Disable I2M Write for performance reasons.
v2: Rebased on top of the WA refactoring
v3: Added References (Mika)
References: HSDES#1604302699
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
Signed-off-by: Oscar Mateo <oscar.mateo@xxxxxxxxx>
---
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 b7e5ca0..f6a38fd 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7227,7 +7227,9 @@ 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 ffb0e30..bba43fd 100644
--- a/drivers/gpu/drm/i915/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/intel_workarounds.c
@@ -750,6 +750,11 @@ 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
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