+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
- */
-
-#include <linux/clk.h>
-#include <linux/gpio/consumer.h>
-#include <linux/regulator/consumer.h>
-#include <drm/dp/drm_dp_helper.h>
-#include <drm/drm_crtc.h>
-#include <drm/drm_edid.h>
-
-#include "edp.h"
-#include "edp.xml.h"
-
-#define VDDA_UA_ON_LOAD 100000 /* uA units */
-#define VDDA_UA_OFF_LOAD 100 /* uA units */
-
-#define DPCD_LINK_VOLTAGE_MAX 4
-#define DPCD_LINK_PRE_EMPHASIS_MAX 4
-
-#define EDP_LINK_BW_MAX DP_LINK_BW_2_7
-
-/* Link training return value */
-#define EDP_TRAIN_FAIL -1
-#define EDP_TRAIN_SUCCESS 0
-#define EDP_TRAIN_RECONFIG 1
-
-#define EDP_CLK_MASK_AHB BIT(0)
-#define EDP_CLK_MASK_AUX BIT(1)
-#define EDP_CLK_MASK_LINK BIT(2)
-#define EDP_CLK_MASK_PIXEL BIT(3)
-#define EDP_CLK_MASK_MDP_CORE BIT(4)
-#define EDP_CLK_MASK_LINK_CHAN (EDP_CLK_MASK_LINK | EDP_CLK_MASK_PIXEL)
-#define EDP_CLK_MASK_AUX_CHAN \
- (EDP_CLK_MASK_AHB | EDP_CLK_MASK_AUX | EDP_CLK_MASK_MDP_CORE)
-#define EDP_CLK_MASK_ALL (EDP_CLK_MASK_AUX_CHAN | EDP_CLK_MASK_LINK_CHAN)
-
-#define EDP_BACKLIGHT_MAX 255
-
-#define EDP_INTR_STATUS1 \
- (EDP_INTERRUPT_REG_1_HPD | EDP_INTERRUPT_REG_1_AUX_I2C_DONE | \
- EDP_INTERRUPT_REG_1_WRONG_ADDR | EDP_INTERRUPT_REG_1_TIMEOUT | \
- EDP_INTERRUPT_REG_1_NACK_DEFER | EDP_INTERRUPT_REG_1_WRONG_DATA_CNT | \
- EDP_INTERRUPT_REG_1_I2C_NACK | EDP_INTERRUPT_REG_1_I2C_DEFER | \
- EDP_INTERRUPT_REG_1_PLL_UNLOCK | EDP_INTERRUPT_REG_1_AUX_ERROR)
-#define EDP_INTR_MASK1 (EDP_INTR_STATUS1 << 2)
-#define EDP_INTR_STATUS2 \
- (EDP_INTERRUPT_REG_2_READY_FOR_VIDEO | \
- EDP_INTERRUPT_REG_2_IDLE_PATTERNs_SENT | \
- EDP_INTERRUPT_REG_2_FRAME_END | EDP_INTERRUPT_REG_2_CRC_UPDATED)
-#define EDP_INTR_MASK2 (EDP_INTR_STATUS2 << 2)
-
-struct edp_ctrl {
- struct platform_device *pdev;
-
- void __iomem *base;
-
- /* regulators */
- struct regulator *vdda_vreg; /* 1.8 V */
- struct regulator *lvl_vreg;
-
- /* clocks */
- struct clk *aux_clk;
- struct clk *pixel_clk;
- struct clk *ahb_clk;
- struct clk *link_clk;
- struct clk *mdp_core_clk;
-
- /* gpios */
- struct gpio_desc *panel_en_gpio;
- struct gpio_desc *panel_hpd_gpio;
-
- /* completion and mutex */
- struct completion idle_comp;
- struct mutex dev_mutex; /* To protect device power status */
-
- /* work queue */
- struct work_struct on_work;
- struct work_struct off_work;
- struct workqueue_struct *workqueue;
-
- /* Interrupt register lock */
- spinlock_t irq_lock;
-
- bool edp_connected;
- bool power_on;
-
- /* edid raw data */
- struct edid *edid;
-
- struct drm_dp_aux *drm_aux;
-
- /* dpcd raw data */
- u8 dpcd[DP_RECEIVER_CAP_SIZE];
-
- /* Link status */
- u8 link_rate;
- u8 lane_cnt;
- u8 v_level;
- u8 p_level;
-
- /* Timing status */
- u8 interlaced;
- u32 pixel_rate; /* in kHz */
- u32 color_depth;
-
- struct edp_aux *aux;
- struct edp_phy *phy;
-};
-
-struct edp_pixel_clk_div {
- u32 rate; /* in kHz */
- u32 m;
- u32 n;
-};
-
-#define EDP_PIXEL_CLK_NUM 8
-static const struct edp_pixel_clk_div clk_divs[2][EDP_PIXEL_CLK_NUM] = {
- { /* Link clock = 162MHz, source clock = 810MHz */
- {119000, 31, 211}, /* WSXGA+ 1680x1050@60Hz CVT */
- {130250, 32, 199}, /* UXGA 1600x1200@60Hz CVT */
- {148500, 11, 60}, /* FHD 1920x1080@60Hz */
- {154000, 50, 263}, /* WUXGA 1920x1200@60Hz CVT */
- {209250, 31, 120}, /* QXGA 2048x1536@60Hz CVT */
- {268500, 119, 359}, /* WQXGA 2560x1600@60Hz CVT */
- {138530, 33, 193}, /* AUO B116HAN03.0 Panel */
- {141400, 48, 275}, /* AUO B133HTN01.2 Panel */
- },
- { /* Link clock = 270MHz, source clock = 675MHz */
- {119000, 52, 295}, /* WSXGA+ 1680x1050@60Hz CVT */
- {130250, 11, 57}, /* UXGA 1600x1200@60Hz CVT */
- {148500, 11, 50}, /* FHD 1920x1080@60Hz */
- {154000, 47, 206}, /* WUXGA 1920x1200@60Hz CVT */
- {209250, 31, 100}, /* QXGA 2048x1536@60Hz CVT */
- {268500, 107, 269}, /* WQXGA 2560x1600@60Hz CVT */
- {138530, 63, 307}, /* AUO B116HAN03.0 Panel */
- {141400, 53, 253}, /* AUO B133HTN01.2 Panel */
- },
-};
-
-static int edp_clk_init(struct edp_ctrl *ctrl)
-{
- struct platform_device *pdev = ctrl->pdev;
