From: Michel Thierry <michel.thierry@xxxxxxxxx>
HDC_CHICKEN0 bit 14 (Fence Destination To SLM Disable) must be
programmed by software to 1h (Disable) to work around a LSLM unit issue.
WaDisableFenceDestinationToSLM is only needed for BDW E,F step.
Issue: APDEV-3096
Signed-off-by: Michel Thierry <michel.thierry@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 1 +
drivers/gpu/drm/i915/intel_pm.c | 2 ++
2 files changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 247be2a..4ff95a8 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4672,6 +4672,7 @@ enum punit_power_well {
/* GEN8 chicken */
#define HDC_CHICKEN0 0x7300
+#define HDC_FENCE_DESTINATION_TO_SLM_DISABLE (1<<14)
#define HDC_FORCE_NON_COHERENT (1<<4)
/* WaCatErrorRejectionIssue */
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index ee27d74..3968078 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5330,8 +5330,10 @@ static void gen8_init_clock_gating(struct drm_device *dev)
* workaround for for a possible hang in the unlikely event a TLB
* invalidation occurs during a PSD flush.
*/
+ /* WaDisableFenceDestinationToSLM:bdw */
I915_WRITE(HDC_CHICKEN0,
I915_READ(HDC_CHICKEN0) |
+ _MASKED_BIT_ENABLE(HDC_FENCE_DESTINATION_TO_SLM_DISABLE) |
_MASKED_BIT_ENABLE(HDC_FORCE_NON_COHERENT));
/* WaVSRefCountFullforceMissDisable:bdw */
--
1.9.0
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