From: "Vivi, Rodrigo" <rodrigo.vivi@xxxxxxxxx>
This workaround fixes a CNL PCH bug when changing
backlight from a lower frequency to a higher frequency.
During random reboot cycles, display backlight seems to
be off/ dim for 2-3 mins.
The only functional change on this patch is to
set bit 13 of 0xC2020 for CNL PCH.
The rest of patch is organizing identation around
those bits definitions and re-organizing CFL workarounds.
v2: Only add the bit that matters without touching others
around (Jani).
Rebase on top of clock gating functions rename.
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Cc: Arthur J Runyan <arthur.j.runyan@xxxxxxxxx>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 1 +
drivers/gpu/drm/i915/intel_pm.c | 27 +++++++++++++++++++++++++--
2 files changed, 26 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index e2908ae34004..bb3df56e447f 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7482,6 +7482,7 @@ enum {
#define PCH_DPLUNIT_CLOCK_GATE_DISABLE (1<<30)
#define PCH_DPLSUNIT_CLOCK_GATE_DISABLE (1<<29)
#define PCH_CPUNIT_CLOCK_GATE_DISABLE (1<<14)
+#define CNP_PWM_CGE_GATING_DISABLE (1<<13)
#define PCH_LP_PARTITION_LEVEL_DISABLE (1<<12)
/* CPU: FDI_TX */
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 4bdf1fb1df7e..3473b327519d 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -8264,8 +8264,19 @@ static void gen8_set_l3sqc_credits(struct drm_i915_private *dev_priv,
I915_WRITE(GEN7_MISCCPCTL, misccpctl);
}
+static void cnp_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+ if (!HAS_PCH_CNP(dev_priv))
+ return;
+
+ /* Wa #1181 */
+ I915_WRITE(SOUTH_DSPCLK_GATE_D, CNP_PWM_CGE_GATING_DISABLE);
+}
+
static void cnl_init_clock_gating(struct drm_i915_private *dev_priv)
{
+ cnp_init_clock_gating(dev_priv);
+
/* This is not an Wa. Enable for better image quality */
I915_WRITE(_3D_CHICKEN3,
_MASKED_BIT_ENABLE(_3D_CHICKEN3_AA_LINE_QUALITY_FIX_ENABLE));
@@ -8285,6 +8296,16 @@ static void cnl_init_clock_gating(struct drm_i915_private *dev_priv)
SARBUNIT_CLKGATE_DIS);
}
+static void cfl_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+ cnp_init_clock_gating(dev_priv);
+ gen9_init_clock_gating(dev_priv);
+
+ /* WaFbcNukeOnHostModify:cfl */
+ I915_WRITE(ILK_DPFC_CHICKEN, I915_READ(ILK_DPFC_CHICKEN) |
+ ILK_DPFC_NUKE_ON_ANY_MODIFICATION);
+}
+
static void kbl_init_clock_gating(struct drm_i915_private *dev_priv)
{
gen9_init_clock_gating(dev_priv);
@@ -8299,7 +8320,7 @@ static void kbl_init_clock_gating(struct drm_i915_private *dev_priv)
I915_WRITE(GEN6_UCGCTL1, I915_READ(GEN6_UCGCTL1) |
GEN6_GAMUNIT_CLOCK_GATE_DISABLE);
- /* WaFbcNukeOnHostModify:kbl,cfl */
+ /* WaFbcNukeOnHostModify:kbl */
I915_WRITE(ILK_DPFC_CHICKEN, I915_READ(ILK_DPFC_CHICKEN) |
ILK_DPFC_NUKE_ON_ANY_MODIFICATION);
}
@@ -8767,9 +8788,11 @@ void intel_init_clock_gating_hooks(struct drm_i915_private *dev_priv)
{
if (IS_CANNONLAKE(dev_priv))
dev_priv->display.init_clock_gating = cnl_init_clock_gating;
+ else if (IS_COFFEELAKE(dev_priv))
+ dev_priv->display.init_clock_gating = cfl_init_clock_gating;
else if (IS_SKYLAKE(dev_priv))
dev_priv->display.init_clock_gating = skl_init_clock_gating;
- else if (IS_KABYLAKE(dev_priv) || IS_COFFEELAKE(dev_priv))
+ else if (IS_KABYLAKE(dev_priv))
dev_priv->display.init_clock_gating = kbl_init_clock_gating;
else if (IS_BROXTON(dev_priv))
dev_priv->display.init_clock_gating = bxt_init_clock_gating;
--
2.13.2
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