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intel/blorp: Disable sampler state prefetching on Gen11 

Sampler state prefetching is broken on Gen11, and WA_160668216 says
to disable it.  Apparently sampler state prefetching also has basically
zero impact on performance, so we don't need to worry there.

i965, anv, and iris already handle this correctly, but we missed BLORP.
Ideally the kernel should globally disable this by writing SARCHKMD, at
which point we wouldn't have to worry about it.  But let's be defensive
and handle it ourselves too.

v2: separate out from BTP workaround in case we change that eventually

Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com> [v1]
This commit is contained in:
Kenneth Graunke 2019-06-24 15:09:51 -07:00
parent 0a364a4a74
commit 748e5dac72
1 changed files with 4 additions and 0 deletions
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4
src/intel/blorp/blorp_genX_exec.h
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@ -778,6 +778,10 @@ blorp_emit_ps_config(struct blorp_batch *batch,
if (GEN_GEN == 11)
ps.BindingTableEntryCount = 0;
/* SAMPLER_STATE prefetching is broken on Gen11 - WA_1606682166 */
if (GEN_GEN == 11)
ps.SamplerCount = 0;
if (prog_data) {
ps._8PixelDispatchEnable = prog_data->dispatch_8;
ps._16PixelDispatchEnable = prog_data->dispatch_16;