MODESET);

        intel_atomic_prepare_plane_clear_colors(state);

        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                            new_crtc_state, i) {
                if (intel_crtc_needs_modeset(new_crtc_state) ||
                    new_crtc_state->update_pipe) {

                        put_domains[crtc->pipe] =
                                modeset_get_crtc_power_domains(new_crtc_state);
                }
        }

        intel_commit_modeset_disables(state);

        /* FIXME: Eventually get rid of our crtc->config pointer */
        for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i)
                crtc->config = new_crtc_state;

        if (state->modeset) {
                drm_atomic_helper_update_legacy_modeset_state(dev, &state->base);

                intel_set_cdclk_pre_plane_update(state);

                intel_modeset_verify_disabled(dev_priv, state);
        }

        intel_sagv_pre_plane_update(state);

        /* Complete the events for pipes that have now been disabled */
        for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
                bool modeset = intel_crtc_needs_modeset(new_crtc_state);

                /* Complete events for now disable pipes here. */
                if (modeset && !new_crtc_state->hw.active && new_crtc_state->uapi.event) {
                        spin_lock_irq(&dev->event_lock);
                        drm_crtc_send_vblank_event(&crtc->base,
                                                   new_crtc_state->uapi.event);
                        spin_unlock_irq(&dev->event_lock);

                        new_crtc_state->uapi.event = NULL;
                }
        }

        if (state->modeset)
                intel_encoders_update_prepare(state);

        intel_dbuf_pre_plane_update(state);

        for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
                if (new_crtc_state->uapi.async_flip)
                        intel_crtc_enable_flip_done(state, crtc);
        }

        /* Now enable the clocks, plane, pipe, and connectors that we set up. */
        dev_priv->display.commit_modeset_enables(state);

        if (state->modeset) {
                intel_encoders_update_complete(state);

                intel_set_cdclk_post_plane_update(state);
        }

        /* FIXME: We should call drm_atomic_helper_commit_hw_done() here
         * already, but still need the state for the delayed optimization. To
         * fix this:
         * - wrap the optimization/post_plane_update stuff into a per-crtc work.
         * - schedule that vblank worker _before_ calling hw_done
         * - at the start of commit_tail, cancel it _synchrously
         * - switch over to the vblank wait helper in the core after that since
         *   we don't need out special handling any more.
         */
        drm_atomic_helper_wait_for_flip_done(dev, &state->base);

        for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
                if (new_crtc_state->uapi.async_flip)
                        intel_crtc_disable_flip_done(state, crtc);

                if (new_crtc_state->hw.active &&
                    !intel_crtc_needs_modeset(new_crtc_state) &&
                    !new_crtc_state->preload_luts &&
                    (new_crtc_state->uapi.color_mgmt_changed ||
                     new_crtc_state->update_pipe))
                        intel_color_load_luts(new_crtc_state);
        }

        /*
         * Now that the vblank has passed, we can go ahead and program the
         * optimal watermarks on platforms that need two-step watermark
         * programming.
         *
         * TODO: Move this (and other cleanup) to an async worker eventually.
         */
        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
                                            new_crtc_state, i) {
                /*
                 * Gen2 reports pipe underruns whenever all planes are disabled.
                 * So re-enable underrun reporting after some planes get enabled.
                 *
                 * We do this before .optimize_watermarks() so that we have a
                 * chance of catching underruns with the intermediate watermarks
                 * vs. the new plane configuration.
                 */
                if (DISPLAY_VER(dev_priv) == 2 && planes_enabling(old_crtc_state, new_crtc_state))
                        intel_set_cpu_fifo_underrun_reporting(dev_priv, crtc->pipe, true);

                if (dev_priv->display.optimize_watermarks)
                        dev_priv->display.optimize_watermarks(state, crtc);
        }

        intel_dbuf_post_plane_update(state);

        for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
                intel_post_plane_update(state, crtc);

                modeset_put_crtc_power_domains(crtc, put_domains[crtc->pipe]);

                intel_modeset_verify_crtc(crtc, state, old_crtc_state, new_crtc_state);

                /*
                 * DSB cleanup is done in cleanup_work aligning with framebuffer
                 * cleanup. So copy and reset the dsb structure to sync with
                 * commit_done and later do dsb cleanup in cleanup_work.
                 */
                old_crtc_state->dsb = fetch_and_zero(&new_crtc_state->dsb);
        }

        /* Underruns don't always raise interrupts, so check manually */
        intel_check_cpu_fifo_underruns(dev_priv);
        intel_check_pch_fifo_underruns(dev_priv);

        if (state->modeset)
                intel_verify_planes(state);

        intel_sagv_post_plane_update(state);

        drm_atomic_helper_commit_hw_done(&state->base);

        if (state->modeset) {
                /* As one of the primary mmio accessors, KMS has a high
                 * likelihood of triggering bugs in unclaimed access. After we
                 * finish modesetting, see if an error has been flagged, and if
                 * so enable debugging for the next modeset - and hope we catch
                 * the culprit.
                 */
                intel_uncore_arm_unclaimed_mmio_detection(&dev_priv->uncore);
                intel_display_power_put(dev_priv, POWER_DOMAIN_MODESET, wakeref);
        }
        intel_runtime_pm_put(&dev_priv->runtime_pm, state->wakeref);

        /*
         * Defer the cleanup of the old state to a separate worker to not
         * impede the current task (userspace for blocking modesets) that
         * are executed inline. For out-of-line asynchronous modesets/flips,
         * deferring to a new worker seems overkill, but we would place a
         * schedule point (cond_resched()) here anyway to keep latencies
         * down.
         */
        INIT_WORK(&state->base.commit_work, intel_atomic_cleanup_work);
        queue_work(system_highpri_wq, &state->base.commit_work);
}

static void intel_atomic_commit_work(struct work_struct *work)
{
        struct intel_atomic_state *state =
                container_of(work, struct intel_atomic_state, base.commit_work);

        intel_atomic_commit_tail(state);
}

static int __i915_sw_fence_call
intel_atomic_commit_ready(struct i915_sw_fence *fence,
                          enum i915_sw_fence_notify notify)
{
        struct intel_atomic_state *state =
                container_of(fence, struct intel_atomic_state, commit_ready);

        switch (notify) {
        case FENCE_COMPLETE:
                /* we do blocking waits in the worker, nothing to do here */
                break;
        case FENCE_FREE:
                {
                        struct intel_atomic_helper *helper =
                                &to_i915(state->base.dev)->atomic_helper;

                        if (llist_add(&state->freed, &helper->free_list))
                                schedule_work(&helper->free_work);
                        break;
                }
        }

        return NOTIFY_DONE;
}

static void intel_atomic_track_fbs(struct intel_atomic_state *state)
{
        struct intel_plane_state *old_plane_state, *new_plane_state;
        struct intel_plane *plane;
        int i;

        for_each_oldnew_intel_plane_in_state(state, plane, old_plane_state,
                                             new_plane_state, i)
                intel_frontbuffer_track(to_intel_frontbuffer(old_plane_state->hw.fb),
                                        to_intel_frontbuffer(new_plane_state->hw.fb),
                                        plane->frontbuffer_bit);
}

static int intel_atomic_commit(struct drm_device *dev,
                               struct drm_atomic_state *_state,
                               bool nonblock)
{
        struct intel_atomic_state *state = to_intel_atomic_state(_state);
        struct drm_i915_private *dev_priv = to_i915(dev);
        int ret = 0;

        state->wakeref = intel_runtime_pm_get(&dev_priv->runtime_pm);

        drm_atomic_state_get(&state->base);
        i915_sw_fence_init(&state->commit_ready,
                           intel_atomic_commit_ready);

        /*
         * The intel_legacy_cursor_update() fast path takes care
         * of avoiding the vblank waits for simple cursor
         * movement and flips. For cursor on/off and size changes,
         * we want to perform the vblank waits so that watermark
         * updates happen during the correct frames. Gen9+ have
         * double buffered watermarks and so shouldn't need this.
         *
         * Unset state->legacy_cursor_update before the call to
         * drm_atomic_helper_setup_commit() because otherwise
         * drm_atomic_helper_wait_for_flip_done() is a noop and
         * we get FIFO underruns because we didn't wait
         * for vblank.
         *
         * FIXME doing watermarks and fb cleanup from a vblank worker
         * (assuming we had any) would solve these problems.
         */
        if (DISPLAY_VER(dev_priv) < 9 && state->base.legacy_cursor_update) {
                struct intel_crtc_state *new_crtc_state;
                struct intel_crtc *crtc;
                int i;

                for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i)
                        if (new_crtc_state->wm.need_postvbl_update ||
                            new_crtc_state->update_wm_post)
                                state->base.legacy_cursor_update = false;
        }

        ret = intel_atomic_prepare_commit(state);
        if (ret) {
                drm_dbg_atomic(&dev_priv->drm,
                               "Preparing state failed with %i\n", ret);
                i915_sw_fence_commit(&state->commit_ready);
                intel_runtime_pm_put(&dev_priv->runtime_pm, state->wakeref);
                return ret;
        }

        ret = drm_atomic_helper_setup_commit(&state->base, nonblock);
        if (!ret)
                ret = drm_atomic_helper_swap_state(&state->base, true);
        if (!ret)
                intel_atomic_swap_global_state(state);

        if (ret) {
                struct intel_crtc_state *new_crtc_state;
                struct intel_crtc *crtc;
                int i;

                i915_sw_fence_commit(&state->commit_ready);

                for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i)
                        intel_dsb_cleanup(new_crtc_state);

                drm_atomic_helper_cleanup_planes(dev, &state->base);
                intel_runtime_pm_put(&dev_priv->runtime_pm, state->wakeref);
                return ret;
        }
        intel_shared_dpll_swap_state(state);
        intel_atomic_track_fbs(state);

        drm_atomic_state_get(&state->base);
        INIT_WORK(&state->base.commit_work, intel_atomic_commit_work);

        i915_sw_fence_commit(&state->commit_ready);
        if (nonblock && state->modeset) {
                queue_work(dev_priv->modeset_wq, &state->base.commit_work);
        } else if (nonblock) {
                queue_work(dev_priv->flip_wq, &state->base.commit_work);
        } else {
                if (state->modeset)
                        flush_workqueue(dev_priv->modeset_wq);
                intel_atomic_commit_tail(state);
        }

        return 0;
}

struct wait_rps_boost {
        struct wait_queue_entry wait;

        struct drm_crtc *crtc;
        struct i915_request *request;
};

static int do_rps_boost(struct wait_queue_entry *_wait,
                        unsigned mode, int sync, void *key)
{
        struct wait_rps_boost *wait = container_of(_wait, typeof(*wait), wait);
        struct i915_request *rq = wait->request;