- int ret;
-
- ctrl->aux_clk = msm_clk_get(pdev, "core");
- if (IS_ERR(ctrl->aux_clk)) {
- ret = PTR_ERR(ctrl->aux_clk);
- pr_err("%s: Can't find core clock, %d\n", __func__, ret);
- ctrl->aux_clk = NULL;
- return ret;
- }
-
- ctrl->pixel_clk = msm_clk_get(pdev, "pixel");
- if (IS_ERR(ctrl->pixel_clk)) {
- ret = PTR_ERR(ctrl->pixel_clk);
- pr_err("%s: Can't find pixel clock, %d\n", __func__, ret);
- ctrl->pixel_clk = NULL;
- return ret;
- }
-
- ctrl->ahb_clk = msm_clk_get(pdev, "iface");
- if (IS_ERR(ctrl->ahb_clk)) {
- ret = PTR_ERR(ctrl->ahb_clk);
- pr_err("%s: Can't find iface clock, %d\n", __func__, ret);
- ctrl->ahb_clk = NULL;
- return ret;
- }
-
- ctrl->link_clk = msm_clk_get(pdev, "link");
- if (IS_ERR(ctrl->link_clk)) {
- ret = PTR_ERR(ctrl->link_clk);
- pr_err("%s: Can't find link clock, %d\n", __func__, ret);
- ctrl->link_clk = NULL;
- return ret;
- }
-
- /* need mdp core clock to receive irq */
- ctrl->mdp_core_clk = msm_clk_get(pdev, "mdp_core");
- if (IS_ERR(ctrl->mdp_core_clk)) {
- ret = PTR_ERR(ctrl->mdp_core_clk);
- pr_err("%s: Can't find mdp_core clock, %d\n", __func__, ret);
- ctrl->mdp_core_clk = NULL;
- return ret;
- }
-
- return 0;
-}
-
-static int edp_clk_enable(struct edp_ctrl *ctrl, u32 clk_mask)
-{
- int ret;
-
- DBG("mask=%x", clk_mask);
- /* ahb_clk should be enabled first */
- if (clk_mask & EDP_CLK_MASK_AHB) {
- ret = clk_prepare_enable(ctrl->ahb_clk);
- if (ret) {
- pr_err("%s: Failed to enable ahb clk\n", __func__);
- goto f0;
- }
- }
- if (clk_mask & EDP_CLK_MASK_AUX) {
- ret = clk_set_rate(ctrl->aux_clk, 19200000);
- if (ret) {
- pr_err("%s: Failed to set rate aux clk\n", __func__);
- goto f1;
- }
- ret = clk_prepare_enable(ctrl->aux_clk);
- if (ret) {
- pr_err("%s: Failed to enable aux clk\n", __func__);
- goto f1;
- }
- }
- /* Need to set rate and enable link_clk prior to pixel_clk */
- if (clk_mask & EDP_CLK_MASK_LINK) {
- DBG("edp->link_clk, set_rate %ld",
- (unsigned long)ctrl->link_rate * 27000000);
- ret = clk_set_rate(ctrl->link_clk,
- (unsigned long)ctrl->link_rate * 27000000);
- if (ret) {
- pr_err("%s: Failed to set rate to link clk\n",
- __func__);
- goto f2;
- }
-
- ret = clk_prepare_enable(ctrl->link_clk);
- if (ret) {
- pr_err("%s: Failed to enable link clk\n", __func__);
- goto f2;
- }
- }
- if (clk_mask & EDP_CLK_MASK_PIXEL) {
- DBG("edp->pixel_clk, set_rate %ld",
- (unsigned long)ctrl->pixel_rate * 1000);
- ret = clk_set_rate(ctrl->pixel_clk,
- (unsigned long)ctrl->pixel_rate * 1000);
- if (ret) {
- pr_err("%s: Failed to set rate to pixel clk\n",
- __func__);
- goto f3;
- }
-
- ret = clk_prepare_enable(ctrl->pixel_clk);
- if (ret) {
- pr_err("%s: Failed to enable pixel clk\n", __func__);
- goto f3;
- }
- }
- if (clk_mask & EDP_CLK_MASK_MDP_CORE) {
- ret = clk_prepare_enable(ctrl->mdp_core_clk);
- if (ret) {
- pr_err("%s: Failed to enable mdp core clk\n", __func__);
- goto f4;
- }
- }
-
- return 0;
-
-f4:
- if (clk_mask & EDP_CLK_MASK_PIXEL)
- clk_disable_unprepare(ctrl->pixel_clk);
-f3:
- if (clk_mask & EDP_CLK_MASK_LINK)
- clk_disable_unprepare(ctrl->link_clk);
-f2:
- if (clk_mask & EDP_CLK_MASK_AUX)
- clk_disable_unprepare(ctrl->aux_clk);
-f1:
- if (clk_mask & EDP_CLK_MASK_AHB)
- clk_disable_unprepare(ctrl->ahb_clk);
-f0:
- return ret;
-}
-
-static void edp_clk_disable(struct edp_ctrl *ctrl, u32 clk_mask)
-{
- if (clk_mask & EDP_CLK_MASK_MDP_CORE)
- clk_disable_unprepare(ctrl->mdp_core_clk);
- if (clk_mask & EDP_CLK_MASK_PIXEL)
- clk_disable_unprepare(ctrl->pixel_clk);
- if (clk_mask & EDP_CLK_MASK_LINK)
- clk_disable_unprepare(ctrl->link_clk);
- if (clk_mask & EDP_CLK_MASK_AUX)
- clk_disable_unprepare(ctrl->aux_clk);
- if (clk_mask & EDP_CLK_MASK_AHB)
- clk_disable_unprepare(ctrl->ahb_clk);
-}
-
-static int edp_regulator_init(struct edp_ctrl *ctrl)
-{
- struct device *dev = &ctrl->pdev->dev;
- int ret;
-
- DBG("");
- ctrl->vdda_vreg = devm_regulator_get(dev, "vdda");
- ret = PTR_ERR_OR_ZERO(ctrl->vdda_vreg);
- if (ret) {
- pr_err("%s: Could not get vdda reg, ret = %d\n", __func__,
- ret);
