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drm/i915: Disable SAMPLER_STATE prefetching on all Gen11 steppings.

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The Demand Prefetch workaround (binding table prefetching) only applies
to Icelake A0/B0.  But the Sampler Prefetch workaround needs to be
applied to all Gen11 steppings, according to a programming note in the
SARCHKMD documentation.

Using the Intel Gallium driver, I have seen intermittent failures in
the dEQP-GLES31.functional.copy_image.non_compressed.* tests.  After
applying this workaround, the tests reliably pass.

v2: Remove the overlap with a pre-production w/a

BSpec: 9663
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@vger.kernel.org
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190625090655.19220-1-chris@chris-wilson.co.uk
(cherry picked from commit f9a393875d)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Kenneth Graunke 2019-06-25 10:06:55 +01:00 committed by Jani Nikula
parent ac65bdfef1
commit 248f883db6
1 changed files with 6 additions and 2 deletions
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8
drivers/gpu/drm/i915/gt/intel_workarounds.c
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@ -1258,8 +1258,12 @@ rcs_engine_wa_init(struct intel_engine_cs *engine, struct i915_wa_list *wal)
if (IS_ICL_REVID(i915, ICL_REVID_A0, ICL_REVID_B0))
wa_write_or(wal,
GEN7_SARCHKMD,
GEN7_DISABLE_DEMAND_PREFETCH |
GEN7_DISABLE_SAMPLER_PREFETCH);
GEN7_DISABLE_DEMAND_PREFETCH);
/* Wa_1606682166:icl */
wa_write_or(wal,
GEN7_SARCHKMD,
GEN7_DISABLE_SAMPLER_PREFETCH);
}
if (IS_GEN_RANGE(i915, 9, 11)) {