nouveau/nvc0: Extract common tile mode macro

Add a new macro that can be used to extract the tiling mode from a
tile_mode value. This is will be used to determine the number of GOBs
used in block linear mode.

Acked-by: Emil Velikov <emil.velikov@collabora.com>
Tested-by: Andre Heider <a.heider@gmail.com>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Thierry Reding <treding@nvidia.com>

src/gallium/drivers/nouveau/nvc0/nvc0_resource.h

@@ -6,14 +6,17 @@
 
 #define NVC0_RESOURCE_FLAG_VIDEO (NOUVEAU_RESOURCE_FLAG_DRV_PRIV << 0)
 
+#define NVC0_TILE_MODE_X(m) (((m) >> 0) & 0xf)
+#define NVC0_TILE_MODE_Y(m) (((m) >> 4) & 0xf)
+#define NVC0_TILE_MODE_Z(m) (((m) >> 8) & 0xf)
 
-#define NVC0_TILE_SHIFT_X(m) ((((m) >> 0) & 0xf) + 6)
-#define NVC0_TILE_SHIFT_Y(m) ((((m) >> 4) & 0xf) + 3)
-#define NVC0_TILE_SHIFT_Z(m) ((((m) >> 8) & 0xf) + 0)
+#define NVC0_TILE_SHIFT_X(m) (NVC0_TILE_MODE_X(m) + 6)
+#define NVC0_TILE_SHIFT_Y(m) (NVC0_TILE_MODE_Y(m) + 3)
+#define NVC0_TILE_SHIFT_Z(m) (NVC0_TILE_MODE_Z(m) + 0)
 
-#define NVC0_TILE_SIZE_X(m) (64 << (((m) >> 0) & 0xf))
-#define NVC0_TILE_SIZE_Y(m) ( 8 << (((m) >> 4) & 0xf))
-#define NVC0_TILE_SIZE_Z(m) ( 1 << (((m) >> 8) & 0xf))
+#define NVC0_TILE_SIZE_X(m) (64 << NVC0_TILE_MODE_X(m))
+#define NVC0_TILE_SIZE_Y(m) ( 8 << NVC0_TILE_MODE_Y(m))
+#define NVC0_TILE_SIZE_Z(m) ( 1 << NVC0_TILE_MODE_Z(m))
 
 /* it's ok to mask only in the end because max value is 3 * 5 */