- ctrl->vdda_vreg = NULL;
- return ret;
- }
- ctrl->lvl_vreg = devm_regulator_get(dev, "lvl-vdd");
- ret = PTR_ERR_OR_ZERO(ctrl->lvl_vreg);
- if (ret) {
- pr_err("%s: Could not get lvl-vdd reg, ret = %d\n", __func__,
- ret);
- ctrl->lvl_vreg = NULL;
- return ret;
- }
-
- return 0;
-}
-
-static int edp_regulator_enable(struct edp_ctrl *ctrl)
-{
- int ret;
-
- ret = regulator_set_load(ctrl->vdda_vreg, VDDA_UA_ON_LOAD);
- if (ret < 0) {
- pr_err("%s: vdda_vreg set regulator mode failed.\n", __func__);
- goto vdda_set_fail;
- }
-
- ret = regulator_enable(ctrl->vdda_vreg);
- if (ret) {
- pr_err("%s: Failed to enable vdda_vreg regulator.\n", __func__);
- goto vdda_enable_fail;
- }
-
- ret = regulator_enable(ctrl->lvl_vreg);
- if (ret) {
- pr_err("Failed to enable lvl-vdd reg regulator, %d", ret);
- goto lvl_enable_fail;
- }
-
- DBG("exit");
- return 0;
-
-lvl_enable_fail:
- regulator_disable(ctrl->vdda_vreg);
-vdda_enable_fail:
- regulator_set_load(ctrl->vdda_vreg, VDDA_UA_OFF_LOAD);
-vdda_set_fail:
- return ret;
-}
-
-static void edp_regulator_disable(struct edp_ctrl *ctrl)
-{
- regulator_disable(ctrl->lvl_vreg);
- regulator_disable(ctrl->vdda_vreg);
- regulator_set_load(ctrl->vdda_vreg, VDDA_UA_OFF_LOAD);
-}
-
-static int edp_gpio_config(struct edp_ctrl *ctrl)
-{
- struct device *dev = &ctrl->pdev->dev;
- int ret;
-
- ctrl->panel_hpd_gpio = devm_gpiod_get(dev, "panel-hpd", GPIOD_IN);
- if (IS_ERR(ctrl->panel_hpd_gpio)) {
- ret = PTR_ERR(ctrl->panel_hpd_gpio);
- ctrl->panel_hpd_gpio = NULL;
- pr_err("%s: cannot get panel-hpd-gpios, %d\n", __func__, ret);
- return ret;
- }
-
- ctrl->panel_en_gpio = devm_gpiod_get(dev, "panel-en", GPIOD_OUT_LOW);
- if (IS_ERR(ctrl->panel_en_gpio)) {
- ret = PTR_ERR(ctrl->panel_en_gpio);
- ctrl->panel_en_gpio = NULL;
- pr_err("%s: cannot get panel-en-gpios, %d\n", __func__, ret);
- return ret;
- }
-
- DBG("gpio on");
-
- return 0;
-}
-
-static void edp_ctrl_irq_enable(struct edp_ctrl *ctrl, int enable)
-{
- unsigned long flags;
-
- DBG("%d", enable);
- spin_lock_irqsave(&ctrl->irq_lock, flags);
- if (enable) {
- edp_write(ctrl->base + REG_EDP_INTERRUPT_REG_1, EDP_INTR_MASK1);
- edp_write(ctrl->base + REG_EDP_INTERRUPT_REG_2, EDP_INTR_MASK2);
- } else {
- edp_write(ctrl->base + REG_EDP_INTERRUPT_REG_1, 0x0);
- edp_write(ctrl->base + REG_EDP_INTERRUPT_REG_2, 0x0);
- }
- spin_unlock_irqrestore(&ctrl->irq_lock, flags);
- DBG("exit");
-}
-
-static void edp_fill_link_cfg(struct edp_ctrl *ctrl)
-{
- u32 prate;
- u32 lrate;
- u32 bpp;
- u8 max_lane = drm_dp_max_lane_count(ctrl->dpcd);
- u8 lane;
-
- prate = ctrl->pixel_rate;
- bpp = ctrl->color_depth * 3;
-
- /*
- * By default, use the maximum link rate and minimum lane count,
- * so that we can do rate down shift during link training.
- */
- ctrl->link_rate = ctrl->dpcd[DP_MAX_LINK_RATE];
-
- prate *= bpp;
- prate /= 8; /* in kByte */
-
- lrate = 270000; /* in kHz */
- lrate *= ctrl->link_rate;
- lrate /= 10; /* in kByte, 10 bits --> 8 bits */
-
- for (lane = 1; lane <= max_lane; lane <<= 1) {
- if (lrate >= prate)
- break;
- lrate <<= 1;
- }
-
- ctrl->lane_cnt = lane;
- DBG("rate=%d lane=%d", ctrl->link_rate, ctrl->lane_cnt);
-}
-
-static void edp_config_ctrl(struct edp_ctrl *ctrl)
-{
- u32 data;
- enum edp_color_depth depth;
-
- data = EDP_CONFIGURATION_CTRL_LANES(ctrl->lane_cnt - 1);
-
- if (drm_dp_enhanced_frame_cap(ctrl->dpcd))
- data |= EDP_CONFIGURATION_CTRL_ENHANCED_FRAMING;
-
- depth = EDP_6BIT;
- if (ctrl->color_depth == 8)
- depth = EDP_8BIT;
-
- data |= EDP_CONFIGURATION_CTRL_COLOR(depth);
-
- if (!ctrl->interlaced) /* progressive */
- data |= EDP_CONFIGURATION_CTRL_PROGRESSIVE;
-
- data |= (EDP_CONFIGURATION_CTRL_SYNC_CLK |
- EDP_CONFIGURATION_CTRL_STATIC_MVID);
-
- edp_write(ctrl->base + REG_EDP_CONFIGURATION_CTRL, data);
-}
-
-static void edp_state_ctrl(struct edp_ctrl *ctrl, u32 state)
-{
- edp_write(ctrl->base + REG_EDP_STATE_CTRL, state);
- /* Make sure H/W status is set */
- wmb();
-}
-
-static int edp_lane_set_write(struct edp_ctrl *ctrl,
- u8 voltage_level, u8 pre_emphasis_level)
