From: Mika Kuoppala Date: Tue, 7 Jun 2016 14:19:16 +0000 (+0300) Subject: drm/i915/gen9: Add WaFbcTurnOffFbcWatermark X-Git-Tag: v4.9.8~1744^2^2~6 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f20b1ba04e917be9cadd3171a99568a1badb8b1b;p=platform%2Fkernel%2Flinux-rpi3.git 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 Cc: Ville Syrjälä Signed-off-by: Mika Kuoppala Reviewed-by: Ville Syrjälä Link: http://patchwork.freedesktop.org/patch/msgid/1465309159-30531-25-git-send-email-mika.kuoppala@intel.com (cherry picked from commit 0f78dee6f06a9399d4bdf79575094cc761b872ac) Signed-off-by: Mika Kuoppala --- diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 362800b..5eb48ad 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -68,6 +68,10 @@ static void gen9_init_clock_gating(struct drm_device *dev) /* WaEnableChickenDCPR:skl,bxt,kbl */ I915_WRITE(GEN8_CHICKEN_DCPR_1, 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)