This WA is required when decoupled frequencies for slice and unslice
are enabled. This disables DOP clock gating for gen9.
v2: enable the WA for all gen9 platforms (not just for SKL GT4 where
the hang issue is originally reported) to avoid rare hangs (David)
Cc: David Weinehall <david.weinehall@xxxxxxxxxxxxxxx>
Reviewed-by: David Weinehall <david.weinehall@xxxxxxxxxxxxxxx>
Signed-off-by: Praveen Paneri <praveen.paneri@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_pm.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 3fc42aa..e369d77 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -88,6 +88,12 @@ static void gen9_init_clock_gating(struct drm_i915_private *dev_priv)
/* WaFbcHighMemBwCorruptionAvoidance:skl,bxt,kbl,cfl */
I915_WRITE(ILK_DPFC_CHICKEN, I915_READ(ILK_DPFC_CHICKEN) |
ILK_DPFC_DISABLE_DUMMY0);
+
+ if (IS_GEN9(dev_priv)) {
+ /* WaDisableDopClockGating */
+ I915_WRITE(GEN7_MISCCPCTL, I915_READ(GEN7_MISCCPCTL)
+ & ~GEN7_DOP_CLOCK_GATE_ENABLE);
+ }
}
static void bxt_init_clock_gating(struct drm_i915_private *dev_priv)
--
1.9.1
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