-{
- int i;
- u8 buf[4];
-
- if (voltage_level >= DPCD_LINK_VOLTAGE_MAX)
- voltage_level |= 0x04;
-
- if (pre_emphasis_level >= DPCD_LINK_PRE_EMPHASIS_MAX)
- pre_emphasis_level |= 0x04;
-
- pre_emphasis_level <<= 3;
-
- for (i = 0; i < 4; i++)
- buf[i] = voltage_level | pre_emphasis_level;
-
- DBG("%s: p|v=0x%x", __func__, voltage_level | pre_emphasis_level);
- if (drm_dp_dpcd_write(ctrl->drm_aux, 0x103, buf, 4) < 4) {
- pr_err("%s: Set sw/pe to panel failed\n", __func__);
- return -ENOLINK;
- }
-
- return 0;
-}
-
-static int edp_train_pattern_set_write(struct edp_ctrl *ctrl, u8 pattern)
-{
- u8 p = pattern;
-
- DBG("pattern=%x", p);
- if (drm_dp_dpcd_write(ctrl->drm_aux,
- DP_TRAINING_PATTERN_SET, &p, 1) < 1) {
- pr_err("%s: Set training pattern to panel failed\n", __func__);
- return -ENOLINK;
- }
-
- return 0;
-}
-
-static void edp_sink_train_set_adjust(struct edp_ctrl *ctrl,
- const u8 *link_status)
-{
- int i;
- u8 max = 0;
- u8 data;
-
- /* use the max level across lanes */
- for (i = 0; i < ctrl->lane_cnt; i++) {
- data = drm_dp_get_adjust_request_voltage(link_status, i);
- DBG("lane=%d req_voltage_swing=0x%x", i, data);
- if (max < data)
- max = data;
- }
-
- ctrl->v_level = max >> DP_TRAIN_VOLTAGE_SWING_SHIFT;
-
- /* use the max level across lanes */
- max = 0;
- for (i = 0; i < ctrl->lane_cnt; i++) {
- data = drm_dp_get_adjust_request_pre_emphasis(link_status, i);
- DBG("lane=%d req_pre_emphasis=0x%x", i, data);
- if (max < data)
- max = data;
- }
-
- ctrl->p_level = max >> DP_TRAIN_PRE_EMPHASIS_SHIFT;
- DBG("v_level=%d, p_level=%d", ctrl->v_level, ctrl->p_level);
-}
-
-static void edp_host_train_set(struct edp_ctrl *ctrl, u32 train)
-{
- int cnt = 10;
- u32 data;
- u32 shift = train - 1;
-
- DBG("train=%d", train);
-
- edp_state_ctrl(ctrl, EDP_STATE_CTRL_TRAIN_PATTERN_1 << shift);
- while (--cnt) {
- data = edp_read(ctrl->base + REG_EDP_MAINLINK_READY);
- if (data & (EDP_MAINLINK_READY_TRAIN_PATTERN_1_READY << shift))
- break;
- }
-
- if (cnt == 0)
- pr_err("%s: set link_train=%d failed\n", __func__, train);
-}
-
-static const u8 vm_pre_emphasis[4][4] = {
- {0x03, 0x06, 0x09, 0x0C}, /* pe0, 0 db */
- {0x03, 0x06, 0x09, 0xFF}, /* pe1, 3.5 db */
- {0x03, 0x06, 0xFF, 0xFF}, /* pe2, 6.0 db */
- {0x03, 0xFF, 0xFF, 0xFF} /* pe3, 9.5 db */
-};
-
-/* voltage swing, 0.2v and 1.0v are not support */
-static const u8 vm_voltage_swing[4][4] = {
- {0x14, 0x18, 0x1A, 0x1E}, /* sw0, 0.4v */
- {0x18, 0x1A, 0x1E, 0xFF}, /* sw1, 0.6 v */
- {0x1A, 0x1E, 0xFF, 0xFF}, /* sw1, 0.8 v */
- {0x1E, 0xFF, 0xFF, 0xFF} /* sw1, 1.2 v, optional */
-};
-
-static int edp_voltage_pre_emphasise_set(struct edp_ctrl *ctrl)
-{
- u32 value0;
- u32 value1;
-
- DBG("v=%d p=%d", ctrl->v_level, ctrl->p_level);
-
- value0 = vm_pre_emphasis[(int)(ctrl->v_level)][(int)(ctrl->p_level)];
- value1 = vm_voltage_swing[(int)(ctrl->v_level)][(int)(ctrl->p_level)];
-
- /* Configure host and panel only if both values are allowed */
- if (value0 != 0xFF && value1 != 0xFF) {
- msm_edp_phy_vm_pe_cfg(ctrl->phy, value0, value1);
- return edp_lane_set_write(ctrl, ctrl->v_level, ctrl->p_level);
- }
-
- return -EINVAL;
-}
-
-static int edp_start_link_train_1(struct edp_ctrl *ctrl)
-{
- u8 link_status[DP_LINK_STATUS_SIZE];
- u8 old_v_level;
- int tries;
- int ret;
- int rlen;
-
- DBG("");
-
- edp_host_train_set(ctrl, DP_TRAINING_PATTERN_1);
- ret = edp_voltage_pre_emphasise_set(ctrl);
- if (ret)
- return ret;
- ret = edp_train_pattern_set_write(ctrl,
- DP_TRAINING_PATTERN_1 | DP_RECOVERED_CLOCK_OUT_EN);
- if (ret)
- return ret;
-
- tries = 0;
- old_v_level = ctrl->v_level;
- while (1) {
- drm_dp_link_train_clock_recovery_delay(ctrl->drm_aux, ctrl->dpcd);
-
- rlen = drm_dp_dpcd_read_link_status(ctrl->drm_aux, link_status);
- if (rlen < DP_LINK_STATUS_SIZE) {
- pr_err("%s: read link status failed\n", __func__);
- return -ENOLINK;
- }
- if (drm_dp_clock_recovery_ok(link_status, ctrl->lane_cnt)) {
- ret = 0;
- break;
- }
-
- if (ctrl->v_level == DPCD_LINK_VOLTAGE_MAX) {
- ret = -1;
- break;
- }
-
