From: Marek Olšák <[email protected]>
Cc: 13.0 <[email protected]>
---
src/gallium/drivers/radeonsi/si_state_draw.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/src/gallium/drivers/radeonsi/si_state_draw.c
b/src/gallium/drivers/radeonsi/si_state_draw.c
index 10073ef..cba5a03 100644
--- a/src/gallium/drivers/radeonsi/si_state_draw.c
+++ b/src/gallium/drivers/radeonsi/si_state_draw.c
@@ -159,20 +159,27 @@ static void si_emit_derived_tess_state(struct si_context
*sctx,
/* Make sure the output data fits in the offchip buffer */
*num_patches = MIN2(*num_patches,
(sctx->screen->tess_offchip_block_dw_size * 4) /
output_patch_size);
/* Not necessary for correctness, but improves performance. The
* specific value is taken from the proprietary driver.
*/
*num_patches = MIN2(*num_patches, 40);
+
+ /* SI bug workaround - limit LS-HS threadgroups to only one wave. */
+ if (sctx->b.chip_class == SI) {
+ unsigned one_wave = 64 / MAX2(num_tcs_input_cp,
num_tcs_output_cp);
+ *num_patches = MIN2(*num_patches, one_wave);
+ }
+
sctx->last_num_patches = *num_patches;
output_patch0_offset = input_patch_size * *num_patches;
perpatch_output_offset = output_patch0_offset +
pervertex_output_patch_size;
lds_size = output_patch0_offset + output_patch_size * *num_patches;
ls_rsrc2 = ls->current->config.rsrc2;
if (sctx->b.chip_class >= CIK) {
assert(lds_size <= 65536);
--
2.7.4
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