        /*
         * If we missed the vblank, but the request is already running it
         * is reasonable to assume that it will complete before the next
         * vblank without our intervention, so leave RPS alone.
         */
        if (!i915_request_started(rq))
                intel_rps_boost(rq);
        i915_request_put(rq);

        drm_crtc_vblank_put(wait->crtc);

        list_del(&wait->wait.entry);
        kfree(wait);
        return 1;
}

static void add_rps_boost_after_vblank(struct drm_crtc *crtc,
                                       struct dma_fence *fence)
{
        struct wait_rps_boost *wait;

        if (!dma_fence_is_i915(fence))
                return;

        if (DISPLAY_VER(to_i915(crtc->dev)) < 6)
                return;

        if (drm_crtc_vblank_get(crtc))
                return;

        wait = kmalloc(sizeof(*wait), GFP_KERNEL);
        if (!wait) {
                drm_crtc_vblank_put(crtc);
                return;
        }

        wait->request = to_request(dma_fence_get(fence));
        wait->crtc = crtc;

        wait->wait.func = do_rps_boost;
        wait->wait.flags = 0;

        add_wait_queue(drm_crtc_vblank_waitqueue(crtc), &wait->wait);
}

int intel_plane_pin_fb(struct intel_plane_state *plane_state)
{
        struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
        struct drm_framebuffer *fb = plane_state->hw.fb;
        struct i915_vma *vma;
        bool phys_cursor =
                plane->id == PLANE_CURSOR &&
                INTEL_INFO(dev_priv)->display.cursor_needs_physical;

        if (!intel_fb_uses_dpt(fb)) {
                vma = intel_pin_and_fence_fb_obj(fb, phys_cursor,
                                                 &plane_state->view.gtt,
                                                 intel_plane_uses_fence(plane_state),
                                                 &plane_state->flags);
                if (IS_ERR(vma))
                        return PTR_ERR(vma);

                plane_state->ggtt_vma = vma;
        } else {
                struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);

                vma = intel_dpt_pin(intel_fb->dpt_vm);
                if (IS_ERR(vma))
                        return PTR_ERR(vma);

                plane_state->ggtt_vma = vma;

                vma = intel_pin_fb_obj_dpt(fb, &plane_state->view.gtt, false,
                                           &plane_state->flags, intel_fb->dpt_vm);
                if (IS_ERR(vma)) {
                        intel_dpt_unpin(intel_fb->dpt_vm);
                        plane_state->ggtt_vma = NULL;
                        return PTR_ERR(vma);
                }

                plane_state->dpt_vma = vma;

                WARN_ON(plane_state->ggtt_vma == plane_state->dpt_vma);
        }

        return 0;
}

void intel_plane_unpin_fb(struct intel_plane_state *old_plane_state)
{
        struct drm_framebuffer *fb = old_plane_state->hw.fb;
        struct i915_vma *vma;

        if (!intel_fb_uses_dpt(fb)) {
                vma = fetch_and_zero(&old_plane_state->ggtt_vma);
                if (vma)
                        intel_unpin_fb_vma(vma, old_plane_state->flags);
        } else {
                struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);

                vma = fetch_and_zero(&old_plane_state->dpt_vma);
                if (vma)
                        intel_unpin_fb_vma(vma, old_plane_state->flags);

                vma = fetch_and_zero(&old_plane_state->ggtt_vma);
                if (vma)
                        intel_dpt_unpin(intel_fb->dpt_vm);
        }
}

/**
 * intel_prepare_plane_fb - Prepare fb for usage on plane
 * @_plane: drm plane to prepare for
 * @_new_plane_state: the plane state being prepared
 *
 * Prepares a framebuffer for usage on a display plane.  Generally this
 * involves pinning the underlying object and updating the frontbuffer tracking
 * bits.  Some older platforms need special physical address handling for
 * cursor planes.
 *
 * Returns 0 on success, negative error code on failure.
 */
int
intel_prepare_plane_fb(struct drm_plane *_plane,
                       struct drm_plane_state *_new_plane_state)
{
        struct i915_sched_attr attr = { .priority = I915_PRIORITY_DISPLAY };
        struct intel_plane *plane = to_intel_plane(_plane);
        struct intel_plane_state *new_plane_state =
                to_intel_plane_state(_new_plane_state);
        struct intel_atomic_state *state =
                to_intel_atomic_state(new_plane_state->uapi.state);
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
        const struct intel_plane_state *old_plane_state =
                intel_atomic_get_old_plane_state(state, plane);
        struct drm_i915_gem_object *obj = intel_fb_obj(new_plane_state->hw.fb);
        struct drm_i915_gem_object *old_obj = intel_fb_obj(old_plane_state->hw.fb);
        int ret;

        if (old_obj) {
                const struct intel_crtc_state *crtc_state =
                        intel_atomic_get_new_crtc_state(state,
                                                        to_intel_crtc(old_plane_state->hw.crtc));

                /* Big Hammer, we also need to ensure that any pending
                 * MI_WAIT_FOR_EVENT inside a user batch buffer on the
                 * current scanout is retired before unpinning the old
                 * framebuffer. Note that we rely on userspace rendering
                 * into the buffer attached to the pipe they are waiting
                 * on. If not, userspace generates a GPU hang with IPEHR
                 * point to the MI_WAIT_FOR_EVENT.
                 *
                 * This should only fail upon a hung GPU, in which case we
                 * can safely continue.
                 */
                if (intel_crtc_needs_modeset(crtc_state)) {
                        ret = i915_sw_fence_await_reservation(&state->commit_ready,
                                                              old_obj->base.resv, NULL,
                                                              false, 0,
                                                              GFP_KERNEL);
                        if (ret < 0)
                                return ret;
                }
        }

        if (new_plane_state->uapi.fence) { /* explicit fencing */
                i915_gem_fence_wait_priority(new_plane_state->uapi.fence,
                                             &attr);
                ret = i915_sw_fence_await_dma_fence(&state->commit_ready,
                                                    new_plane_state->uapi.fence,
                                                    i915_fence_timeout(dev_priv),
                                                    GFP_KERNEL);
                if (ret < 0)
                        return ret;
        }

        if (!obj)
                return 0;


        ret = intel_plane_pin_fb(new_plane_state);
        if (ret)
                return ret;

        i915_gem_object_wait_priority(obj, 0, &attr);
        i915_gem_object_flush_frontbuffer(obj, ORIGIN_DIRTYFB);

        if (!new_plane_state->uapi.fence) { /* implicit fencing */
                struct dma_fence *fence;

                ret = i915_sw_fence_await_reservation(&state->commit_ready,
                                                      obj->base.resv, NULL,
                                                      false,
                                                      i915_fence_timeout(dev_priv),
                                                      GFP_KERNEL);
                if (ret < 0)
                        goto unpin_fb;

                fence = dma_resv_get_excl_unlocked(obj->base.resv);
                if (fence) {
                        add_rps_boost_after_vblank(new_plane_state->hw.crtc,
                                                   fence);
                        dma_fence_put(fence);
                }
        } else {
                add_rps_boost_after_vblank(new_plane_state->hw.crtc,
                                           new_plane_state->uapi.fence);
        }

        /*
         * We declare pageflips to be interactive and so merit a small bias
         * towards upclocking to deliver the frame on time. By only changing
         * the RPS thresholds to sample more regularly and aim for higher
         * clocks we can hopefully deliver low power workloads (like kodi)
         * that are not quite steady state without resorting to forcing
         * maximum clocks following a vblank miss (see do_rps_boost()).
         */
        if (!state->rps_interactive) {
                intel_rps_mark_interactive(&dev_priv->gt.rps, true);
                state->rps_interactive = true;
        }

        return 0;

unpin_fb:
        intel_plane_unpin_fb(new_plane_state);

        return ret;
}

/**
 * intel_cleanup_plane_fb - Cleans up an fb after plane use
 * @plane: drm plane to clean up for
 * @_old_plane_state: the state from the previous modeset
 *
 * Cleans up a framebuffer that has just been removed from a plane.
 */
void
intel_cleanup_plane_fb(struct drm_plane *plane,
                       struct drm_plane_state *_old_plane_state)
{
        struct intel_plane_state *old_plane_state =
                to_intel_plane_state(_old_plane_state);
        struct intel_atomic_state *state =
                to_intel_atomic_state(old_plane_state->uapi.state);
        struct drm_i915_private *dev_priv = to_i915(plane->dev);
        struct drm_i915_gem_object *obj = intel_fb_obj(old_plane_state->hw.fb);

        if (!obj)
                return;

        if (state->rps_interactive) {
                intel_rps_mark_interactive(&dev_priv->gt.rps, false);
                state->rps_interactive = false;
        }

        /* Should only be called after a successful intel_prepare_plane_fb()! */
        intel_plane_unpin_fb(old_plane_state);
}

/**
 * intel_plane_destroy - destroy a plane
 * @plane: plane to destroy
 *
 * Common destruction function for all types of planes (primary, cursor,
 * sprite).
 */
void intel_plane_destroy(struct drm_plane *plane)
{
        drm_plane_cleanup(plane);
        kfree(to_intel_plane(plane));
}

static void intel_plane_possible_crtcs_init(struct drm_i915_private *dev_priv)
{
        struct intel_plane *plane;

        for_each_intel_plane(&dev_priv->drm, plane) {
                struct intel_crtc *crtc = intel_get_crtc_for_pipe(dev_priv,
                                                                  plane->pipe);

                plane->base.possible_crtcs = drm_crtc_mask(&crtc->base);
        }
}


int intel_get_pipe_from_crtc_id_ioctl(struct drm_device *dev, void *data,
                                      struct drm_file *file)
{
        struct drm_i915_get_pipe_from_crtc_id *pipe_from_crtc_id = data;
        struct drm_crtc *drmmode_crtc;
        struct intel_crtc *crtc;

        drmmode_crtc = drm_crtc_find(dev, file, pipe_from_crtc_id->crtc_id);
        if (!drmmode_crtc)
                return -ENOENT;

        crtc = to_intel_crtc(drmmode_crtc);
        pipe_from_crtc_id->pipe = crtc->pipe;

        return 0;
}

static u32 intel_encoder_possible_clones(struct intel_encoder *encoder)
{
        struct drm_device *dev = encoder->base.dev;
        struct intel_encoder *source_encoder;
        u32 possible_clones = 0;

        for_each_intel_encoder(dev, source_encoder) {
                if (encoders_cloneable(encoder, source_encoder))
                        possible_clones |= drm_encoder_mask(&source_encoder->base);
        }

        return possible_clones;
}

static u32 intel_encoder_possible_crtcs(struct intel_encoder *encoder)
{
        struct drm_device *dev = encoder->base.dev;
        struct intel_crtc *crtc;
        u32 possible_crtcs = 0;

        for_each_intel_crtc(dev, crtc) {
                if (encoder->pipe_mask & BIT(crtc->pipe))
                        possible_crtcs |= drm_crtc_mask(&crtc->base);
        }

        return possible_crtcs;
}

static bool ilk_has_edp_a(struct drm_i915_private *dev_priv)
{
        if (!IS_MOBILE(dev_priv))
                return false;

        if ((intel_de_read(dev_priv, DP_A) & DP_DETECTED) == 0)
                return false;

        if (IS_IRONLAKE(dev_priv) && (intel_de_read(dev_priv, FUSE_STRAP) & ILK_eDP_A_DISABLE))
                return false;

        return true;
}

static bool intel_ddi_crt_present(struct drm_i915_private *dev_priv)
{
        if (DISPLAY_VER(dev_priv) >= 9)
                return false;

        if (IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv))
                return false;

        if (HAS_PCH_LPT_H(dev_priv) &&
            intel_de_read(dev_priv, SFUSE_STRAP) & SFUSE_STRAP_CRT_DISABLED)
                return false;

