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-rw-r--r--src/gallium/drivers/radeonsi/si_state_draw.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/src/gallium/drivers/radeonsi/si_state_draw.c b/src/gallium/drivers/radeonsi/si_state_draw.c
index 10073ef9d74..cba5a03bebe 100644
--- a/src/gallium/drivers/radeonsi/si_state_draw.c
+++ b/src/gallium/drivers/radeonsi/si_state_draw.c
@@ -166,6 +166,13 @@ static void si_emit_derived_tess_state(struct si_context *sctx,
* 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;