- if (old_v_level == ctrl->v_level) {
- tries++;
- if (tries >= 5) {
- ret = -1;
- break;
- }
- } else {
- tries = 0;
- old_v_level = ctrl->v_level;
- }
-
- edp_sink_train_set_adjust(ctrl, link_status);
- ret = edp_voltage_pre_emphasise_set(ctrl);
- if (ret)
- return ret;
- }
-
- return ret;
-}
-
-static int edp_start_link_train_2(struct edp_ctrl *ctrl)
-{
- u8 link_status[DP_LINK_STATUS_SIZE];
- int tries = 0;
- int ret;
- int rlen;
-
- DBG("");
-
- edp_host_train_set(ctrl, DP_TRAINING_PATTERN_2);
- ret = edp_voltage_pre_emphasise_set(ctrl);
- if (ret)
- return ret;
-
- ret = edp_train_pattern_set_write(ctrl,
- DP_TRAINING_PATTERN_2 | DP_RECOVERED_CLOCK_OUT_EN);
- if (ret)
- return ret;
-
- while (1) {
- drm_dp_link_train_channel_eq_delay(ctrl->drm_aux, ctrl->dpcd);
-
- rlen = drm_dp_dpcd_read_link_status(ctrl->drm_aux, link_status);
- if (rlen < DP_LINK_STATUS_SIZE) {
- pr_err("%s: read link status failed\n", __func__);
- return -ENOLINK;
- }
- if (drm_dp_channel_eq_ok(link_status, ctrl->lane_cnt)) {
- ret = 0;
- break;
- }
-
- tries++;
- if (tries > 10) {
- ret = -1;
- break;
- }
-
- edp_sink_train_set_adjust(ctrl, link_status);
- ret = edp_voltage_pre_emphasise_set(ctrl);
- if (ret)
- return ret;
- }
-
- return ret;
-}
-
-static int edp_link_rate_down_shift(struct edp_ctrl *ctrl)
-{
- u32 prate, lrate, bpp;
- u8 rate, lane, max_lane;
- int changed = 0;
-
- rate = ctrl->link_rate;
- lane = ctrl->lane_cnt;
- max_lane = drm_dp_max_lane_count(ctrl->dpcd);
-
- bpp = ctrl->color_depth * 3;
- prate = ctrl->pixel_rate;
- prate *= bpp;
- prate /= 8; /* in kByte */
-
- if (rate > DP_LINK_BW_1_62 && rate <= EDP_LINK_BW_MAX) {
- rate -= 4; /* reduce rate */
- changed++;
- }
-
- if (changed) {
- if (lane >= 1 && lane < max_lane)
- lane <<= 1; /* increase lane */
-
- lrate = 270000; /* in kHz */
- lrate *= rate;
- lrate /= 10; /* kByte, 10 bits --> 8 bits */
- lrate *= lane;
-
- DBG("new lrate=%u prate=%u(kHz) rate=%d lane=%d p=%u b=%d",
- lrate, prate, rate, lane,
- ctrl->pixel_rate,
- bpp);
-
- if (lrate > prate) {
- ctrl->link_rate = rate;
- ctrl->lane_cnt = lane;
- DBG("new rate=%d %d", rate, lane);
- return 0;
- }
- }
-
- return -EINVAL;
-}
-
-static int edp_clear_training_pattern(struct edp_ctrl *ctrl)
-{
- int ret;
-
- ret = edp_train_pattern_set_write(ctrl, 0);
-
- drm_dp_link_train_channel_eq_delay(ctrl->drm_aux, ctrl->dpcd);
-
- return ret;
-}
-
-static int edp_do_link_train(struct edp_ctrl *ctrl)
-{
- u8 values[2];
- int ret;
-
- DBG("");
- /*
- * Set the current link rate and lane cnt to panel. They may have been
- * adjusted and the values are different from them in DPCD CAP
- */
- values[0] = ctrl->lane_cnt;
- values[1] = ctrl->link_rate;
-
- if (drm_dp_enhanced_frame_cap(ctrl->dpcd))
- values[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
-
- if (drm_dp_dpcd_write(ctrl->drm_aux, DP_LINK_BW_SET, values,
- sizeof(values)) < 0)
- return EDP_TRAIN_FAIL;
-
- ctrl->v_level = 0; /* start from default level */
- ctrl->p_level = 0;
-
- edp_state_ctrl(ctrl, 0);
- if (edp_clear_training_pattern(ctrl))
- return EDP_TRAIN_FAIL;
-
- ret = edp_start_link_train_1(ctrl);
- if (ret < 0) {
- if (edp_link_rate_down_shift(ctrl) == 0) {
- DBG("link reconfig");
- ret = EDP_TRAIN_RECONFIG;
- goto clear;
- } else {
- pr_err("%s: Training 1 failed", __func__);
- ret = EDP_TRAIN_FAIL;
- goto clear;
- }
- }
- DBG("Training 1 completed successfully");
-
- edp_state_ctrl(ctrl, 0);
- if (edp_clear_training_pattern(ctrl))
- return EDP_TRAIN_FAIL;
-
- ret = edp_start_link_train_2(ctrl);
- if (ret < 0) {
- if (edp_link_rate_down_shift(ctrl) == 0) {
- DBG("link reconfig");
- ret = EDP_TRAIN_RECONFIG;
- goto clear;
- } else {
- pr_err("%s: Training 2 failed", __func__);
- ret = EDP_TRAIN_FAIL;
- goto clear;
- }
- }
- DBG("Training 2 completed successfully");
-
- edp_state_ctrl(ctrl, EDP_STATE_CTRL_SEND_VIDEO);
-clear:
- edp_clear_training_pattern(ctrl);
-
- return ret;
-}
-
-static void edp_clock_synchrous(struct edp_ctrl *ctrl, int sync)
-{
- u32 data;
- enum edp_color_depth depth;
-
