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drm/i915/gen9: Add WaFbcTurnOffFbcWatermark
author
Mika Kuoppala
<mika.kuoppala@linux.intel.com>
Tue, 7 Jun 2016 14:19:16 +0000
(17:19 +0300)
committer
Mika Kuoppala
<mika.kuoppala@intel.com>
Fri, 15 Jul 2016 12:51:28 +0000
(15:51 +0300)
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: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Ville 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
0f78dee6f06a9399d4bdf79575094cc761b872ac
)
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
drivers/gpu/drm/i915/intel_pm.c
patch
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diff --git
a/drivers/gpu/drm/i915/intel_pm.c
b/drivers/gpu/drm/i915/intel_pm.c
index
362800b
..
5eb48ad
100644
(file)
--- 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)