drm/i915: Add correct hw/sw config check for DSI encoder

Check in vlv_crtc_clock_get if DPLL is enabled before calling dpio read.
It will not be enabled for DSI and avoid dpio read WARN dumps.

Absence of ->get_config was causing other WARN dumps as well. Update
dpll_hw_state as well correctly

v2: Address review comments by Daniel
    - Check if DPLL is enabled rather than checking pipe output type
    - set adjusted_mode->flags to 0 in compute_config rather than using
      pipe_config->quirks
    - Add helper function in intel_dsi_pll.c and use that in intel_dsi.c
    - updated dpll_hw_state correctly
    - Updated commit message and title

v3: Address review comments by Imre
    - Proper masking of P1, M1 fields while computing divisors
    - assert in case of bpp mismatch
    - guard for divide by 0 while computing pclk
    - Use ARRAY_SIZE instead of direct calculation

Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 99eb7ca..018fb72 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6161,6 +6161,10 @@ static void vlv_crtc_clock_get(struct intel_crtc *crtc,
        u32 mdiv;
        int refclk = 100000;
 
+       /* In case of MIPI DPLL will not even be used */
+       if (!(pipe_config->dpll_hw_state.dpll & DPLL_VCO_ENABLE))
+               return;
+
        mutex_lock(&dev_priv->dpio_lock);
        mdiv = vlv_dpio_read(dev_priv, pipe, VLV_PLL_DW3(pipe));
        mutex_unlock(&dev_priv->dpio_lock);

diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index 09e1caf..670c29a 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -92,6 +92,9 @@ static bool intel_dsi_compute_config(struct intel_encoder *encoder,
        if (fixed_mode)
                intel_fixed_panel_mode(fixed_mode, adjusted_mode);
 
+       /* DSI uses short packets for sync events, so clear mode flags for DSI */
+       adjusted_mode->flags = 0;
+
        if (intel_dsi->dev.dev_ops->mode_fixup)
                return intel_dsi->dev.dev_ops->mode_fixup(&intel_dsi->dev,
                                                          mode, adjusted_mode);
@@ -179,6 +182,10 @@ static void intel_dsi_pre_enable(struct intel_encoder *encoder)
        tmp |= DPLL_REFA_CLK_ENABLE_VLV;
        I915_WRITE(DPLL(pipe), tmp);
 
+       /* update the hw state for DPLL */
+       intel_crtc->config.dpll_hw_state.dpll = DPLL_INTEGRATED_CLOCK_VLV |
+                                               DPLL_REFA_CLK_ENABLE_VLV;
+
        tmp = I915_READ(DSPCLK_GATE_D);
        tmp |= DPOUNIT_CLOCK_GATE_DISABLE;
        I915_WRITE(DSPCLK_GATE_D, tmp);
@@ -359,9 +366,21 @@ static bool intel_dsi_get_hw_state(struct intel_encoder *encoder,
 static void intel_dsi_get_config(struct intel_encoder *encoder,
                                 struct intel_crtc_config *pipe_config)
 {
+       u32 pclk;
        DRM_DEBUG_KMS("\n");
 
-       /* XXX: read flags, set to adjusted_mode */
+       /*
+        * DPLL_MD is not used in case of DSI, reading will get some default value
+        * set dpll_md = 0
+        */
+       pipe_config->dpll_hw_state.dpll_md = 0;
+
+       pclk = vlv_get_dsi_pclk(encoder, pipe_config->pipe_bpp);
+       if (!pclk)
+               return;
+
+       pipe_config->adjusted_mode.crtc_clock = pclk;
+       pipe_config->port_clock = pclk;
 }
 
 static enum drm_mode_status

diff --git a/drivers/gpu/drm/i915/intel_dsi.h b/drivers/gpu/drm/i915/intel_dsi.h
index 31db33d..fd51867 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dsi.h
+++ b/drivers/gpu/drm/i915/intel_dsi.h
@@ -132,6 +132,7 @@ static inline struct intel_dsi *enc_to_intel_dsi(struct drm_encoder *encoder)
 
 extern void vlv_enable_dsi_pll(struct intel_encoder *encoder);
 extern void vlv_disable_dsi_pll(struct intel_encoder *encoder);
+extern u32 vlv_get_dsi_pclk(struct intel_encoder *encoder, int pipe_bpp);
 
 extern struct intel_dsi_dev_ops vbt_generic_dsi_display_ops;
 

diff --git a/drivers/gpu/drm/i915/intel_dsi_pll.c b/drivers/gpu/drm/i915/intel_dsi_pll.c
index ba79ec1..d8bb1ea 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dsi_pll.c
+++ b/drivers/gpu/drm/i915/intel_dsi_pll.c
@@ -298,3 +298,84 @@ void vlv_disable_dsi_pll(struct intel_encoder *encoder)
 
        mutex_unlock(&dev_priv->dpio_lock);
 }
+
+static void assert_bpp_mismatch(int pixel_format, int pipe_bpp)
+{
+       int bpp;
+
+       switch (pixel_format) {
+       default:
+       case VID_MODE_FORMAT_RGB888:
+       case VID_MODE_FORMAT_RGB666_LOOSE:
+               bpp = 24;
+               break;
+       case VID_MODE_FORMAT_RGB666:
+               bpp = 18;
+               break;
+       case VID_MODE_FORMAT_RGB565:
+               bpp = 16;
+               break;
+       }
+
+       WARN(bpp != pipe_bpp,
+               "bpp match assertion failure (expected %d, current %d)\n",
+               bpp, pipe_bpp);
+}
+
+u32 vlv_get_dsi_pclk(struct intel_encoder *encoder, int pipe_bpp)
+{
+       struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
+       struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
+       u32 dsi_clock, pclk;
+       u32 pll_ctl, pll_div;
+       u32 m = 0, p = 0;
+       int refclk = 25000;
+       int i;
+
+       DRM_DEBUG_KMS("\n");
+
+       mutex_lock(&dev_priv->dpio_lock);
+       pll_ctl = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL);
+       pll_div = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_DIVIDER);
+       mutex_unlock(&dev_priv->dpio_lock);
+
+       /* mask out other bits and extract the P1 divisor */
+       pll_ctl &= DSI_PLL_P1_POST_DIV_MASK;
+       pll_ctl = pll_ctl >> (DSI_PLL_P1_POST_DIV_SHIFT - 2);
+
+       /* mask out the other bits and extract the M1 divisor */
+       pll_div &= DSI_PLL_M1_DIV_MASK;
+       pll_div = pll_div >> DSI_PLL_M1_DIV_SHIFT;
+
+       while (pll_ctl) {
+               pll_ctl = pll_ctl >> 1;
+               p++;
+       }
+       p--;
+
+       if (!p) {
+               DRM_ERROR("wrong P1 divisor\n");
+               return 0;
+       }
+
+       for (i = 0; i < ARRAY_SIZE(lfsr_converts); i++) {
+               if (lfsr_converts[i] == pll_div)
+                       break;
+       }
+
+       if (i == ARRAY_SIZE(lfsr_converts)) {
+               DRM_ERROR("wrong m_seed programmed\n");
+               return 0;
+       }
+
+       m = i + 62;
+
+       dsi_clock = (m * refclk) / p;
+
+       /* pixel_format and pipe_bpp should agree */
+       assert_bpp_mismatch(intel_dsi->pixel_format, pipe_bpp);
+
+       pclk = DIV_ROUND_CLOSEST(dsi_clock * intel_dsi->lane_count, pipe_bpp);
+
+       return pclk;
+}