        /* DDI E can't be used if DDI A requires 4 lanes */
        if (intel_de_read(dev_priv, DDI_BUF_CTL(PORT_A)) & DDI_A_4_LANES)
                return false;

        if (!dev_priv->vbt.int_crt_support)
                return false;

        return true;
}

static void intel_setup_outputs(struct drm_i915_private *dev_priv)
{
        struct intel_encoder *encoder;
        bool dpd_is_edp = false;

        intel_pps_unlock_regs_wa(dev_priv);

        if (!HAS_DISPLAY(dev_priv))
                return;

        if (IS_DG2(dev_priv)) {
                intel_ddi_init(dev_priv, PORT_A);
                intel_ddi_init(dev_priv, PORT_B);
                intel_ddi_init(dev_priv, PORT_C);
                intel_ddi_init(dev_priv, PORT_D_XELPD);
        } else if (IS_ALDERLAKE_P(dev_priv)) {
                intel_ddi_init(dev_priv, PORT_A);
                intel_ddi_init(dev_priv, PORT_B);
                intel_ddi_init(dev_priv, PORT_TC1);
                intel_ddi_init(dev_priv, PORT_TC2);
                intel_ddi_init(dev_priv, PORT_TC3);
                intel_ddi_init(dev_priv, PORT_TC4);
        } else if (IS_ALDERLAKE_S(dev_priv)) {
                intel_ddi_init(dev_priv, PORT_A);
                intel_ddi_init(dev_priv, PORT_TC1);
                intel_ddi_init(dev_priv, PORT_TC2);
                intel_ddi_init(dev_priv, PORT_TC3);
                intel_ddi_init(dev_priv, PORT_TC4);
        } else if (IS_DG1(dev_priv) || IS_ROCKETLAKE(dev_priv)) {
                intel_ddi_init(dev_priv, PORT_A);
                intel_ddi_init(dev_priv, PORT_B);
                intel_ddi_init(dev_priv, PORT_TC1);
                intel_ddi_init(dev_priv, PORT_TC2);
        } else if (DISPLAY_VER(dev_priv) >= 12) {
                intel_ddi_init(dev_priv, PORT_A);
                intel_ddi_init(dev_priv, PORT_B);
                intel_ddi_init(dev_priv, PORT_TC1);
                intel_ddi_init(dev_priv, PORT_TC2);
                intel_ddi_init(dev_priv, PORT_TC3);
                intel_ddi_init(dev_priv, PORT_TC4);
                intel_ddi_init(dev_priv, PORT_TC5);
                intel_ddi_init(dev_priv, PORT_TC6);
                icl_dsi_init(dev_priv);
        } else if (IS_JSL_EHL(dev_priv)) {
                intel_ddi_init(dev_priv, PORT_A);
                intel_ddi_init(dev_priv, PORT_B);
                intel_ddi_init(dev_priv, PORT_C);
                intel_ddi_init(dev_priv, PORT_D);
                icl_dsi_init(dev_priv);
        } else if (DISPLAY_VER(dev_priv) == 11) {
                intel_ddi_init(dev_priv, PORT_A);
                intel_ddi_init(dev_priv, PORT_B);
                intel_ddi_init(dev_priv, PORT_C);
                intel_ddi_init(dev_priv, PORT_D);
                intel_ddi_init(dev_priv, PORT_E);
                intel_ddi_init(dev_priv, PORT_F);
                icl_dsi_init(dev_priv);
        } else if (IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv)) {
                intel_ddi_init(dev_priv, PORT_A);
                intel_ddi_init(dev_priv, PORT_B);
                intel_ddi_init(dev_priv, PORT_C);
                vlv_dsi_init(dev_priv);
        } else if (DISPLAY_VER(dev_priv) >= 9) {
                intel_ddi_init(dev_priv, PORT_A);
                intel_ddi_init(dev_priv, PORT_B);
                intel_ddi_init(dev_priv, PORT_C);
                intel_ddi_init(dev_priv, PORT_D);
                intel_ddi_init(dev_priv, PORT_E);
        } else if (HAS_DDI(dev_priv)) {
                u32 found;

                if (intel_ddi_crt_present(dev_priv))
                        intel_crt_init(dev_priv);

                /* Haswell uses DDI functions to detect digital outputs. */
                found = intel_de_read(dev_priv, DDI_BUF_CTL(PORT_A)) & DDI_INIT_DISPLAY_DETECTED;
                if (found)
                        intel_ddi_init(dev_priv, PORT_A);

                found = intel_de_read(dev_priv, SFUSE_STRAP);
                if (found & SFUSE_STRAP_DDIB_DETECTED)
                        intel_ddi_init(dev_priv, PORT_B);
                if (found & SFUSE_STRAP_DDIC_DETECTED)
                        intel_ddi_init(dev_priv, PORT_C);
                if (found & SFUSE_STRAP_DDID_DETECTED)
                        intel_ddi_init(dev_priv, PORT_D);
                if (found & SFUSE_STRAP_DDIF_DETECTED)
                        intel_ddi_init(dev_priv, PORT_F);
        } else if (HAS_PCH_SPLIT(dev_priv)) {
                int found;

                /*
                 * intel_edp_init_connector() depends on this completing first,
                 * to prevent the registration of both eDP and LVDS and the
                 * incorrect sharing of the PPS.
                 */
                intel_lvds_init(dev_priv);
                intel_crt_init(dev_priv);

                dpd_is_edp = intel_dp_is_port_edp(dev_priv, PORT_D);

                if (ilk_has_edp_a(dev_priv))
                        g4x_dp_init(dev_priv, DP_A, PORT_A);

                if (intel_de_read(dev_priv, PCH_HDMIB) & SDVO_DETECTED) {
                        /* PCH SDVOB multiplex with HDMIB */
                        found = intel_sdvo_init(dev_priv, PCH_SDVOB, PORT_B);
                        if (!found)
                                g4x_hdmi_init(dev_priv, PCH_HDMIB, PORT_B);
                        if (!found && (intel_de_read(dev_priv, PCH_DP_B) & DP_DETECTED))
                                g4x_dp_init(dev_priv, PCH_DP_B, PORT_B);
                }

                if (intel_de_read(dev_priv, PCH_HDMIC) & SDVO_DETECTED)
                        g4x_hdmi_init(dev_priv, PCH_HDMIC, PORT_C);

                if (!dpd_is_edp && intel_de_read(dev_priv, PCH_HDMID) & SDVO_DETECTED)
                        g4x_hdmi_init(dev_priv, PCH_HDMID, PORT_D);

                if (intel_de_read(dev_priv, PCH_DP_C) & DP_DETECTED)
                        g4x_dp_init(dev_priv, PCH_DP_C, PORT_C);

                if (intel_de_read(dev_priv, PCH_DP_D) & DP_DETECTED)
                        g4x_dp_init(dev_priv, PCH_DP_D, PORT_D);
        } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
                bool has_edp, has_port;

                if (IS_VALLEYVIEW(dev_priv) && dev_priv->vbt.int_crt_support)
                        intel_crt_init(dev_priv);

                /*
                 * The DP_DETECTED bit is the latched state of the DDC
                 * SDA pin at boot. However since eDP doesn't require DDC
                 * (no way to plug in a DP->HDMI dongle) the DDC pins for
                 * eDP ports may have been muxed to an alternate function.
                 * Thus we can't rely on the DP_DETECTED bit alone to detect
                 * eDP ports. Consult the VBT as well as DP_DETECTED to
                 * detect eDP ports.
                 *
                 * Sadly the straps seem to be missing sometimes even for HDMI
                 * ports (eg. on Voyo V3 - CHT x7-Z8700), so check both strap
                 * and VBT for the presence of the port. Additionally we can't
                 * trust the port type the VBT declares as we've seen at least
                 * HDMI ports that the VBT claim are DP or eDP.
                 */
                has_edp = intel_dp_is_port_edp(dev_priv, PORT_B);
                has_port = intel_bios_is_port_present(dev_priv, PORT_B);
                if (intel_de_read(dev_priv, VLV_DP_B) & DP_DETECTED || has_port)
                        has_edp &= g4x_dp_init(dev_priv, VLV_DP_B, PORT_B);
                if ((intel_de_read(dev_priv, VLV_HDMIB) & SDVO_DETECTED || has_port) && !has_edp)
                        g4x_hdmi_init(dev_priv, VLV_HDMIB, PORT_B);

                has_edp = intel_dp_is_port_edp(dev_priv, PORT_C);
                has_port = intel_bios_is_port_present(dev_priv, PORT_C);
                if (intel_de_read(dev_priv, VLV_DP_C) & DP_DETECTED || has_port)
                        has_edp &= g4x_dp_init(dev_priv, VLV_DP_C, PORT_C);
                if ((intel_de_read(dev_priv, VLV_HDMIC) & SDVO_DETECTED || has_port) && !has_edp)
                        g4x_hdmi_init(dev_priv, VLV_HDMIC, PORT_C);

                if (IS_CHERRYVIEW(dev_priv)) {
                        /*
                         * eDP not supported on port D,
                         * so no need to worry about it
                         */
                        has_port = intel_bios_is_port_present(dev_priv, PORT_D);
                        if (intel_de_read(dev_priv, CHV_DP_D) & DP_DETECTED || has_port)
                                g4x_dp_init(dev_priv, CHV_DP_D, PORT_D);
                        if (intel_de_read(dev_priv, CHV_HDMID) & SDVO_DETECTED || has_port)
                                g4x_hdmi_init(dev_priv, CHV_HDMID, PORT_D);
                }

                vlv_dsi_init(dev_priv);
        } else if (IS_PINEVIEW(dev_priv)) {
                intel_lvds_init(dev_priv);
                intel_crt_init(dev_priv);
        } else if (IS_DISPLAY_VER(dev_priv, 3, 4)) {
                bool found = false;

                if (IS_MOBILE(dev_priv))
                        intel_lvds_init(dev_priv);

                intel_crt_init(dev_priv);

                if (intel_de_read(dev_priv, GEN3_SDVOB) & SDVO_DETECTED) {
                        drm_dbg_kms(&dev_priv->drm, "probing SDVOB\n");
                        found = intel_sdvo_init(dev_priv, GEN3_SDVOB, PORT_B);
                        if (!found && IS_G4X(dev_priv)) {
                                drm_dbg_kms(&dev_priv->drm,
                                            "probing HDMI on SDVOB\n");
                                g4x_hdmi_init(dev_priv, GEN4_HDMIB, PORT_B);
                        }

                        if (!found && IS_G4X(dev_priv))
                                g4x_dp_init(dev_priv, DP_B, PORT_B);
                }

                /* Before G4X SDVOC doesn't have its own detect register */

                if (intel_de_read(dev_priv, GEN3_SDVOB) & SDVO_DETECTED) {
                        drm_dbg_kms(&dev_priv->drm, "probing SDVOC\n");
                        found = intel_sdvo_init(dev_priv, GEN3_SDVOC, PORT_C);
                }

                if (!found && (intel_de_read(dev_priv, GEN3_SDVOC) & SDVO_DETECTED)) {

                        if (IS_G4X(dev_priv)) {
                                drm_dbg_kms(&dev_priv->drm,
                                            "probing HDMI on SDVOC\n");
                                g4x_hdmi_init(dev_priv, GEN4_HDMIC, PORT_C);
                        }
                        if (IS_G4X(dev_priv))
                                g4x_dp_init(dev_priv, DP_C, PORT_C);
                }

                if (IS_G4X(dev_priv) && (intel_de_read(dev_priv, DP_D) & DP_DETECTED))
                        g4x_dp_init(dev_priv, DP_D, PORT_D);

                if (SUPPORTS_TV(dev_priv))
                        intel_tv_init(dev_priv);
        } else if (DISPLAY_VER(dev_priv) == 2) {
                if (IS_I85X(dev_priv))
                        intel_lvds_init(dev_priv);

                intel_crt_init(dev_priv);
                intel_dvo_init(dev_priv);
        }

        for_each_intel_encoder(&dev_priv->drm, encoder) {
                encoder->base.possible_crtcs =
                        intel_encoder_possible_crtcs(encoder);
                encoder->base.possible_clones =
                        intel_encoder_possible_clones(encoder);
        }

        intel_init_pch_refclk(dev_priv);

        drm_helper_move_panel_connectors_to_head(&dev_priv->drm);
}

static enum drm_mode_status
intel_mode_valid(struct drm_device *dev,
                 const struct drm_display_mode *mode)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        int hdisplay_max, htotal_max;
        int vdisplay_max, vtotal_max;

