According to bspec this prevents screen corruption when fbc is
used.
References: HSD#2135555, HSD#2137270
Cc: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
Signed-off-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_pm.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 262180c0ba70..62734a16e873 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -67,6 +67,9 @@ static void gen9_init_clock_gating(struct drm_device *dev)
I915_WRITE(GEN8_CHICKEN_DCPR_1,
I915_READ(GEN8_CHICKEN_DCPR_1) | MASK_WAKEMEM);
+
+ I915_WRITE(DISP_ARB_CTL,
+ I915_READ(DISP_ARB_CTL) | DISP_FBC_WM_DIS);
}
static void bxt_init_clock_gating(struct drm_device *dev)
@@ -2798,7 +2801,7 @@ static void ilk_write_wm_values(struct drm_i915_private *dev_priv,
if (dirty & WM_DIRTY_FBC) {
val = I915_READ(DISP_ARB_CTL);
- if (results->enable_fbc_wm)
+ if (!IS_GEN9(dev) && results->enable_fbc_wm)
val &= ~DISP_FBC_WM_DIS;
else
val |= DISP_FBC_WM_DIS;
--
2.5.0
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