From: Anuj Phogat <anuj.phogat@xxxxxxxxx>
Incorrect TDL's SSP address shift in SARB for 16:6 & 18:8 modes.
Disable the Sampler state prefetch functionality in the SARB by
programming 0xB000[30] to '1'. This is to be done at boot time
and the feature must remain disabled permanently.
Fixes flaky tex-mip-level-selection* piglit tests with Mesa i965
driver.
Cc: Radhakrishna Sripada <radhakrishna.sripada@xxxxxxxxx>
Signed-off-by: Anuj Phogat <anuj.phogat@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 1 +
drivers/gpu/drm/i915/intel_workarounds.c | 3 ++-
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index fa020425754f..0c544161ed47 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7415,6 +7415,7 @@ enum {
#define GEN7_SARCHKMD _MMIO(0xB000)
#define GEN7_DISABLE_DEMAND_PREFETCH (1 << 31)
+#define GEN7_DISABLE_SAMPLER_PREFETCH (1 << 30)
#define GEN7_L3SQCREG1 _MMIO(0xB010)
#define VLV_B0_WA_L3SQCREG1_VALUE 0x00D30000
diff --git a/drivers/gpu/drm/i915/intel_workarounds.c b/drivers/gpu/drm/i915/intel_workarounds.c
index cf4f4c1f86ab..7157115e5bc9 100644
--- a/drivers/gpu/drm/i915/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/intel_workarounds.c
@@ -910,7 +910,8 @@ static void icl_gt_workarounds_apply(struct drm_i915_private *dev_priv)
if (IS_ICL_REVID(dev_priv, ICL_REVID_A0, ICL_REVID_B0))
I915_WRITE(GEN7_SARCHKMD,
I915_READ(GEN7_SARCHKMD) |
- GEN7_DISABLE_DEMAND_PREFETCH);
+ GEN7_DISABLE_DEMAND_PREFETCH |
+ GEN7_DISABLE_SAMPLER_PREFETCH);
}
void intel_gt_workarounds_apply(struct drm_i915_private *dev_priv)
--
2.9.3
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