[Intel-gfx] [PATCH 8/8] drm/i915: Add WaDisableLSQCROPERFforOCL:bdw

[Michel Thierry]

L3SQCREG4 LQSC RO PERF DIS must be programmed by software to 1h
(Disable) to work around a Gsync Issue in HDC.

Signed-off-by: Michel Thierry <michel.thierry at intel.com>
---
 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 2f0c759..9058ae4 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4714,6 +4714,7 @@ enum punit_power_well {
 #define  GEN8_TAG_CLK_OFFTIME_MASK		(~((1<<23) | (1<<22) | (1<<21) | (1<<20)))
 
 #define GEN8_L3SQCREG4				0xb118
+#define  GEN8_L3SQCREG4_LQSC_RO_PERF_DISABLE	(1<<27)
 #define  GEN8_PIPELINE_FLUSH_COHERENT_LINES	(1<<21)
 
 /* WaCatErrorRejectionIssue */
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index c16dcb3..41a438e 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5495,8 +5495,10 @@ static void gen8_init_clock_gating(struct drm_device *dev)
 	I915_WRITE(GEN7_MISCCPCTL, I915_READ(GEN7_MISCCPCTL) &
 			~GEN8_DOP_CLOCK_GATE_CFCLK_ENABLE);
 
+	/* WaDisableLSQCROPERFforOCL:bdw */
 	/* WaFlushCoherentL3CacheLinesAtContextSwitch:bdw */
 	I915_WRITE(GEN8_L3SQCREG4, I915_READ(GEN8_L3SQCREG4) |
+			GEN8_L3SQCREG4_LQSC_RO_PERF_DISABLE |
 			GEN8_PIPELINE_FLUSH_COHERENT_LINES);
 
 	/*
-- 
1.9.0