        /*
         * Can't reject DBLSCAN here because Xorg ddxen can add piles
         * of DBLSCAN modes to the output's mode list when they detect
         * the scaling mode property on the connector. And they don't
         * ask the kernel to validate those modes in any way until
         * modeset time at which point the client gets a protocol error.
         * So in order to not upset those clients we silently ignore the
         * DBLSCAN flag on such connectors. For other connectors we will
         * reject modes with the DBLSCAN flag in encoder->compute_config().
         * And we always reject DBLSCAN modes in connector->mode_valid()
         * as we never want such modes on the connector's mode list.
         */

        if (mode->vscan > 1)
                return MODE_NO_VSCAN;

        if (mode->flags & DRM_MODE_FLAG_HSKEW)
                return MODE_H_ILLEGAL;

        if (mode->flags & (DRM_MODE_FLAG_CSYNC |
                           DRM_MODE_FLAG_NCSYNC |
                           DRM_MODE_FLAG_PCSYNC))
                return MODE_HSYNC;

        if (mode->flags & (DRM_MODE_FLAG_BCAST |
                           DRM_MODE_FLAG_PIXMUX |
                           DRM_MODE_FLAG_CLKDIV2))
                return MODE_BAD;

        /* Transcoder timing limits */
        if (DISPLAY_VER(dev_priv) >= 11) {
                hdisplay_max = 16384;
                vdisplay_max = 8192;
                htotal_max = 16384;
                vtotal_max = 8192;
        } else if (DISPLAY_VER(dev_priv) >= 9 ||
                   IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv)) {
                hdisplay_max = 8192; /* FDI max 4096 handled elsewhere */
                vdisplay_max = 4096;
                htotal_max = 8192;
                vtotal_max = 8192;
        } else if (DISPLAY_VER(dev_priv) >= 3) {
                hdisplay_max = 4096;
                vdisplay_max = 4096;
                htotal_max = 8192;
                vtotal_max = 8192;
        } else {
                hdisplay_max = 2048;
                vdisplay_max = 2048;
                htotal_max = 4096;
                vtotal_max = 4096;
        }

        if (mode->hdisplay > hdisplay_max ||
            mode->hsync_start > htotal_max ||
            mode->hsync_end > htotal_max ||
            mode->htotal > htotal_max)
                return MODE_H_ILLEGAL;

        if (mode->vdisplay > vdisplay_max ||
            mode->vsync_start > vtotal_max ||
            mode->vsync_end > vtotal_max ||
            mode->vtotal > vtotal_max)
                return MODE_V_ILLEGAL;

        if (DISPLAY_VER(dev_priv) >= 5) {
                if (mode->hdisplay < 64 ||
                    mode->htotal - mode->hdisplay < 32)
                        return MODE_H_ILLEGAL;

                if (mode->vtotal - mode->vdisplay < 5)
                        return MODE_V_ILLEGAL;
        } else {
                if (mode->htotal - mode->hdisplay < 32)
                        return MODE_H_ILLEGAL;

                if (mode->vtotal - mode->vdisplay < 3)
                        return MODE_V_ILLEGAL;
        }

        return MODE_OK;
}

enum drm_mode_status
intel_mode_valid_max_plane_size(struct drm_i915_private *dev_priv,
                                const struct drm_display_mode *mode,
                                bool bigjoiner)
{
        int plane_width_max, plane_height_max;

        /*
         * intel_mode_valid() should be
         * sufficient on older platforms.
         */
        if (DISPLAY_VER(dev_priv) < 9)
                return MODE_OK;

        /*
         * Most people will probably want a fullscreen
         * plane so let's not advertize modes that are
         * too big for that.
         */
        if (DISPLAY_VER(dev_priv) >= 11) {
                plane_width_max = 5120 << bigjoiner;
                plane_height_max = 4320;
        } else {
                plane_width_max = 5120;
                plane_height_max = 4096;
        }

        if (mode->hdisplay > plane_width_max)
                return MODE_H_ILLEGAL;

        if (mode->vdisplay > plane_height_max)
                return MODE_V_ILLEGAL;

        return MODE_OK;
}

static const struct drm_mode_config_funcs intel_mode_funcs = {
        .fb_create = intel_user_framebuffer_create,
        .get_format_info = intel_get_format_info,
        .output_poll_changed = intel_fbdev_output_poll_changed,
        .mode_valid = intel_mode_valid,
        .atomic_check = intel_atomic_check,
        .atomic_commit = intel_atomic_commit,
        .atomic_state_alloc = intel_atomic_state_alloc,
        .atomic_state_clear = intel_atomic_state_clear,
        .atomic_state_free = intel_atomic_state_free,
};

/**
 * intel_init_display_hooks - initialize the display modesetting hooks
 * @dev_priv: device private
 */
void intel_init_display_hooks(struct drm_i915_private *dev_priv)
{
        if (!HAS_DISPLAY(dev_priv))
                return;

        intel_init_cdclk_hooks(dev_priv);
        intel_init_audio_hooks(dev_priv);

        intel_dpll_init_clock_hook(dev_priv);

        if (DISPLAY_VER(dev_priv) >= 9) {
                dev_priv->display.get_pipe_config = hsw_get_pipe_config;
                dev_priv->display.crtc_enable = hsw_crtc_enable;
                dev_priv->display.crtc_disable = hsw_crtc_disable;
        } else if (HAS_DDI(dev_priv)) {
                dev_priv->display.get_pipe_config = hsw_get_pipe_config;
                dev_priv->display.crtc_enable = hsw_crtc_enable;
                dev_priv->display.crtc_disable = hsw_crtc_disable;
        } else if (HAS_PCH_SPLIT(dev_priv)) {
                dev_priv->display.get_pipe_config = ilk_get_pipe_config;
                dev_priv->display.crtc_enable = ilk_crtc_enable;
                dev_priv->display.crtc_disable = ilk_crtc_disable;
        } else if (IS_CHERRYVIEW(dev_priv) ||
                   IS_VALLEYVIEW(dev_priv)) {
                dev_priv->display.get_pipe_config = i9xx_get_pipe_config;
                dev_priv->display.crtc_enable = valleyview_crtc_enable;
                dev_priv->display.crtc_disable = i9xx_crtc_disable;
        } else {
                dev_priv->display.get_pipe_config = i9xx_get_pipe_config;
                dev_priv->display.crtc_enable = i9xx_crtc_enable;
                dev_priv->display.crtc_disable = i9xx_crtc_disable;
        }

        intel_fdi_init_hook(dev_priv);

        if (DISPLAY_VER(dev_priv) >= 9) {
                dev_priv->display.commit_modeset_enables = skl_commit_modeset_enables;
                dev_priv->display.get_initial_plane_config = skl_get_initial_plane_config;
        } else {
                dev_priv->display.commit_modeset_enables = intel_commit_modeset_enables;
                dev_priv->display.get_initial_plane_config = i9xx_get_initial_plane_config;
        }

}

void intel_modeset_init_hw(struct drm_i915_private *i915)
{
        struct intel_cdclk_state *cdclk_state;

        if (!HAS_DISPLAY(i915))
                return;

        cdclk_state = to_intel_cdclk_state(i915->cdclk.obj.state);

        intel_update_cdclk(i915);
        intel_dump_cdclk_config(&i915->cdclk.hw, "Current CDCLK");
        cdclk_state->logical = cdclk_state->actual = i915->cdclk.hw;
}

static int sanitize_watermarks_add_affected(struct drm_atomic_state *state)
{
        struct drm_plane *plane;
        struct intel_crtc *crtc;

        for_each_intel_crtc(state->dev, crtc) {
                struct intel_crtc_state *crtc_state;

                crtc_state = intel_atomic_get_crtc_state(state, crtc);
                if (IS_ERR(crtc_state))
                        return PTR_ERR(crtc_state);

                if (crtc_state->hw.active) {
                        /*
                         * Preserve the inherited flag to avoid
                         * taking the full modeset path.
                         */
                        crtc_state->inherited = true;
                }
        }

        drm_for_each_plane(plane, state->dev) {
                struct drm_plane_state *plane_state;

                plane_state = drm_atomic_get_plane_state(state, plane);
                if (IS_ERR(plane_state))
                        return PTR_ERR(plane_state);
        }

        return 0;
}

/*
 * Calculate what we think the watermarks should be for the state we've read
 * out of the hardware and then immediately program those watermarks so that
 * we ensure the hardware settings match our internal state.
 *
 * We can calculate what we think WM's should be by creating a duplicate of the
 * current state (which was constructed during hardware readout) and running it
 * through the atomic check code to calculate new watermark values in the
 * state object.
 */
static void sanitize_watermarks(struct drm_i915_private *dev_priv)
{
        struct drm_atomic_state *state;
        struct intel_atomic_state *intel_state;
        struct intel_crtc *crtc;
        struct intel_crtc_state *crtc_state;
        struct drm_modeset_acquire_ctx ctx;
        int ret;
        int i;

        /* Only supported on platforms that use atomic watermark design */
        if (!dev_priv->display.optimize_watermarks)
                return;

        state = drm_atomic_state_alloc(&dev_priv->drm);
        if (drm_WARN_ON(&dev_priv->drm, !state))
                return;

        intel_state = to_intel_atomic_state(state);

        drm_modeset_acquire_init(&ctx, 0);

retry:
        state->acquire_ctx = &ctx;

        /*
         * Hardware readout is the only time we don't want to calculate
         * intermediate watermarks (since we don't trust the current
         * watermarks).
         */
        if (!HAS_GMCH(dev_priv))
                intel_state->skip_intermediate_wm = true;

        ret = sanitize_watermarks_add_affected(state);
        if (ret)
                goto fail;

        ret = intel_atomic_check(&dev_priv->drm, state);
        if (ret)
                goto fail;

        /* Write calculated watermark values back */
        for_each_new_intel_crtc_in_state(intel_state, crtc, crtc_state, i) {
                crtc_state->wm.need_postvbl_update = true;
                dev_priv->display.optimize_watermarks(intel_state, crtc);

                to_intel_crtc_state(crtc->base.state)->wm = crtc_state->wm;
        }

fail:
        if (ret == -EDEADLK) {
                drm_atomic_state_clear(state);
                drm_modeset_backoff(&ctx);
                goto retry;
        }

        /*
         * If we fail here, it means that the hardware appears to be
         * programmed in a way that shouldn't be possible, given our
         * understanding of watermark requirements.  This might mean a
         * mistake in the hardware readout code or a mistake in the
         * watermark calculations for a given platform.  Raise a WARN
         * so that this is noticeable.
         *
         * If this actually happens, we'll have to just leave the
         * BIOS-programmed watermarks untouched and hope for the best.
         */
        drm_WARN(&dev_priv->drm, ret,
                 "Could not determine valid watermarks for inherited state\n");

        drm_atomic_state_put(state);

        drm_modeset_drop_locks(&ctx);
        drm_modeset_acquire_fini(&ctx);
}

static int intel_initial_commit(struct drm_device *dev)
{
        struct drm_atomic_state *state = NULL;
        struct drm_modeset_acquire_ctx ctx;
        struct intel_crtc *crtc;
        int ret = 0;

        state = drm_atomic_state_alloc(dev);
        if (!state)
                return -ENOMEM;

        drm_modeset_acquire_init(&ctx, 0);

retry:
        state->acquire_ctx = &ctx;

        for_each_intel_crtc(dev, crtc) {
                struct intel_crtc_state *crtc_state =
                        intel_atomic_get_crtc_state(state, crtc);

                if (IS_ERR(crtc_state)) {
                        ret = PTR_ERR(crtc_state);
                        goto out;
                }

                if (crtc_state->hw.active) {
                        struct intel_encoder *encoder;

