Re: [PATCH v2 8/8] drm/i915/gen9: Add WaOCLCoherentLineFlush

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On 21/01/2016 14:00, Arun Siluvery wrote:
This is mainly required for preemption.

Cc: Dave Gordon <david.s.gordon@xxxxxxxxx>
Signed-off-by: Arun Siluvery <arun.siluvery@xxxxxxxxxxxxxxx>

Reviewed-by: Nick Hoath <nicholas.hoath@xxxxxxxxx>

---
  drivers/gpu/drm/i915/intel_ringbuffer.c | 4 ++++
  1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index e91fb70..f26f274 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -979,6 +979,10 @@ static int gen9_init_workarounds(struct intel_engine_cs *ring)
  	/* WaDisableSTUnitPowerOptimization:skl,bxt */
  	WA_SET_BIT_MASKED(HALF_SLICE_CHICKEN2, GEN8_ST_PO_DISABLE);

+	/* WaOCLCoherentLineFlush:skl,bxt */
+	I915_WRITE(GEN8_L3SQCREG4, (I915_READ(GEN8_L3SQCREG4) |
+				    GEN8_LQSC_FLUSH_COHERENT_LINES));
+
  	/* WaEnablePreemptionGranularityControlByUMD:skl,bxt */
  	ret= wa_ring_whitelist_reg(ring, GEN8_CS_CHICKEN1);
  	if (ret)


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