Commit f20b1ba0 authored by Mika Kuoppala's avatar Mika Kuoppala Committed by Mika Kuoppala

drm/i915/gen9: Add WaFbcTurnOffFbcWatermark

According to bspec this prevents screen corruption when fbc is
used.

v2: This workaround has a name, use it (Ville)
v3: remove bogus gen check on ilk/vlv wm path (Ville)

References: HSD#2135555, HSD#2137270, BSID#562
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: default avatarMika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1465309159-30531-25-git-send-email-mika.kuoppala@intel.com
(cherry picked from commit 0f78dee6)
Signed-off-by: default avatarMika Kuoppala <mika.kuoppala@intel.com>
parent 703d1282
...@@ -68,6 +68,10 @@ static void gen9_init_clock_gating(struct drm_device *dev) ...@@ -68,6 +68,10 @@ static void gen9_init_clock_gating(struct drm_device *dev)
/* WaEnableChickenDCPR:skl,bxt,kbl */ /* WaEnableChickenDCPR:skl,bxt,kbl */
I915_WRITE(GEN8_CHICKEN_DCPR_1, I915_WRITE(GEN8_CHICKEN_DCPR_1,
I915_READ(GEN8_CHICKEN_DCPR_1) | MASK_WAKEMEM); I915_READ(GEN8_CHICKEN_DCPR_1) | MASK_WAKEMEM);
/* WaFbcTurnOffFbcWatermark:skl,bxt,kbl */
I915_WRITE(DISP_ARB_CTL,
I915_READ(DISP_ARB_CTL) | DISP_FBC_WM_DIS);
} }
static void bxt_init_clock_gating(struct drm_device *dev) static void bxt_init_clock_gating(struct drm_device *dev)
......
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