- data = edp_read(ctrl->base + REG_EDP_MISC1_MISC0);
-
- if (sync)
- data |= EDP_MISC1_MISC0_SYNC;
- else
- data &= ~EDP_MISC1_MISC0_SYNC;
-
- /* only legacy rgb mode supported */
- depth = EDP_6BIT; /* Default */
- if (ctrl->color_depth == 8)
- depth = EDP_8BIT;
- else if (ctrl->color_depth == 10)
- depth = EDP_10BIT;
- else if (ctrl->color_depth == 12)
- depth = EDP_12BIT;
- else if (ctrl->color_depth == 16)
- depth = EDP_16BIT;
-
- data |= EDP_MISC1_MISC0_COLOR(depth);
-
- edp_write(ctrl->base + REG_EDP_MISC1_MISC0, data);
-}
-
-static int edp_sw_mvid_nvid(struct edp_ctrl *ctrl, u32 m, u32 n)
-{
- u32 n_multi, m_multi = 5;
-
- if (ctrl->link_rate == DP_LINK_BW_1_62) {
- n_multi = 1;
- } else if (ctrl->link_rate == DP_LINK_BW_2_7) {
- n_multi = 2;
- } else {
- pr_err("%s: Invalid link rate, %d\n", __func__,
- ctrl->link_rate);
- return -EINVAL;
- }
-
- edp_write(ctrl->base + REG_EDP_SOFTWARE_MVID, m * m_multi);
- edp_write(ctrl->base + REG_EDP_SOFTWARE_NVID, n * n_multi);
-
- return 0;
-}
-
-static void edp_mainlink_ctrl(struct edp_ctrl *ctrl, int enable)
-{
- u32 data = 0;
-
- edp_write(ctrl->base + REG_EDP_MAINLINK_CTRL, EDP_MAINLINK_CTRL_RESET);
- /* Make sure fully reset */
- wmb();
- usleep_range(500, 1000);
-
- if (enable)
- data |= EDP_MAINLINK_CTRL_ENABLE;
-
- edp_write(ctrl->base + REG_EDP_MAINLINK_CTRL, data);
-}
-
-static void edp_ctrl_phy_aux_enable(struct edp_ctrl *ctrl, int enable)
-{
- if (enable) {
- edp_regulator_enable(ctrl);
- edp_clk_enable(ctrl, EDP_CLK_MASK_AUX_CHAN);
- msm_edp_phy_ctrl(ctrl->phy, 1);
- msm_edp_aux_ctrl(ctrl->aux, 1);
- gpiod_set_value(ctrl->panel_en_gpio, 1);
- } else {
- gpiod_set_value(ctrl->panel_en_gpio, 0);
- msm_edp_aux_ctrl(ctrl->aux, 0);
- msm_edp_phy_ctrl(ctrl->phy, 0);
- edp_clk_disable(ctrl, EDP_CLK_MASK_AUX_CHAN);
- edp_regulator_disable(ctrl);
- }
-}
-
-static void edp_ctrl_link_enable(struct edp_ctrl *ctrl, int enable)
-{
- u32 m, n;
-
- if (enable) {
- /* Enable link channel clocks */
- edp_clk_enable(ctrl, EDP_CLK_MASK_LINK_CHAN);
-
- msm_edp_phy_lane_power_ctrl(ctrl->phy, true, ctrl->lane_cnt);
-
- msm_edp_phy_vm_pe_init(ctrl->phy);
-
- /* Make sure phy is programed */
- wmb();
- msm_edp_phy_ready(ctrl->phy);
-
- edp_config_ctrl(ctrl);
- msm_edp_ctrl_pixel_clock_valid(ctrl, ctrl->pixel_rate, &m, &n);
- edp_sw_mvid_nvid(ctrl, m, n);
- edp_mainlink_ctrl(ctrl, 1);
- } else {
- edp_mainlink_ctrl(ctrl, 0);
-
- msm_edp_phy_lane_power_ctrl(ctrl->phy, false, 0);
- edp_clk_disable(ctrl, EDP_CLK_MASK_LINK_CHAN);
- }
-}
-
-static int edp_ctrl_training(struct edp_ctrl *ctrl)
-{
- int ret;
-
- /* Do link training only when power is on */
- if (!ctrl->power_on)
- return -EINVAL;
-
-train_start:
- ret = edp_do_link_train(ctrl);
- if (ret == EDP_TRAIN_RECONFIG) {
- /* Re-configure main link */
- edp_ctrl_irq_enable(ctrl, 0);
- edp_ctrl_link_enable(ctrl, 0);
- msm_edp_phy_ctrl(ctrl->phy, 0);
-
- /* Make sure link is fully disabled */
- wmb();
- usleep_range(500, 1000);
-
- msm_edp_phy_ctrl(ctrl->phy, 1);
- edp_ctrl_link_enable(ctrl, 1);
- edp_ctrl_irq_enable(ctrl, 1);
- goto train_start;
- }
-
- return ret;
-}
-
-static void edp_ctrl_on_worker(struct work_struct *work)
-{
- struct edp_ctrl *ctrl = container_of(
- work, struct edp_ctrl, on_work);
- u8 value;
- int ret;
-
- mutex_lock(&ctrl->dev_mutex);
-
- if (ctrl->power_on) {
- DBG("already on");
- goto unlock_ret;
- }
-
- edp_ctrl_phy_aux_enable(ctrl, 1);
- edp_ctrl_link_enable(ctrl, 1);
-
- edp_ctrl_irq_enable(ctrl, 1);
-
- /* DP_SET_POWER register is only available on DPCD v1.1 and later */
- if (ctrl->dpcd[DP_DPCD_REV] >= 0x11) {
- ret = drm_dp_dpcd_readb(ctrl->drm_aux, DP_SET_POWER, &value);
- if (ret < 0)
- goto fail;
-
- value &= ~DP_SET_POWER_MASK;
- value |= DP_SET_POWER_D0;
-
- ret = drm_dp_dpcd_writeb(ctrl->drm_aux, DP_SET_POWER, value);
- if (ret < 0)
- goto fail;
-
- /*
- * According to the DP 1.1 specification, a "Sink Device must
- * exit the power saving state within 1 ms" (Section 2.5.3.1,
- * Table 5-52, "Sink Control Field" (register 0x600).
