From 0a46ddd57c9ef9fb5376d4bff65d07e0aea30f35 Mon Sep 17 00:00:00 2001 From: Rodrigo Vivi Date: Wed, 30 Aug 2017 21:52:23 -0700 Subject: [PATCH] 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 Cc: Arthur J Runyan Cc: Dhinakaran Pandiyan Signed-off-by: Rodrigo Vivi Reviewed-by: Dhinakaran Pandiyan Link: https://patchwork.freedesktop.org/patch/msgid/20170831045223.3960-1-rodrigo.vivi@intel.com --- 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 c718c2f2eaeb..5651081ff789 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -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 */ diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index b0ba5a1018cd..f5d77b131b58 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; -- 2.30.2