drm/i915: Work around DISPLAY_PHY_CONTROL register corruption on CHV

Sometimes (exactly when is a bit unclear) DISPLAY_PHY_CONTROL appears to
get corrupted. The values I've managed to read from it seem to have some
pattern but vary quite a lot. The corruption doesn't seem to just happen
when the register is accessed, but can also happen spontaneosly during
modeset. When this happens during a modeset things go south and the
display doesn't light up.

I've managed to hit the problemn when toggling HDMI on port D on and
off. When things get corrupted the display doesn't light up, but as soon
as I manually write the correct value to the register the display comes
up.

First I was suspicious that we ourselves accidentally overwrite it with
garbage, but didn't catch anything with the reg_rw tracepoint. Also I
sprinkled check all over the modeset path to see exactly when the
corruption happens, and eg. the read back value was fine just before
intel_dp_set_m(), and corrupted immediately after it. I also made my
check function repair the register value whenever it was wrong, and with
this approach the corruption repeated several times during the modeset
operation, always seeming to trigger in the same exact calls to the
check function, while other calls to the function never caught anything.

So far I've not seen this problem occurring when carefully avoiding all
read accesses to DISPLAY_PHY_CONTROL. Not sure if that's just pure luck
or an actual workaround, but we can hope it works. So let's avoid reading
the register and instead track the desired value of the register in dev_priv.

v2: Read out the power well state to determine initial register value
v3: Use DPIO_CHx names instead of raw numbers

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by:  Deepak S <deepak.s@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 31 insertions, 5 deletions

diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index bd7ad1d2d5f5..3d7352577bdc 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -949,8 +949,8 @@ static void chv_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv,
 	if (wait_for(I915_READ(DISPLAY_PHY_STATUS) & PHY_POWERGOOD(phy), 1))
 		DRM_ERROR("Display PHY %d is not power up\n", phy);
 
-	I915_WRITE(DISPLAY_PHY_CONTROL, I915_READ(DISPLAY_PHY_CONTROL) |
-		   PHY_COM_LANE_RESET_DEASSERT(phy));
+	dev_priv->chv_phy_control |= PHY_COM_LANE_RESET_DEASSERT(phy);
+	I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control);
 }
 
 static void chv_dpio_cmn_power_well_disable(struct drm_i915_private *dev_priv,
@@ -970,8 +970,8 @@ static void chv_dpio_cmn_power_well_disable(struct drm_i915_private *dev_priv,
 		assert_pll_disabled(dev_priv, PIPE_C);
 	}
 
-	I915_WRITE(DISPLAY_PHY_CONTROL, I915_READ(DISPLAY_PHY_CONTROL) &
-		   ~PHY_COM_LANE_RESET_DEASSERT(phy));
+	dev_priv->chv_phy_control &= ~PHY_COM_LANE_RESET_DEASSERT(phy);
+	I915_WRITE(DISPLAY_PHY_CONTROL, dev_priv->chv_phy_control);
 
 	vlv_set_power_well(dev_priv, power_well, false);
 }
@@ -1719,6 +1719,30 @@ static void intel_power_domains_resume(struct drm_i915_private *dev_priv)
 	mutex_unlock(&power_domains->lock);
 }
 
+static void chv_phy_control_init(struct drm_i915_private *dev_priv)
+{
+	struct i915_power_well *cmn_bc =
+		lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_BC);
+	struct i915_power_well *cmn_d =
+		lookup_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_D);
+
+	/*
+	 * DISPLAY_PHY_CONTROL can get corrupted if read. As a
+	 * workaround never ever read DISPLAY_PHY_CONTROL, and
+	 * instead maintain a shadow copy ourselves. Use the actual
+	 * power well state to reconstruct the expected initial
+	 * value.
+	 */
+	dev_priv->chv_phy_control =
+		PHY_CH_POWER_MODE(PHY_CH_SU_PSR, DPIO_PHY0, DPIO_CH0) |
+		PHY_CH_POWER_MODE(PHY_CH_SU_PSR, DPIO_PHY0, DPIO_CH1) |
+		PHY_CH_POWER_MODE(PHY_CH_SU_PSR, DPIO_PHY1, DPIO_CH0);
+	if (cmn_bc->ops->is_enabled(dev_priv, cmn_bc))
+		dev_priv->chv_phy_control |= PHY_COM_LANE_RESET_DEASSERT(DPIO_PHY0);
+	if (cmn_d->ops->is_enabled(dev_priv, cmn_d))
+		dev_priv->chv_phy_control |= PHY_COM_LANE_RESET_DEASSERT(DPIO_PHY1);
+}
+
 static void vlv_cmnlane_wa(struct drm_i915_private *dev_priv)
 {
 	struct i915_power_well *cmn =
@@ -1761,7 +1785,9 @@ void intel_power_domains_init_hw(struct drm_i915_private *dev_priv)
 
 	power_domains->initializing = true;
 
-	if (IS_VALLEYVIEW(dev) && !IS_CHERRYVIEW(dev)) {
+	if (IS_CHERRYVIEW(dev)) {
+		chv_phy_control_init(dev_priv);
+	} else if (IS_VALLEYVIEW(dev)) {
 		mutex_lock(&power_domains->lock);
 		vlv_cmnlane_wa(dev_priv);
 		mutex_unlock(&power_domains->lock);