From: "Hoath, Nicholas" <nicholas.hoath@xxxxxxxxx>
Add:
WaForceEnableNonCoherent
v1: Don't add WaHdcDisableFetchWhenMasked. Add stepping check for WaForceEnableNonCoherent
Signed-off-by: Nick Hoath <nicholas.hoath@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_ringbuffer.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 066b63d..36885b4 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -902,6 +902,17 @@ static int gen9_init_workarounds(struct intel_engine_cs *ring)
GEN9_ENABLE_YV12_BUGFIX);
}
+ if (INTEL_REVID(dev) <= SKL_D0_REVID) {
+ /*
+ *Use Force Non-Coherent whenever executing a 3D context. This
+ * is a workaround for a possible hang in the unlikely event
+ * a TLB invalidation occurs during a PSD flush.
+ */
+ /* WaForceEnableNonCoherent:skl */
+ WA_SET_BIT_MASKED(HDC_CHICKEN0,
+ HDC_FORCE_NON_COHERENT);
+ }
+
/* Wa4x4STCOptimizationDisable:skl */
WA_SET_BIT_MASKED(CACHE_MODE_1, GEN8_4x4_STC_OPTIMIZATION_DISABLE);
--
2.1.1
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