In commit e4e0c058a19c41150d12ad2d3023b3cf09c5de67
Author: Eugeni Dodonov <eugeni.dodonov@xxxxxxxxx>
Date: Wed Feb 8 12:53:50 2012 -0800
drm/i915: gen7: Implement an L3 caching workaround.
the L3 cache aging was disabled. This was part of a shotgun response
to a number of GPU hang bugs, but there appears to be no documentation
to suggest that disabling the L3 cache age was ever required (to prevent
the GPU hangs).
Restoring the L3 cache age is a minor performance win of around 2%
on IVB:GT2. (Note that this value seems to be consistent across a number
of tests and so appears to be above the usual noise.)
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Kenneth Graunke <kenneth@xxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index a2c68c9492ba..d40d71bb66b6 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4171,7 +4171,7 @@
#define VLV_B0_WA_L3SQCREG1_VALUE 0x00D30000
#define GEN7_L3CNTLREG1 0xB01C
-#define GEN7_WA_FOR_GEN7_L3_CONTROL 0x3C4FFF8C
+#define GEN7_WA_FOR_GEN7_L3_CONTROL 0x3C47FF8C
#define GEN7_L3AGDIS (1<<19)
#define GEN7_L3_CHICKEN_MODE_REGISTER 0xB030
--
1.9.0.rc3
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