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drm/i915/cnp: Wa 1181: Fix Backlight issue 

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@intel.com>
Cc: Arthur J Runyan <arthur.j.runyan@intel.com>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170831045223.3960-1-rodrigo.vivi@intel.com
This commit is contained in:
Rodrigo Vivi 2017-08-30 21:52:23 -07:00
parent 908a610557
commit 0a46ddd57c
2 changed files with 26 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/i915/i915_reg.h
View File

@ -7483,6 +7483,7 @@ 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 */

27
drivers/gpu/drm/i915/intel_pm.c
View File

@ -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;