On 19/04/16 15:45, tim.gore@xxxxxxxxx wrote:
From: Tim Gore <tim.gore@xxxxxxxxx>
WaEnableSamplerGPGPUPreemptionSupport fixes a problem
related to mid thread pre-emption.
Signed-off-by: Tim Gore <tim.gore@xxxxxxxxx>
Reviewed-by: Dave Gordon <david.s.gordon@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 1 +
drivers/gpu/drm/i915/intel_ringbuffer.c | 7 ++++---
2 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 9464ba3..2982470b 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7162,6 +7162,7 @@ enum skl_disp_power_wells {
#define GEN9_HALF_SLICE_CHICKEN7 _MMIO(0xe194)
#define GEN9_ENABLE_YV12_BUGFIX (1<<4)
+#define GEN9_ENABLE_GPGPU_PREEMPTION (1<<2)
/* Audio */
#define G4X_AUD_VID_DID _MMIO(dev_priv->info.display_mmio_offset + 0x62020)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 0d24494..444d30a 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -959,9 +959,10 @@ static int gen9_init_workarounds(struct intel_engine_cs *engine)
}
/* WaEnableYV12BugFixInHalfSliceChicken7:skl,bxt */
- if (IS_SKL_REVID(dev, SKL_REVID_C0, REVID_FOREVER) || IS_BROXTON(dev))
- WA_SET_BIT_MASKED(GEN9_HALF_SLICE_CHICKEN7,
- GEN9_ENABLE_YV12_BUGFIX);
+ /* WaEnableSamplerGPGPUPreemptionSupport:skl,bxt */
+ WA_SET_BIT_MASKED(GEN9_HALF_SLICE_CHICKEN7,
+ GEN9_ENABLE_YV12_BUGFIX |
+ GEN9_ENABLE_GPGPU_PREEMPTION);
/* Wa4x4STCOptimizationDisable:skl,bxt */
/* WaDisablePartialResolveInVc:skl,bxt */
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