                        /*
                         * We've not yet detected sink capabilities
                         * (audio,infoframes,etc.) and thus we don't want to
                         * force a full state recomputation yet. We want that to
                         * happen only for the first real commit from userspace.
                         * So preserve the inherited flag for the time being.
                         */
                        crtc_state->inherited = true;

                        ret = drm_atomic_add_affected_planes(state, &crtc->base);
                        if (ret)
                                goto out;

                        /*
                         * FIXME hack to force a LUT update to avoid the
                         * plane update forcing the pipe gamma on without
                         * having a proper LUT loaded. Remove once we
                         * have readout for pipe gamma enable.
                         */
                        crtc_state->uapi.color_mgmt_changed = true;

                        for_each_intel_encoder_mask(dev, encoder,
                                                    crtc_state->uapi.encoder_mask) {
                                if (encoder->initial_fastset_check &&
                                    !encoder->initial_fastset_check(encoder, crtc_state)) {
                                        ret = drm_atomic_add_affected_connectors(state,
                                                                                 &crtc->base);
                                        if (ret)
                                                goto out;
                                }
                        }
                }
        }

        ret = drm_atomic_commit(state);

out:
        if (ret == -EDEADLK) {
                drm_atomic_state_clear(state);
                drm_modeset_backoff(&ctx);
                goto retry;
        }

        drm_atomic_state_put(state);

        drm_modeset_drop_locks(&ctx);
        drm_modeset_acquire_fini(&ctx);

        return ret;
}

static void intel_mode_config_init(struct drm_i915_private *i915)
{
        struct drm_mode_config *mode_config = &i915->drm.mode_config;

        drm_mode_config_init(&i915->drm);
        INIT_LIST_HEAD(&i915->global_obj_list);

        mode_config->min_width = 0;
        mode_config->min_height = 0;

        mode_config->preferred_depth = 24;
        mode_config->prefer_shadow = 1;

        mode_config->funcs = &intel_mode_funcs;

        mode_config->async_page_flip = HAS_ASYNC_FLIPS(i915);

        /*
         * Maximum framebuffer dimensions, chosen to match
         * the maximum render engine surface size on gen4+.
         */
        if (DISPLAY_VER(i915) >= 7) {
                mode_config->max_width = 16384;
                mode_config->max_height = 16384;
        } else if (DISPLAY_VER(i915) >= 4) {
                mode_config->max_width = 8192;
                mode_config->max_height = 8192;
        } else if (DISPLAY_VER(i915) == 3) {
                mode_config->max_width = 4096;
                mode_config->max_height = 4096;
        } else {
                mode_config->max_width = 2048;
                mode_config->max_height = 2048;
        }

        if (IS_I845G(i915) || IS_I865G(i915)) {
                mode_config->cursor_width = IS_I845G(i915) ? 64 : 512;
                mode_config->cursor_height = 1023;
        } else if (IS_I830(i915) || IS_I85X(i915) ||
                   IS_I915G(i915) || IS_I915GM(i915)) {
                mode_config->cursor_width = 64;
                mode_config->cursor_height = 64;
        } else {
                mode_config->cursor_width = 256;
                mode_config->cursor_height = 256;
        }
}

static void intel_mode_config_cleanup(struct drm_i915_private *i915)
{
        intel_atomic_global_obj_cleanup(i915);
        drm_mode_config_cleanup(&i915->drm);
}

static void plane_config_fini(struct intel_initial_plane_config *plane_config)
{
        if (plane_config->fb) {
                struct drm_framebuffer *fb = &plane_config->fb->base;

                /* We may only have the stub and not a full framebuffer */
                if (drm_framebuffer_read_refcount(fb))
                        drm_framebuffer_put(fb);
                else
                        kfree(fb);
        }

        if (plane_config->vma)
                i915_vma_put(plane_config->vma);
}

/* part #1: call before irq install */
int intel_modeset_init_noirq(struct drm_i915_private *i915)
{
        int ret;

        if (i915_inject_probe_failure(i915))
                return -ENODEV;

        if (HAS_DISPLAY(i915)) {
                ret = drm_vblank_init(&i915->drm,
                                      INTEL_NUM_PIPES(i915));
                if (ret)
                        return ret;
        }

        intel_bios_init(i915);

        ret = intel_vga_register(i915);
        if (ret)
                goto cleanup_bios;

        /* FIXME: completely on the wrong abstraction layer */
        intel_power_domains_init_hw(i915, false);

        if (!HAS_DISPLAY(i915))
                return 0;

        intel_dmc_ucode_init(i915);

        i915->modeset_wq = alloc_ordered_workqueue("i915_modeset", 0);
        i915->flip_wq = alloc_workqueue("i915_flip", WQ_HIGHPRI |
                                        WQ_UNBOUND, WQ_UNBOUND_MAX_ACTIVE);

        i915->framestart_delay = 1; /* 1-4 */

        i915->window2_delay = 0; /* No DSB so no window2 delay */

        intel_mode_config_init(i915);

        ret = intel_cdclk_init(i915);
        if (ret)
                goto cleanup_vga_client_pw_domain_dmc;

        ret = intel_dbuf_init(i915);
        if (ret)
                goto cleanup_vga_client_pw_domain_dmc;

        ret = intel_bw_init(i915);
        if (ret)
                goto cleanup_vga_client_pw_domain_dmc;

        init_llist_head(&i915->atomic_helper.free_list);
        INIT_WORK(&i915->atomic_helper.free_work,
                  intel_atomic_helper_free_state_worker);

        intel_init_quirks(i915);

        intel_fbc_init(i915);

        return 0;

cleanup_vga_client_pw_domain_dmc:
        intel_dmc_ucode_fini(i915);
        intel_power_domains_driver_remove(i915);
        intel_vga_unregister(i915);
cleanup_bios:
        intel_bios_driver_remove(i915);

        return ret;
}

/* part #2: call after irq install, but before gem init */
int intel_modeset_init_nogem(struct drm_i915_private *i915)
{
        struct drm_device *dev = &i915->drm;
        enum pipe pipe;
        struct intel_crtc *crtc;
        int ret;

        if (!HAS_DISPLAY(i915))
                return 0;

        intel_init_pm(i915);

        intel_panel_sanitize_ssc(i915);

        intel_pps_setup(i915);

        intel_gmbus_setup(i915);

        drm_dbg_kms(&i915->drm, "%d display pipe%s available.\n",
                    INTEL_NUM_PIPES(i915),
                    INTEL_NUM_PIPES(i915) > 1 ? "s" : "");

        for_each_pipe(i915, pipe) {
                ret = intel_crtc_init(i915, pipe);
                if (ret) {
                        intel_mode_config_cleanup(i915);
                        return ret;
                }
        }

        intel_plane_possible_crtcs_init(i915);
        intel_shared_dpll_init(dev);
        intel_fdi_pll_freq_update(i915);

        intel_update_czclk(i915);
        intel_modeset_init_hw(i915);
        intel_dpll_update_ref_clks(i915);

        intel_hdcp_component_init(i915);

        if (i915->max_cdclk_freq == 0)
                intel_update_max_cdclk(i915);

        /*
         * If the platform has HTI, we need to find out whether it has reserved
         * any display resources before we create our display outputs.
         */
        if (INTEL_INFO(i915)->display.has_hti)
                i915->hti_state = intel_de_read(i915, HDPORT_STATE);

        /* Just disable it once at startup */
        intel_vga_disable(i915);
        intel_setup_outputs(i915);

        drm_modeset_lock_all(dev);
        intel_modeset_setup_hw_state(dev, dev->mode_config.acquire_ctx);
        drm_modeset_unlock_all(dev);

        for_each_intel_crtc(dev, crtc) {
                struct intel_initial_plane_config plane_config = {};

                if (!to_intel_crtc_state(crtc->base.state)->uapi.active)
                        continue;

                /*
                 * Note that reserving the BIOS fb up front prevents us
                 * from stuffing other stolen allocations like the ring
                 * on top.  This prevents some ugliness at boot time, and
                 * can even allow for smooth boot transitions if the BIOS
                 * fb is large enough for the active pipe configuration.
                 */
                i915->display.get_initial_plane_config(crtc, &plane_config);

                /*
                 * If the fb is shared between multiple heads, we'll
                 * just get the first one.
                 */
                intel_find_initial_plane_obj(crtc, &plane_config);

                plane_config_fini(&plane_config);
        }

        /*
         * Make sure hardware watermarks really match the state we read out.
         * Note that we need to do this after reconstructing the BIOS fb's
         * since the watermark calculation done here will use pstate->fb.
         */
        if (!HAS_GMCH(i915))
                sanitize_watermarks(i915);

        return 0;
}

/* part #3: call after gem init */
int intel_modeset_init(struct drm_i915_private *i915)
{
        int ret;

        if (!HAS_DISPLAY(i915))
                return 0;

        /*
         * Force all active planes to recompute their states. So that on
         * mode_setcrtc after probe, all the intel_plane_state variables
         * are already calculated and there is no assert_plane warnings
         * during bootup.
         */
        ret = intel_initial_commit(&i915->drm);
        if (ret)
                drm_dbg_kms(&i915->drm, "Initial modeset failed, %d\n", ret);

        intel_overlay_setup(i915);

        ret = intel_fbdev_init(&i915->drm);
        if (ret)
                return ret;

        /* Only enable hotplug handling once the fbdev is fully set up. */
        intel_hpd_init(i915);
        intel_hpd_poll_disable(i915);

        intel_init_ipc(i915);

        return 0;
}

void i830_enable_pipe(struct drm_i915_private *dev_priv, enum pipe pipe)
{
        struct intel_crtc *crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
        /* 640x480@60Hz, ~25175 kHz */
        struct dpll clock = {
                .m1 = 18,
                .m2 = 7,
                .p1 = 13,
                .p2 = 4,
                .n = 2,
        };
        u32 dpll, fp;
        int i;

        drm_WARN_ON(&dev_priv->drm,
                    i9xx_calc_dpll_params(48000, &clock) != 25154);

        drm_dbg_kms(&dev_priv->drm,
                    "enabling pipe %c due to force quirk (vco=%d dot=%d)\n",
                    pipe_name(pipe), clock.vco, clock.dot);

        fp = i9xx_dpll_compute_fp(&clock);
        dpll = DPLL_DVO_2X_MODE |
                DPLL_VGA_MODE_DIS |
                ((clock.p1 - 2) << DPLL_FPA01_P1_POST_DIV_SHIFT) |
                PLL_P2_DIVIDE_BY_4 |
                PLL_REF_INPUT_DREFCLK |
                DPLL_VCO_ENABLE;

        intel_de_write(dev_priv, FP0(pipe), fp);
        intel_de_write(dev_priv, FP1(pipe), fp);

        intel_de_write(dev_priv, HTOTAL(pipe), (640 - 1) | ((800 - 1) << 16));
        intel_de_write(dev_priv, HBLANK(pipe), (640 - 1) | ((800 - 1) << 16));
        intel_de_write(dev_priv, HSYNC(pipe), (656 - 1) | ((752 - 1) << 16));
        intel_de_write(dev_priv, VTOTAL(pipe), (480 - 1) | ((525 - 1) << 16));
        intel_de_write(dev_priv, VBLANK(pipe), (480 - 1) | ((525 - 1) << 16));
        intel_de_write(dev_priv, VSYNC(pipe), (490 - 1) | ((492 - 1) << 16));
        intel_de_write(dev_priv, PIPESRC(pipe), ((640 - 1) << 16) | (480 - 1));

