radeonsi: don't set VGT_LS_HS_CONFIG if it doesn't change

[mesa.git] / src / gallium / drivers / radeonsi / si_state_draw.c

diff --git a/src/gallium/drivers/radeonsi/si_state_draw.c b/src/gallium/drivers/radeonsi/si_state_draw.c
index 845ec468aec0d0a10abc56a316ef0615fee37d96..42522c012915b72d58275c4e3abfd09e2ee35f8d 100644 (file)
--- a/src/gallium/drivers/radeonsi/si_state_draw.c
+++ b/src/gallium/drivers/radeonsi/si_state_draw.c
@@ -280,12 +280,16 @@ static void si_emit_derived_tess_state(struct si_context *sctx,
                       S_028B58_HS_NUM_INPUT_CP(num_tcs_input_cp) |
                       S_028B58_HS_NUM_OUTPUT_CP(num_tcs_output_cp);
 
-       if (sctx->chip_class >= CIK)
-               radeon_set_context_reg_idx(cs, R_028B58_VGT_LS_HS_CONFIG, 2,
-                                          ls_hs_config);
-       else
-               radeon_set_context_reg(cs, R_028B58_VGT_LS_HS_CONFIG,
-                                      ls_hs_config);
+       if (sctx->last_ls_hs_config != ls_hs_config) {
+               if (sctx->chip_class >= CIK) {
+                       radeon_set_context_reg_idx(cs, R_028B58_VGT_LS_HS_CONFIG, 2,
+                                                  ls_hs_config);
+               } else {
+                       radeon_set_context_reg(cs, R_028B58_VGT_LS_HS_CONFIG,
+                                              ls_hs_config);
+               }
+               sctx->last_ls_hs_config = ls_hs_config;
+       }
 }
 
 static unsigned si_num_prims_for_vertices(const struct pipe_draw_info *info)