r600g: emit DB_SRESULTS_COMPARE_STATE0 on r6xx/r7xx

Not using HiS yet, but matches what we do on evergreen+.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

src/gallium/drivers/r600/r600_state.c

@@ -2623,7 +2623,8 @@ void r600_init_atom_start_cs(struct r600_context *rctx)
 	r600_store_value(cb, 0); /* R_0286E0_SPI_FOG_FUNC_SCALE */
 	r600_store_value(cb, 0); /* R_0286E4_SPI_FOG_FUNC_BIAS */
 
-	r600_store_context_reg_seq(cb, R_028D2C_DB_SRESULTS_COMPARE_STATE1, 2);
+	r600_store_context_reg_seq(cb, R_028D28_DB_SRESULTS_COMPARE_STATE0, 3);
+	r600_store_value(cb, 0); /* R_028D28_DB_SRESULTS_COMPARE_STATE0 */
 	r600_store_value(cb, 0); /* R_028D2C_DB_SRESULTS_COMPARE_STATE1 */
 	r600_store_value(cb, 0); /* R_028D30_DB_PRELOAD_CONTROL */
 

src/gallium/drivers/r600/r600d.h

@@ -2318,6 +2318,7 @@
 #define R_02880C_DB_SHADER_CONTROL                   0x02880C
 #define R_028D0C_DB_RENDER_CONTROL                   0x028D0C
 #define R_028D10_DB_RENDER_OVERRIDE                  0x028D10
+#define R_028D28_DB_SRESULTS_COMPARE_STATE0          0x028D28
 #define R_028D2C_DB_SRESULTS_COMPARE_STATE1          0x028D2C
 #define R_028D30_DB_PRELOAD_CONTROL                  0x028D30
 #define R_028D44_DB_ALPHA_TO_MASK                    0x028D44