drm/radeon: make cp variable an array

Replace cp, cp1 and cp2 members with just an array
of radeon_cp structs.

Signed-off-by: Christian König <deathsimple@vodafone.de>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/r420.c b/drivers/gpu/drm/radeon/r420.c
index 4c0af49..62e8604 100644
--- a/drivers/gpu/drm/radeon/r420.c
+++ b/drivers/gpu/drm/radeon/r420.c
@@ -199,7 +199,7 @@
 
 static void r420_cp_errata_init(struct radeon_device *rdev)
 {
-	struct radeon_cp *cp = &rdev->cp;
+	struct radeon_cp *cp = &rdev->cp[RADEON_RING_TYPE_GFX_INDEX];
 
 	/* RV410 and R420 can lock up if CP DMA to host memory happens
 	 * while the 2D engine is busy.
@@ -217,7 +217,7 @@
 
 static void r420_cp_errata_fini(struct radeon_device *rdev)
 {
-	struct radeon_cp *cp = &rdev->cp;
+	struct radeon_cp *cp = &rdev->cp[RADEON_RING_TYPE_GFX_INDEX];
 
 	/* Catch the RESYNC we dispatched all the way back,
 	 * at the very beginning of the CP init.