        /*
         * Apparently we need to have VGA mode enabled prior to changing
         * the P1/P2 dividers. Otherwise the DPLL will keep using the old
         * dividers, even though the register value does change.
         */
        intel_de_write(dev_priv, DPLL(pipe), dpll & ~DPLL_VGA_MODE_DIS);
        intel_de_write(dev_priv, DPLL(pipe), dpll);

        /* Wait for the clocks to stabilize. */
        intel_de_posting_read(dev_priv, DPLL(pipe));
        udelay(150);

        /* The pixel multiplier can only be updated once the
         * DPLL is enabled and the clocks are stable.
         *
         * So write it again.
         */
        intel_de_write(dev_priv, DPLL(pipe), dpll);

        /* We do this three times for luck */
        for (i = 0; i < 3 ; i++) {
                intel_de_write(dev_priv, DPLL(pipe), dpll);
                intel_de_posting_read(dev_priv, DPLL(pipe));
                udelay(150); /* wait for warmup */
        }

        intel_de_write(dev_priv, PIPECONF(pipe),
                       PIPECONF_ENABLE | PIPECONF_PROGRESSIVE);
        intel_de_posting_read(dev_priv, PIPECONF(pipe));

        intel_wait_for_pipe_scanline_moving(crtc);
}

void i830_disable_pipe(struct drm_i915_private *dev_priv, enum pipe pipe)
{
        struct intel_crtc *crtc = intel_get_crtc_for_pipe(dev_priv, pipe);

        drm_dbg_kms(&dev_priv->drm, "disabling pipe %c due to force quirk\n",
                    pipe_name(pipe));

        drm_WARN_ON(&dev_priv->drm,
                    intel_de_read(dev_priv, DSPCNTR(PLANE_A)) &
                    DISPLAY_PLANE_ENABLE);
        drm_WARN_ON(&dev_priv->drm,
                    intel_de_read(dev_priv, DSPCNTR(PLANE_B)) &
                    DISPLAY_PLANE_ENABLE);
        drm_WARN_ON(&dev_priv->drm,
                    intel_de_read(dev_priv, DSPCNTR(PLANE_C)) &
                    DISPLAY_PLANE_ENABLE);
        drm_WARN_ON(&dev_priv->drm,
                    intel_de_read(dev_priv, CURCNTR(PIPE_A)) & MCURSOR_MODE);
        drm_WARN_ON(&dev_priv->drm,
                    intel_de_read(dev_priv, CURCNTR(PIPE_B)) & MCURSOR_MODE);

        intel_de_write(dev_priv, PIPECONF(pipe), 0);
        intel_de_posting_read(dev_priv, PIPECONF(pipe));

        intel_wait_for_pipe_scanline_stopped(crtc);

        intel_de_write(dev_priv, DPLL(pipe), DPLL_VGA_MODE_DIS);
        intel_de_posting_read(dev_priv, DPLL(pipe));
}

static void
intel_sanitize_plane_mapping(struct drm_i915_private *dev_priv)
{
        struct intel_crtc *crtc;

        if (DISPLAY_VER(dev_priv) >= 4)
                return;

        for_each_intel_crtc(&dev_priv->drm, crtc) {
                struct intel_plane *plane =
                        to_intel_plane(crtc->base.primary);
                struct intel_crtc *plane_crtc;
                enum pipe pipe;

                if (!plane->get_hw_state(plane, &pipe))
                        continue;

                if (pipe == crtc->pipe)
                        continue;

                drm_dbg_kms(&dev_priv->drm,
                            "[PLANE:%d:%s] attached to the wrong pipe, disabling plane\n",
                            plane->base.base.id, plane->base.name);

                plane_crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
                intel_plane_disable_noatomic(plane_crtc, plane);
        }
}

static bool intel_crtc_has_encoders(struct intel_crtc *crtc)
{
        struct drm_device *dev = crtc->base.dev;
        struct intel_encoder *encoder;

        for_each_encoder_on_crtc(dev, &crtc->base, encoder)
                return true;

        return false;
}

static struct intel_connector *intel_encoder_find_connector(struct intel_encoder *encoder)
{
        struct drm_device *dev = encoder->base.dev;
        struct intel_connector *connector;

        for_each_connector_on_encoder(dev, &encoder->base, connector)
                return connector;

        return NULL;
}

static bool has_pch_trancoder(struct drm_i915_private *dev_priv,
                              enum pipe pch_transcoder)
{
        return HAS_PCH_IBX(dev_priv) || HAS_PCH_CPT(dev_priv) ||
                (HAS_PCH_LPT_H(dev_priv) && pch_transcoder == PIPE_A);
}

static void intel_sanitize_frame_start_delay(const struct intel_crtc_state *crtc_state)
{
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
        enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;

        if (DISPLAY_VER(dev_priv) >= 9 ||
            IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv)) {
                i915_reg_t reg = CHICKEN_TRANS(cpu_transcoder);
                u32 val;

                if (transcoder_is_dsi(cpu_transcoder))
                        return;

                val = intel_de_read(dev_priv, reg);
                val &= ~HSW_FRAME_START_DELAY_MASK;
                val |= HSW_FRAME_START_DELAY(dev_priv->framestart_delay - 1);
                intel_de_write(dev_priv, reg, val);
        } else {
                i915_reg_t reg = PIPECONF(cpu_transcoder);
                u32 val;

                val = intel_de_read(dev_priv, reg);
                val &= ~PIPECONF_FRAME_START_DELAY_MASK;
                val |= PIPECONF_FRAME_START_DELAY(dev_priv->framestart_delay - 1);
                intel_de_write(dev_priv, reg, val);
        }

        if (!crtc_state->has_pch_encoder)
                return;

        if (HAS_PCH_IBX(dev_priv)) {
                i915_reg_t reg = PCH_TRANSCONF(crtc->pipe);
                u32 val;

                val = intel_de_read(dev_priv, reg);
                val &= ~TRANS_FRAME_START_DELAY_MASK;
                val |= TRANS_FRAME_START_DELAY(dev_priv->framestart_delay - 1);
                intel_de_write(dev_priv, reg, val);
        } else {
                enum pipe pch_transcoder = intel_crtc_pch_transcoder(crtc);
                i915_reg_t reg = TRANS_CHICKEN2(pch_transcoder);
                u32 val;

                val = intel_de_read(dev_priv, reg);
                val &= ~TRANS_CHICKEN2_FRAME_START_DELAY_MASK;
                val |= TRANS_CHICKEN2_FRAME_START_DELAY(dev_priv->framestart_delay - 1);
                intel_de_write(dev_priv, reg, val);
        }
}

static void intel_sanitize_crtc(struct intel_crtc *crtc,
                                struct drm_modeset_acquire_ctx *ctx)
{
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_crtc_state *crtc_state = to_intel_crtc_state(crtc->base.state);

        if (crtc_state->hw.active) {
                struct intel_plane *plane;

                /* Clear any frame start delays used for debugging left by the BIOS */
                intel_sanitize_frame_start_delay(crtc_state);

                /* Disable everything but the primary plane */
                for_each_intel_plane_on_crtc(dev, crtc, plane) {
                        const struct intel_plane_state *plane_state =
                                to_intel_plane_state(plane->base.state);

                        if (plane_state->uapi.visible &&
                            plane->base.type != DRM_PLANE_TYPE_PRIMARY)
                                intel_plane_disable_noatomic(crtc, plane);
                }

                /*
                 * Disable any background color set by the BIOS, but enable the
                 * gamma and CSC to match how we program our planes.
                 */
                if (DISPLAY_VER(dev_priv) >= 9)
                        intel_de_write(dev_priv, SKL_BOTTOM_COLOR(crtc->pipe),
                                       SKL_BOTTOM_COLOR_GAMMA_ENABLE | SKL_BOTTOM_COLOR_CSC_ENABLE);
        }

        /* Adjust the state of the output pipe according to whether we
         * have active connectors/encoders. */
        if (crtc_state->hw.active && !intel_crtc_has_encoders(crtc) &&
            !crtc_state->bigjoiner_slave)
                intel_crtc_disable_noatomic(crtc, ctx);

        if (crtc_state->hw.active || HAS_GMCH(dev_priv)) {
                /*
                 * We start out with underrun reporting disabled to avoid races.
                 * For correct bookkeeping mark this on active crtcs.
                 *
                 * Also on gmch platforms we dont have any hardware bits to
                 * disable the underrun reporting. Which means we need to start
                 * out with underrun reporting disabled also on inactive pipes,
                 * since otherwise we'll complain about the garbage we read when
                 * e.g. coming up after runtime pm.
                 *
                 * No protection against concurrent access is required - at
                 * worst a fifo underrun happens which also sets this to false.
                 */
                crtc->cpu_fifo_underrun_disabled = true;
                /*
                 * We track the PCH trancoder underrun reporting state
                 * within the crtc. With crtc for pipe A housing the underrun
                 * reporting state for PCH transcoder A, crtc for pipe B housing
                 * it for PCH transcoder B, etc. LPT-H has only PCH transcoder A,
                 * and marking underrun reporting as disabled for the non-existing
                 * PCH transcoders B and C would prevent enabling the south
                 * error interrupt (see cpt_can_enable_serr_int()).
                 */
                if (has_pch_trancoder(dev_priv, crtc->pipe))
                        crtc->pch_fifo_underrun_disabled = true;
        }
}

static bool has_bogus_dpll_config(const struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);

        /*
         * Some SNB BIOSen (eg. ASUS K53SV) are known to misprogram
         * the hardware when a high res displays plugged in. DPLL P
         * divider is zero, and the pipe timings are bonkers. We'll
         * try to disable everything in that case.
         *
         * FIXME would be nice to be able to sanitize this state
         * without several WARNs, but for now let's take the easy
         * road.
         */
        return IS_SANDYBRIDGE(dev_priv) &&
                crtc_state->hw.active &&
                crtc_state->shared_dpll &&
                crtc_state->port_clock == 0;
}

static void intel_sanitize_encoder(struct intel_encoder *encoder)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_connector *connector;
        struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
        struct intel_crtc_state *crtc_state = crtc ?
                to_intel_crtc_state(crtc->base.state) : NULL;

        /* We need to check both for a crtc link (meaning that the
         * encoder is active and trying to read from a pipe) and the
         * pipe itself being active. */
        bool has_active_crtc = crtc_state &&
                crtc_state->hw.active;

        if (crtc_state && has_bogus_dpll_config(crtc_state)) {
                drm_dbg_kms(&dev_priv->drm,
                            "BIOS has misprogrammed the hardware. Disabling pipe %c\n",
                            pipe_name(crtc->pipe));
                has_active_crtc = false;
        }

        connector = intel_encoder_find_connector(encoder);
        if (connector && !has_active_crtc) {
                drm_dbg_kms(&dev_priv->drm,
                            "[ENCODER:%d:%s] has active connectors but no active pipe!\n",
                            encoder->base.base.id,
                            encoder->base.name);

                /* Connector is active, but has no active pipe. This is
                 * fallout from our resume register restoring. Disable
                 * the encoder manually again. */
                if (crtc_state) {
                        struct drm_encoder *best_encoder;

                        drm_dbg_kms(&dev_priv->drm,
                                    "[ENCODER:%d:%s] manually disabled\n",
                                    encoder->base.base.id,
                                    encoder->base.name);

                        /* avoid oopsing in case the hooks consult best_encoder */
                        best_encoder = connector->base.state->best_encoder;
                        connector->base.state->best_encoder = &encoder->base;

