radeonsi/gfx9: allow CMASK fast clear with RB+

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

src/gallium/drivers/radeon/r600_texture.c

@@ -2691,13 +2691,13 @@ void evergreen_do_fast_color_clear(struct r600_common_context *rctx,
 		    !(rctx->screen->debug_flags & DBG_NO_DCC_FB)) {
 			vi_separate_dcc_try_enable(rctx, tex);
 
-			/* RB+ isn't supported with a CMASK-based clear, so all
-			 * clears are considered to be hypothetically slow
+			/* RB+ isn't supported with a CMASK clear only on Stoney,
+			 * so all clears are considered to be hypothetically slow
 			 * clears, which is weighed when determining whether to
 			 * enable separate DCC.
 			 */
 			if (tex->dcc_gather_statistics &&
-			    rctx->screen->rbplus_allowed)
+			    rctx->family == CHIP_STONEY)
 				tex->num_slow_clears++;
 		}
 
@@ -2729,8 +2729,8 @@ void evergreen_do_fast_color_clear(struct r600_common_context *rctx,
 				continue;
 			}
 
-			/* RB+ doesn't work with CMASK fast clear. */
-			if (rctx->screen->rbplus_allowed)
+			/* RB+ doesn't work with CMASK fast clear on Stoney. */
+			if (rctx->family == CHIP_STONEY)
 				continue;
 
 			/* ensure CMASK is enabled */