radeonsi: apply a tessellation bug workaround for SI

Cc: 13.0 <mesa-stable@lists.freedesktop.org> Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
2016-11-29 20:41:23 +01:00
parent 72e46c9889
commit 78c4528ae7
1 changed files with 7 additions and 0 deletions
@@ -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;