                        /* FIXME NULL atomic state passed! */
                        if (encoder->disable)
                                encoder->disable(NULL, encoder, crtc_state,
                                                 connector->base.state);
                        if (encoder->post_disable)
                                encoder->post_disable(NULL, encoder, crtc_state,
                                                      connector->base.state);

                        connector->base.state->best_encoder = best_encoder;
                }
                encoder->base.crtc = NULL;

                /* Inconsistent output/port/pipe state happens presumably due to
                 * a bug in one of the get_hw_state functions. Or someplace else
                 * in our code, like the register restore mess on resume. Clamp
                 * things to off as a safer default. */

                connector->base.dpms = DRM_MODE_DPMS_OFF;
                connector->base.encoder = NULL;
        }

        /* notify opregion of the sanitized encoder state */
        intel_opregion_notify_encoder(encoder, connector && has_active_crtc);

        if (HAS_DDI(dev_priv))
                intel_ddi_sanitize_encoder_pll_mapping(encoder);
}

/* FIXME read out full plane state for all planes */
static void readout_plane_state(struct drm_i915_private *dev_priv)
{
        struct intel_plane *plane;
        struct intel_crtc *crtc;

        for_each_intel_plane(&dev_priv->drm, plane) {
                struct intel_plane_state *plane_state =
                        to_intel_plane_state(plane->base.state);
                struct intel_crtc_state *crtc_state;
                enum pipe pipe = PIPE_A;
                bool visible;

                visible = plane->get_hw_state(plane, &pipe);

                crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
                crtc_state = to_intel_crtc_state(crtc->base.state);

                intel_set_plane_visible(crtc_state, plane_state, visible);

                drm_dbg_kms(&dev_priv->drm,
                            "[PLANE:%d:%s] hw state readout: %s, pipe %c\n",
                            plane->base.base.id, plane->base.name,
                            enableddisabled(visible), pipe_name(pipe));
        }

        for_each_intel_crtc(&dev_priv->drm, crtc) {
                struct intel_crtc_state *crtc_state =
                        to_intel_crtc_state(crtc->base.state);

                fixup_plane_bitmasks(crtc_state);
        }
}

static void intel_modeset_readout_hw_state(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_cdclk_state *cdclk_state =
                to_intel_cdclk_state(dev_priv->cdclk.obj.state);
        struct intel_dbuf_state *dbuf_state =
                to_intel_dbuf_state(dev_priv->dbuf.obj.state);
        enum pipe pipe;
        struct intel_crtc *crtc;
        struct intel_encoder *encoder;
        struct intel_connector *connector;
        struct drm_connector_list_iter conn_iter;
        u8 active_pipes = 0;

        for_each_intel_crtc(dev, crtc) {
                struct intel_crtc_state *crtc_state =
                        to_intel_crtc_state(crtc->base.state);

                __drm_atomic_helper_crtc_destroy_state(&crtc_state->uapi);
                intel_crtc_free_hw_state(crtc_state);
                intel_crtc_state_reset(crtc_state, crtc);

                intel_crtc_get_pipe_config(crtc_state);

                crtc_state->hw.enable = crtc_state->hw.active;

                crtc->base.enabled = crtc_state->hw.enable;
                crtc->active = crtc_state->hw.active;

                if (crtc_state->hw.active)
                        active_pipes |= BIT(crtc->pipe);

                drm_dbg_kms(&dev_priv->drm,
                            "[CRTC:%d:%s] hw state readout: %s\n",
                            crtc->base.base.id, crtc->base.name,
                            enableddisabled(crtc_state->hw.active));
        }

        dev_priv->active_pipes = cdclk_state->active_pipes =
                dbuf_state->active_pipes = active_pipes;

        readout_plane_state(dev_priv);

        for_each_intel_encoder(dev, encoder) {
                pipe = 0;

                if (encoder->get_hw_state(encoder, &pipe)) {
                        struct intel_crtc_state *crtc_state;

                        crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
                        crtc_state = to_intel_crtc_state(crtc->base.state);

                        encoder->base.crtc = &crtc->base;
                        intel_encoder_get_config(encoder, crtc_state);
                        if (encoder->sync_state)
                                encoder->sync_state(encoder, crtc_state);

                        /* read out to slave crtc as well for bigjoiner */
                        if (crtc_state->bigjoiner) {
                                /* encoder should read be linked to bigjoiner master */
                                WARN_ON(crtc_state->bigjoiner_slave);

                                crtc = crtc_state->bigjoiner_linked_crtc;
                                crtc_state = to_intel_crtc_state(crtc->base.state);
                                intel_encoder_get_config(encoder, crtc_state);
                        }
                } else {
                        encoder->base.crtc = NULL;
                }

                drm_dbg_kms(&dev_priv->drm,
                            "[ENCODER:%d:%s] hw state readout: %s, pipe %c\n",
                            encoder->base.base.id, encoder->base.name,
                            enableddisabled(encoder->base.crtc),
                            pipe_name(pipe));
        }

        intel_dpll_readout_hw_state(dev_priv);

        drm_connector_list_iter_begin(dev, &conn_iter);
        for_each_intel_connector_iter(connector, &conn_iter) {
                if (connector->get_hw_state(connector)) {
                        struct intel_crtc_state *crtc_state;
                        struct intel_crtc *crtc;

                        connector->base.dpms = DRM_MODE_DPMS_ON;

                        encoder = intel_attached_encoder(connector);
                        connector->base.encoder = &encoder->base;

                        crtc = to_intel_crtc(encoder->base.crtc);
                        crtc_state = crtc ? to_intel_crtc_state(crtc->base.state) : NULL;

                        if (crtc_state && crtc_state->hw.active) {
                                /*
                                 * This has to be done during hardware readout
                                 * because anything calling .crtc_disable may
                                 * rely on the connector_mask being accurate.
                                 */
                                crtc_state->uapi.connector_mask |=
                                        drm_connector_mask(&connector->base);
                                crtc_state->uapi.encoder_mask |=
                                        drm_encoder_mask(&encoder->base);
                        }
                } else {
                        connector->base.dpms = DRM_MODE_DPMS_OFF;
                        connector->base.encoder = NULL;
                }
                drm_dbg_kms(&dev_priv->drm,
                            "[CONNECTOR:%d:%s] hw state readout: %s\n",
                            connector->base.base.id, connector->base.name,
                            enableddisabled(connector->base.encoder));
        }
        drm_connector_list_iter_end(&conn_iter);

        for_each_intel_crtc(dev, crtc) {
                struct intel_bw_state *bw_state =
                        to_intel_bw_state(dev_priv->bw_obj.state);
                struct intel_crtc_state *crtc_state =
                        to_intel_crtc_state(crtc->base.state);
                struct intel_plane *plane;
                int min_cdclk = 0;

                if (crtc_state->bigjoiner_slave)
                        continue;

                if (crtc_state->hw.active) {
                        /*
                         * The initial mode needs to be set in order to keep
                         * the atomic core happy. It wants a valid mode if the
                         * crtc's enabled, so we do the above call.
                         *
                         * But we don't set all the derived state fully, hence
                         * set a flag to indicate that a full recalculation is
                         * needed on the next commit.
                         */
                        crtc_state->inherited = true;

                        intel_crtc_update_active_timings(crtc_state);

                        intel_crtc_copy_hw_to_uapi_state(crtc_state);
                }

                for_each_intel_plane_on_crtc(&dev_priv->drm, crtc, plane) {
                        const struct intel_plane_state *plane_state =
                                to_intel_plane_state(plane->base.state);

                        /*
                         * FIXME don't have the fb yet, so can't
                         * use intel_plane_data_rate() :(
                         */
                        if (plane_state->uapi.visible)
                                crtc_state->data_rate[plane->id] =
                                        4 * crtc_state->pixel_rate;
                        /*
                         * FIXME don't have the fb yet, so can't
                         * use plane->min_cdclk() :(
                         */
                        if (plane_state->uapi.visible && plane->min_cdclk) {
                                if (crtc_state->double_wide || DISPLAY_VER(dev_priv) >= 10)
                                        crtc_state->min_cdclk[plane->id] =
                                                DIV_ROUND_UP(crtc_state->pixel_rate, 2);
                                else
                                        crtc_state->min_cdclk[plane->id] =
                                                crtc_state->pixel_rate;
                        }
                        drm_dbg_kms(&dev_priv->drm,
                                    "[PLANE:%d:%s] min_cdclk %d kHz\n",
                                    plane->base.base.id, plane->base.name,
                                    crtc_state->min_cdclk[plane->id]);
                }

                if (crtc_state->hw.active) {
                        min_cdclk = intel_crtc_compute_min_cdclk(crtc_state);
                        if (drm_WARN_ON(dev, min_cdclk < 0))
                                min_cdclk = 0;
                }

                cdclk_state->min_cdclk[crtc->pipe] = min_cdclk;
                cdclk_state->min_voltage_level[crtc->pipe] =
                        crtc_state->min_voltage_level;

                intel_bw_crtc_update(bw_state, crtc_state);

                intel_pipe_config_sanity_check(dev_priv, crtc_state);

                /* discard our incomplete slave state, copy it from master */
                if (crtc_state->bigjoiner && crtc_state->hw.active) {
                        struct intel_crtc *slave = crtc_state->bigjoiner_linked_crtc;
                        struct intel_crtc_state *slave_crtc_state =
                                to_intel_crtc_state(slave->base.state);

                        copy_bigjoiner_crtc_state(slave_crtc_state, crtc_state);
                        slave->base.mode = crtc->base.mode;

                        cdclk_state->min_cdclk[slave->pipe] = min_cdclk;
                        cdclk_state->min_voltage_level[slave->pipe] =
                                crtc_state->min_voltage_level;

                        for_each_intel_plane_on_crtc(&dev_priv->drm, slave, plane) {
                                const struct intel_plane_state *plane_state =
                                        to_intel_plane_state(plane->base.state);

                                /*
                                 * FIXME don't have the fb yet, so can't
                                 * use intel_plane_data_rate() :(
                                 */
                                if (plane_state->uapi.visible)
                                        crtc_state->data_rate[plane->id] =
                                                4 * crtc_state->pixel_rate;
                                else
                                        crtc_state->data_rate[plane->id] = 0;
                        }

                        intel_bw_crtc_update(bw_state, slave_crtc_state);
                        drm_calc_timestamping_constants(&slave->base,
                                                        &slave_crtc_state->hw.adjusted_mode);
                }
        }
}

static void
get_encoder_power_domains(struct drm_i915_private *dev_priv)
{
        struct intel_encoder *encoder;

        for_each_intel_encoder(&dev_priv->drm, encoder) {
                struct intel_crtc_state *crtc_state;

                if (!encoder->get_power_domains)
                        continue;

