drm: radeon: Use RADEON_RB3D_DSTCACHE_CTLSTAT instead of RADEON_RB2D_DSTCACHE_CTLSTAT.

The latter seems to be a read-only mirror of the former.

Signed-off-by: Dave Airlie <airlied@linux.ie>
diff --git a/drivers/char/drm/radeon_drv.h b/drivers/char/drm/radeon_drv.h
index b54b896..2f51d51 100644
--- a/drivers/char/drm/radeon_drv.h
+++ b/drivers/char/drm/radeon_drv.h
@@ -545,6 +545,11 @@
 #	define RADEON_RB3D_ZC_FREE		(1 << 2)
 #	define RADEON_RB3D_ZC_FLUSH_ALL		0x5
 #	define RADEON_RB3D_ZC_BUSY		(1 << 31)
+#define RADEON_RB3D_DSTCACHE_CTLSTAT	0x325c
+#	define RADEON_RB3D_DC_FLUSH		(3 << 0)
+#	define RADEON_RB3D_DC_FREE		(3 << 2)
+#	define RADEON_RB3D_DC_FLUSH_ALL		0xf
+#	define RADEON_RB3D_DC_BUSY		(1 << 31)
 #define RADEON_RB3D_ZSTENCILCNTL	0x1c2c
 #	define RADEON_Z_TEST_MASK		(7 << 4)
 #	define RADEON_Z_TEST_ALWAYS		(7 << 4)
@@ -987,12 +992,12 @@
 } while (0)
 
 #define RADEON_FLUSH_CACHE() do {					\
-	OUT_RING( CP_PACKET0( RADEON_RB2D_DSTCACHE_CTLSTAT, 0 ) );	\
+	OUT_RING( CP_PACKET0( RADEON_RB3D_DSTCACHE_CTLSTAT, 0 ) );	\
 	OUT_RING( RADEON_RB2D_DC_FLUSH );				\
 } while (0)
 
 #define RADEON_PURGE_CACHE() do {					\
-	OUT_RING( CP_PACKET0( RADEON_RB2D_DSTCACHE_CTLSTAT, 0 ) );	\
+	OUT_RING( CP_PACKET0( RADEON_RB3D_DSTCACHE_CTLSTAT, 0 ) );	\
 	OUT_RING( RADEON_RB2D_DC_FLUSH_ALL );				\
 } while (0)