- */
- usleep_range(1000, 2000);
- }
-
- ctrl->power_on = true;
-
- /* Start link training */
- ret = edp_ctrl_training(ctrl);
- if (ret != EDP_TRAIN_SUCCESS)
- goto fail;
-
- DBG("DONE");
- goto unlock_ret;
-
-fail:
- edp_ctrl_irq_enable(ctrl, 0);
- edp_ctrl_link_enable(ctrl, 0);
- edp_ctrl_phy_aux_enable(ctrl, 0);
- ctrl->power_on = false;
-unlock_ret:
- mutex_unlock(&ctrl->dev_mutex);
-}
-
-static void edp_ctrl_off_worker(struct work_struct *work)
-{
- struct edp_ctrl *ctrl = container_of(
- work, struct edp_ctrl, off_work);
- unsigned long time_left;
-
- mutex_lock(&ctrl->dev_mutex);
-
- if (!ctrl->power_on) {
- DBG("already off");
- goto unlock_ret;
- }
-
- reinit_completion(&ctrl->idle_comp);
- edp_state_ctrl(ctrl, EDP_STATE_CTRL_PUSH_IDLE);
-
- time_left = wait_for_completion_timeout(&ctrl->idle_comp,
- msecs_to_jiffies(500));
- if (!time_left)
- DBG("%s: idle pattern timedout\n", __func__);
-
- edp_state_ctrl(ctrl, 0);
-
- /* DP_SET_POWER register is only available on DPCD v1.1 and later */
- if (ctrl->dpcd[DP_DPCD_REV] >= 0x11) {
- u8 value;
- int ret;
-
- ret = drm_dp_dpcd_readb(ctrl->drm_aux, DP_SET_POWER, &value);
- if (ret > 0) {
- value &= ~DP_SET_POWER_MASK;
- value |= DP_SET_POWER_D3;
-
- drm_dp_dpcd_writeb(ctrl->drm_aux, DP_SET_POWER, value);
- }
- }
-
- edp_ctrl_irq_enable(ctrl, 0);
-
- edp_ctrl_link_enable(ctrl, 0);
-
- edp_ctrl_phy_aux_enable(ctrl, 0);
-
- ctrl->power_on = false;
-
-unlock_ret:
- mutex_unlock(&ctrl->dev_mutex);
-}
-
-irqreturn_t msm_edp_ctrl_irq(struct edp_ctrl *ctrl)
-{
- u32 isr1, isr2, mask1, mask2;
- u32 ack;
-
- DBG("");
- spin_lock(&ctrl->irq_lock);
- isr1 = edp_read(ctrl->base + REG_EDP_INTERRUPT_REG_1);
- isr2 = edp_read(ctrl->base + REG_EDP_INTERRUPT_REG_2);
-
- mask1 = isr1 & EDP_INTR_MASK1;
- mask2 = isr2 & EDP_INTR_MASK2;
-
- isr1 &= ~mask1; /* remove masks bit */
- isr2 &= ~mask2;
-
- DBG("isr=%x mask=%x isr2=%x mask2=%x",
- isr1, mask1, isr2, mask2);
-
- ack = isr1 & EDP_INTR_STATUS1;
- ack <<= 1; /* ack bits */
- ack |= mask1;
- edp_write(ctrl->base + REG_EDP_INTERRUPT_REG_1, ack);
-
- ack = isr2 & EDP_INTR_STATUS2;
- ack <<= 1; /* ack bits */
- ack |= mask2;
- edp_write(ctrl->base + REG_EDP_INTERRUPT_REG_2, ack);
- spin_unlock(&ctrl->irq_lock);
-
- if (isr1 & EDP_INTERRUPT_REG_1_HPD)
- DBG("edp_hpd");
-
- if (isr2 & EDP_INTERRUPT_REG_2_READY_FOR_VIDEO)
- DBG("edp_video_ready");
-
- if (isr2 & EDP_INTERRUPT_REG_2_IDLE_PATTERNs_SENT) {
- DBG("idle_patterns_sent");
- complete(&ctrl->idle_comp);
- }
-
- msm_edp_aux_irq(ctrl->aux, isr1);
-
- return IRQ_HANDLED;
-}
-
-void msm_edp_ctrl_power(struct edp_ctrl *ctrl, bool on)
-{
- if (on)
- queue_work(ctrl->workqueue, &ctrl->on_work);
- else
- queue_work(ctrl->workqueue, &ctrl->off_work);
-}
-
-int msm_edp_ctrl_init(struct msm_edp *edp)
-{
- struct edp_ctrl *ctrl = NULL;
- struct device *dev;
- int ret;
-
- if (!edp) {
- pr_err("%s: edp is NULL!\n", __func__);
- return -EINVAL;
- }
-
- dev = &edp->pdev->dev;
- ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL);
- if (!ctrl)
- return -ENOMEM;
-
- edp->ctrl = ctrl;
- ctrl->pdev = edp->pdev;
-
- ctrl->base = msm_ioremap(ctrl->pdev, "edp", "eDP");
- if (IS_ERR(ctrl->base))
- return PTR_ERR(ctrl->base);
-
- /* Get regulator, clock, gpio, pwm */
- ret = edp_regulator_init(ctrl);
- if (ret) {
- pr_err("%s:regulator init fail\n", __func__);
- return ret;
- }
- ret = edp_clk_init(ctrl);
- if (ret) {
- pr_err("%s:clk init fail\n", __func__);
- return ret;
- }
- ret = edp_gpio_config(ctrl);
- if (ret) {
- pr_err("%s:failed to configure GPIOs: %d", __func__, ret);
- return ret;
- }
-
- /* Init aux and phy */
- ctrl->aux = msm_edp_aux_init(edp, ctrl->base, &ctrl->drm_aux);
- if (!ctrl->aux || !ctrl->drm_aux) {
- pr_err("%s:failed to init aux\n", __func__);
- return -ENOMEM;
- }
-
- ctrl->phy = msm_edp_phy_init(dev, ctrl->base);
- if (!ctrl->phy) {
- pr_err("%s:failed to init phy\n", __func__);
- ret = -ENOMEM;
- goto err_destory_aux;
- }
-
- spin_lock_init(&ctrl->irq_lock);
- mutex_init(&ctrl->dev_mutex);
- init_completion(&ctrl->idle_comp);
-
- /* setup workqueue */
- ctrl->workqueue = alloc_ordered_workqueue("edp_drm_work", 0);
- INIT_WORK(&ctrl->on_work, edp_ctrl_on_worker);
- INIT_WORK(&ctrl->off_work, edp_ctrl_off_worker);
-
- return 0;
-
-err_destory_aux:
- msm_edp_aux_destroy(dev, ctrl->aux);
- ctrl->aux = NULL;
- return ret;
-}
-
-void msm_edp_ctrl_destroy(struct edp_ctrl *ctrl)
-{
- if (!ctrl)
- return;
-
- if (ctrl->workqueue) {
- destroy_workqueue(ctrl->workqueue);
- ctrl->workqueue = NULL;