                /*
                 * MST-primary and inactive encoders don't have a crtc state
                 * and neither of these require any power domain references.
                 */
                if (!encoder->base.crtc)
                        continue;

                crtc_state = to_intel_crtc_state(encoder->base.crtc->state);
                encoder->get_power_domains(encoder, crtc_state);
        }
}

static void intel_early_display_was(struct drm_i915_private *dev_priv)
{
        /*
         * Display WA #1185 WaDisableDARBFClkGating:glk,icl,ehl,tgl
         * Also known as Wa_14010480278.
         */
        if (IS_DISPLAY_VER(dev_priv, 10, 12))
                intel_de_write(dev_priv, GEN9_CLKGATE_DIS_0,
                               intel_de_read(dev_priv, GEN9_CLKGATE_DIS_0) | DARBF_GATING_DIS);

        if (IS_HASWELL(dev_priv)) {
                /*
                 * WaRsPkgCStateDisplayPMReq:hsw
                 * System hang if this isn't done before disabling all planes!
                 */
                intel_de_write(dev_priv, CHICKEN_PAR1_1,
                               intel_de_read(dev_priv, CHICKEN_PAR1_1) | FORCE_ARB_IDLE_PLANES);
        }

        if (IS_KABYLAKE(dev_priv) || IS_COFFEELAKE(dev_priv) || IS_COMETLAKE(dev_priv)) {
                /* Display WA #1142:kbl,cfl,cml */
                intel_de_rmw(dev_priv, CHICKEN_PAR1_1,
                             KBL_ARB_FILL_SPARE_22, KBL_ARB_FILL_SPARE_22);
                intel_de_rmw(dev_priv, CHICKEN_MISC_2,
                             KBL_ARB_FILL_SPARE_13 | KBL_ARB_FILL_SPARE_14,
                             KBL_ARB_FILL_SPARE_14);
        }
}

static void ibx_sanitize_pch_hdmi_port(struct drm_i915_private *dev_priv,
                                       enum port port, i915_reg_t hdmi_reg)
{
        u32 val = intel_de_read(dev_priv, hdmi_reg);

        if (val & SDVO_ENABLE ||
            (val & SDVO_PIPE_SEL_MASK) == SDVO_PIPE_SEL(PIPE_A))
                return;

        drm_dbg_kms(&dev_priv->drm,
                    "Sanitizing transcoder select for HDMI %c\n",
                    port_name(port));

        val &= ~SDVO_PIPE_SEL_MASK;
        val |= SDVO_PIPE_SEL(PIPE_A);

        intel_de_write(dev_priv, hdmi_reg, val);
}

static void ibx_sanitize_pch_dp_port(struct drm_i915_private *dev_priv,
                                     enum port port, i915_reg_t dp_reg)
{
        u32 val = intel_de_read(dev_priv, dp_reg);

        if (val & DP_PORT_EN ||
            (val & DP_PIPE_SEL_MASK) == DP_PIPE_SEL(PIPE_A))
                return;

        drm_dbg_kms(&dev_priv->drm,
                    "Sanitizing transcoder select for DP %c\n",
                    port_name(port));

        val &= ~DP_PIPE_SEL_MASK;
        val |= DP_PIPE_SEL(PIPE_A);

        intel_de_write(dev_priv, dp_reg, val);
}

static void ibx_sanitize_pch_ports(struct drm_i915_private *dev_priv)
{
        /*
         * The BIOS may select transcoder B on some of the PCH
         * ports even it doesn't enable the port. This would trip
         * assert_pch_dp_disabled() and assert_pch_hdmi_disabled().
         * Sanitize the transcoder select bits to prevent that. We
         * assume that the BIOS never actually enabled the port,
         * because if it did we'd actually have to toggle the port
         * on and back off to make the transcoder A select stick
         * (see. intel_dp_link_down(), intel_disable_hdmi(),
         * intel_disable_sdvo()).
         */
        ibx_sanitize_pch_dp_port(dev_priv, PORT_B, PCH_DP_B);
        ibx_sanitize_pch_dp_port(dev_priv, PORT_C, PCH_DP_C);
        ibx_sanitize_pch_dp_port(dev_priv, PORT_D, PCH_DP_D);

        /* PCH SDVOB multiplex with HDMIB */
        ibx_sanitize_pch_hdmi_port(dev_priv, PORT_B, PCH_HDMIB);
        ibx_sanitize_pch_hdmi_port(dev_priv, PORT_C, PCH_HDMIC);
        ibx_sanitize_pch_hdmi_port(dev_priv, PORT_D, PCH_HDMID);
}

/* Scan out the current hw modeset state,
 * and sanitizes it to the current state
 */
static void
intel_modeset_setup_hw_state(struct drm_device *dev,
                             struct drm_modeset_acquire_ctx *ctx)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_encoder *encoder;
        struct intel_crtc *crtc;
        intel_wakeref_t wakeref;

        wakeref = intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);

        intel_early_display_was(dev_priv);
        intel_modeset_readout_hw_state(dev);

        /* HW state is read out, now we need to sanitize this mess. */

        /* Sanitize the TypeC port mode upfront, encoders depend on this */
        for_each_intel_encoder(dev, encoder) {
                enum phy phy = intel_port_to_phy(dev_priv, encoder->port);

                /* We need to sanitize only the MST primary port. */
                if (encoder->type != INTEL_OUTPUT_DP_MST &&
                    intel_phy_is_tc(dev_priv, phy))
                        intel_tc_port_sanitize(enc_to_dig_port(encoder));
        }

        get_encoder_power_domains(dev_priv);

        if (HAS_PCH_IBX(dev_priv))
                ibx_sanitize_pch_ports(dev_priv);

        /*
         * intel_sanitize_plane_mapping() may need to do vblank
         * waits, so we need vblank interrupts restored beforehand.
         */
        for_each_intel_crtc(&dev_priv->drm, crtc) {
                struct intel_crtc_state *crtc_state =
                        to_intel_crtc_state(crtc->base.state);

                drm_crtc_vblank_reset(&crtc->base);

                if (crtc_state->hw.active)
                        intel_crtc_vblank_on(crtc_state);
        }

        intel_sanitize_plane_mapping(dev_priv);

        for_each_intel_encoder(dev, encoder)
                intel_sanitize_encoder(encoder);

        for_each_intel_crtc(&dev_priv->drm, crtc) {
                struct intel_crtc_state *crtc_state =
                        to_intel_crtc_state(crtc->base.state);

                intel_sanitize_crtc(crtc, ctx);
                intel_dump_pipe_config(crtc_state, NULL, "[setup_hw_state]");
        }

        intel_modeset_update_connector_atomic_state(dev);

        intel_dpll_sanitize_state(dev_priv);

        if (IS_G4X(dev_priv)) {
                g4x_wm_get_hw_state(dev_priv);
                g4x_wm_sanitize(dev_priv);
        } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
                vlv_wm_get_hw_state(dev_priv);
                vlv_wm_sanitize(dev_priv);
        } else if (DISPLAY_VER(dev_priv) >= 9) {
                skl_wm_get_hw_state(dev_priv);
        } else if (HAS_PCH_SPLIT(dev_priv)) {
                ilk_wm_get_hw_state(dev_priv);
        }

        for_each_intel_crtc(dev, crtc) {
                struct intel_crtc_state *crtc_state =
                        to_intel_crtc_state(crtc->base.state);
                u64 put_domains;

                put_domains = modeset_get_crtc_power_domains(crtc_state);
                if (drm_WARN_ON(dev, put_domains))
                        modeset_put_crtc_power_domains(crtc, put_domains);
        }

        intel_display_power_put(dev_priv, POWER_DOMAIN_INIT, wakeref);
}

void intel_display_resume(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_atomic_state *state = dev_priv->modeset_restore_state;
        struct drm_modeset_acquire_ctx ctx;
        int ret;

        if (!HAS_DISPLAY(dev_priv))
                return;

        dev_priv->modeset_restore_state = NULL;
        if (state)
                state->acquire_ctx = &ctx;

        drm_modeset_acquire_init(&ctx, 0);

        while (1) {
                ret = drm_modeset_lock_all_ctx(dev, &ctx);
                if (ret != -EDEADLK)
                        break;

                drm_modeset_backoff(&ctx);
        }

        if (!ret)
                ret = __intel_display_resume(dev, state, &ctx);

        intel_enable_ipc(dev_priv);
        drm_modeset_drop_locks(&ctx);
        drm_modeset_acquire_fini(&ctx);

        if (ret)
                drm_err(&dev_priv->drm,
                        "Restoring old state failed with %i\n", ret);
        if (state)
                drm_atomic_state_put(state);
}

static void intel_hpd_poll_fini(struct drm_i915_private *i915)
{
        struct intel_connector *connector;
        struct drm_connector_list_iter conn_iter;

        /* Kill all the work that may have been queued by hpd. */
        drm_connector_list_iter_begin(&i915->drm, &conn_iter);
        for_each_intel_connector_iter(connector, &conn_iter) {
                if (connector->modeset_retry_work.func)
                        cancel_work_sync(&connector->modeset_retry_work);
                if (connector->hdcp.shim) {
                        cancel_delayed_work_sync(&connector->hdcp.check_work);
                        cancel_work_sync(&connector->hdcp.prop_work);
                }
        }
        drm_connector_list_iter_end(&conn_iter);
}

/* part #1: call before irq uninstall */
void intel_modeset_driver_remove(struct drm_i915_private *i915)
{
        if (!HAS_DISPLAY(i915))
                return;

        flush_workqueue(i915->flip_wq);
        flush_workqueue(i915->modeset_wq);

        flush_work(&i915->atomic_helper.free_work);
        drm_WARN_ON(&i915->drm, !llist_empty(&i915->atomic_helper.free_list));
}

/* part #2: call after irq uninstall */
void intel_modeset_driver_remove_noirq(struct drm_i915_private *i915)
{
        if (!HAS_DISPLAY(i915))
                return;

        /*
         * Due to the hpd irq storm handling the hotplug work can re-arm the
         * poll handlers. Hence disable polling after hpd handling is shut down.
         */
        intel_hpd_poll_fini(i915);

        /*
         * MST topology needs to be suspended so we don't have any calls to
         * fbdev after it's finalized. MST will be destroyed later as part of
         * drm_mode_config_cleanup()
         */
        intel_dp_mst_suspend(i915);

        /* poll work can call into fbdev, hence clean that up afterwards */
        intel_fbdev_fini(i915);

        intel_unregister_dsm_handler();

        intel_fbc_global_disable(i915);

        /* flush any delayed tasks or pending work */
        flush_scheduled_work();

        intel_hdcp_component_fini(i915);

        intel_mode_config_cleanup(i915);

        intel_overlay_cleanup(i915);

        intel_gmbus_teardown(i915);

        destroy_workqueue(i915->flip_wq);
        destroy_workqueue(i915->modeset_wq);

        intel_fbc_cleanup_cfb(i915);
}

/* part #3: call after gem init */
void intel_modeset_driver_remove_nogem(struct drm_i915_private *i915)
{
        intel_dmc_ucode_fini(i915);

        intel_power_domains_driver_remove(i915);

        intel_vga_unregister(i915);

        intel_bios_driver_remove(i915);
}

void intel_display_driver_register(struct drm_i915_private *i915)
{
        if (!HAS_DISPLAY(i915))
                return;

        intel_display_debugfs_register(i915);

        /* Must be done after probing outputs */
        intel_opregion_register(i915);
        acpi_video_register();

        intel_audio_init(i915);

        /*
         * Some ports require correctly set-up hpd registers for
         * detection to work properly (leading to ghost connected
         * connector status), e.g. VGA on gm45.  Hence we can only set
         * up the initial fbdev config after hpd irqs are fully
         * enabled. We do it last so that the async config cannot run
         * before the connectors are registered.
         */
        intel_fbdev_initial_config_async(&i915->drm);

        /*
         * We need to coordinate the hotplugs with the asynchronous
         * fbdev configuration, for which we use the
         * fbdev->async_cookie.
         */
        drm_kms_helper_poll_init(&i915->drm);
}

void intel_display_driver_unregister(struct drm_i915_private *i915)
{
        if (!HAS_DISPLAY(i915))
                return;

        intel_fbdev_unregister(i915);
        intel_audio_deinit(i915);

        /*
         * After flushing the fbdev (incl. a late async config which
         * will have delayed queuing of a hotplug event), then flush
         * the hotplug events.
         */
        drm_kms_helper_poll_fini(&i915->drm);
        drm_atomic_helper_shutdown(&i915->drm);

        acpi_video_unregister();
        intel_opregion_unregister(i915);
}