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radeonsi/gfx9: add a temporary workaround for a tessellation driver bug

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The workaround will do for now. The root cause is still unknown.

This fixes new piglit: 16in-1out

Cc: 17.1 17.2 <mesa-stable@lists.freedesktop.org>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
This commit is contained in:
Marek Olšák
2017-08-16 00:54:45 +02:00
parent 248555ed2f
commit 166823bfd2
1 changed files with 5 additions and 1 deletions
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6
src/gallium/drivers/radeonsi/si_state_draw.c
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@@ -195,7 +195,11 @@ static void si_emit_derived_tess_state(struct si_context *sctx,
*/
*num_patches = MIN2(*num_patches, 40);
if (sctx->b.chip_class == SI) {
if (sctx->b.chip_class == SI ||
/* TODO: fix GFX9 where a threadgroup contains more than 1 wave and
* LS vertices per patch > HS vertices per patch. Piglit: 16in-1out */
(sctx->b.chip_class == GFX9 &&
num_tcs_input_cp > num_tcs_output_cp)) {
/* SI bug workaround, related to power management. Limit LS-HS
* threadgroups to only one wave.
*/