- }
-
- if (ctrl->aux) {
- msm_edp_aux_destroy(&ctrl->pdev->dev, ctrl->aux);
- ctrl->aux = NULL;
- }
-
- kfree(ctrl->edid);
- ctrl->edid = NULL;
-
- mutex_destroy(&ctrl->dev_mutex);
-}
-
-bool msm_edp_ctrl_panel_connected(struct edp_ctrl *ctrl)
-{
- mutex_lock(&ctrl->dev_mutex);
- DBG("connect status = %d", ctrl->edp_connected);
- if (ctrl->edp_connected) {
- mutex_unlock(&ctrl->dev_mutex);
- return true;
- }
-
- if (!ctrl->power_on) {
- edp_ctrl_phy_aux_enable(ctrl, 1);
- edp_ctrl_irq_enable(ctrl, 1);
- }
-
- if (drm_dp_dpcd_read(ctrl->drm_aux, DP_DPCD_REV, ctrl->dpcd,
- DP_RECEIVER_CAP_SIZE) < DP_RECEIVER_CAP_SIZE) {
- pr_err("%s: AUX channel is NOT ready\n", __func__);
- memset(ctrl->dpcd, 0, DP_RECEIVER_CAP_SIZE);
- } else {
- ctrl->edp_connected = true;
- }
-
- if (!ctrl->power_on) {
- edp_ctrl_irq_enable(ctrl, 0);
- edp_ctrl_phy_aux_enable(ctrl, 0);
- }
-
- DBG("exit: connect status=%d", ctrl->edp_connected);
-
- mutex_unlock(&ctrl->dev_mutex);
-
- return ctrl->edp_connected;
-}
-
-int msm_edp_ctrl_get_panel_info(struct edp_ctrl *ctrl,
- struct drm_connector *connector, struct edid **edid)
-{
- mutex_lock(&ctrl->dev_mutex);
-
- if (ctrl->edid) {
- if (edid) {
- DBG("Just return edid buffer");
- *edid = ctrl->edid;
- }
- goto unlock_ret;
- }
-
- if (!ctrl->power_on) {
- edp_ctrl_phy_aux_enable(ctrl, 1);
- edp_ctrl_irq_enable(ctrl, 1);
- }
-
- /* Initialize link rate as panel max link rate */
- ctrl->link_rate = ctrl->dpcd[DP_MAX_LINK_RATE];
-
- ctrl->edid = drm_get_edid(connector, &ctrl->drm_aux->ddc);
- if (!ctrl->edid) {
- pr_err("%s: edid read fail\n", __func__);
- goto disable_ret;
- }
-
- if (edid)
- *edid = ctrl->edid;
-
-disable_ret:
- if (!ctrl->power_on) {
- edp_ctrl_irq_enable(ctrl, 0);
- edp_ctrl_phy_aux_enable(ctrl, 0);
- }
-unlock_ret:
- mutex_unlock(&ctrl->dev_mutex);
- return 0;
-}
-
-int msm_edp_ctrl_timing_cfg(struct edp_ctrl *ctrl,
- const struct drm_display_mode *mode,
- const struct drm_display_info *info)
-{
- u32 hstart_from_sync, vstart_from_sync;
- u32 data;
- int ret = 0;
-
- mutex_lock(&ctrl->dev_mutex);
- /*
- * Need to keep color depth, pixel rate and
- * interlaced information in ctrl context
- */
- ctrl->color_depth = info->bpc;
- ctrl->pixel_rate = mode->clock;
- ctrl->interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
-
- /* Fill initial link config based on passed in timing */
- edp_fill_link_cfg(ctrl);
-
- if (edp_clk_enable(ctrl, EDP_CLK_MASK_AHB)) {
- pr_err("%s, fail to prepare enable ahb clk\n", __func__);
- ret = -EINVAL;
- goto unlock_ret;
- }
- edp_clock_synchrous(ctrl, 1);
-
- /* Configure eDP timing to HW */
- edp_write(ctrl->base + REG_EDP_TOTAL_HOR_VER,
- EDP_TOTAL_HOR_VER_HORIZ(mode->htotal) |
- EDP_TOTAL_HOR_VER_VERT(mode->vtotal));
-
- vstart_from_sync = mode->vtotal - mode->vsync_start;
- hstart_from_sync = mode->htotal - mode->hsync_start;
- edp_write(ctrl->base + REG_EDP_START_HOR_VER_FROM_SYNC,
- EDP_START_HOR_VER_FROM_SYNC_HORIZ(hstart_from_sync) |
- EDP_START_HOR_VER_FROM_SYNC_VERT(vstart_from_sync));
-
- data = EDP_HSYNC_VSYNC_WIDTH_POLARITY_VERT(
- mode->vsync_end - mode->vsync_start);
- data |= EDP_HSYNC_VSYNC_WIDTH_POLARITY_HORIZ(
- mode->hsync_end - mode->hsync_start);
- if (mode->flags & DRM_MODE_FLAG_NVSYNC)
- data |= EDP_HSYNC_VSYNC_WIDTH_POLARITY_NVSYNC;
- if (mode->flags & DRM_MODE_FLAG_NHSYNC)
- data |= EDP_HSYNC_VSYNC_WIDTH_POLARITY_NHSYNC;
- edp_write(ctrl->base + REG_EDP_HSYNC_VSYNC_WIDTH_POLARITY, data);
-
- edp_write(ctrl->base + REG_EDP_ACTIVE_HOR_VER,
- EDP_ACTIVE_HOR_VER_HORIZ(mode->hdisplay) |
- EDP_ACTIVE_HOR_VER_VERT(mode->vdisplay));
-
- edp_clk_disable(ctrl, EDP_CLK_MASK_AHB);
-
-unlock_ret:
- mutex_unlock(&ctrl->dev_mutex);
- return ret;
-}
-
-bool msm_edp_ctrl_pixel_clock_valid(struct edp_ctrl *ctrl,
- u32 pixel_rate, u32 *pm, u32 *pn)
-{
- const struct edp_pixel_clk_div *divs;
- u32 err = 1; /* 1% error tolerance */
- u32 clk_err;
- int i;
-
- if (ctrl->link_rate == DP_LINK_BW_1_62) {
- divs = clk_divs[0];
- } else if (ctrl->link_rate == DP_LINK_BW_2_7) {
- divs = clk_divs[1];
- } else {
- pr_err("%s: Invalid link rate,%d\n", __func__, ctrl->link_rate);
- return false;
- }
-
- for (i = 0; i < EDP_PIXEL_CLK_NUM; i++) {
- clk_err = abs(divs[i].rate - pixel_rate);
- if ((divs[i].rate * err / 100) >= clk_err) {
- if (pm)
- *pm = divs[i].m;
- if (pn)
- *pn = divs[i].n;
- return true;
- }
- }
-
- DBG("pixel clock %d(kHz) not supported", pixel_rate);
-
- return false;
-}
-
projects / platform / kernel / linux-rpi.git / commitdiff