[Intel-gfx] [PATCH 11/22] drm/i915/icl: Wa_1604302699

[Oscar Mateo]

Disable I2M Write for performance reasons.

v2: Rebased on top of the WA refactoring

Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
Signed-off-by: Oscar Mateo <oscar.mateo at intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h          | 4 +++-
 drivers/gpu/drm/i915/intel_workarounds.c | 5 +++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 9ab5731..b462938 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7192,7 +7192,9 @@ enum {
 #define GEN7_L3CNTLREG3				_MMIO(0xB024)
 
 #define GEN7_L3_CHICKEN_MODE_REGISTER		_MMIO(0xB030)
-#define  GEN7_WA_L3_CHICKEN_MODE				0x20000000
+#define GEN10_L3_CHICKEN_MODE_REGISTER		_MMIO(0xB114)
+#define  GEN7_WA_L3_CHICKEN_MODE		0x20000000
+#define  GEN11_I2M_WRITE_DISABLE		(1 << 28)
 
 #define GEN7_L3SQCREG4				_MMIO(0xb034)
 #define  L3SQ_URB_READ_CAM_MATCH_DISABLE	(1<<27)
diff --git a/drivers/gpu/drm/i915/intel_workarounds.c b/drivers/gpu/drm/i915/intel_workarounds.c
index 57a69aa..0cebafa 100644
--- a/drivers/gpu/drm/i915/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/intel_workarounds.c
@@ -757,6 +757,11 @@ static void icl_gt_workarounds_apply(struct drm_i915_private *dev_priv)
 	I915_WRITE(SUBSLICE_UNIT_LEVEL_CLKGATE,
 		   (I915_READ(SUBSLICE_UNIT_LEVEL_CLKGATE) |
 		    GWUNIT_CLKGATE_DIS));
+
+	/* Wa_1604302699:icl */
+	I915_WRITE(GEN10_L3_CHICKEN_MODE_REGISTER,
+		   (I915_READ(GEN10_L3_CHICKEN_MODE_REGISTER) |
+		    GEN11_I2M_WRITE_DISABLE));
 }
 
 void intel_gt_workarounds_apply(struct drm_i915_private *dev_priv)
-- 
1.9.1