drm/radeon: drop drivers copy of the rptr

In all cases where it really matters we are using the read functions anyway.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/uvd_v1_0.c b/drivers/gpu/drm/radeon/uvd_v1_0.c
index d4a68af..0a243f0 100644
--- a/drivers/gpu/drm/radeon/uvd_v1_0.c
+++ b/drivers/gpu/drm/radeon/uvd_v1_0.c
@@ -262,7 +262,7 @@
 	/* Initialize the ring buffer's read and write pointers */
 	WREG32(UVD_RBC_RB_RPTR, 0x0);
 
-	ring->wptr = ring->rptr = RREG32(UVD_RBC_RB_RPTR);
+	ring->wptr = RREG32(UVD_RBC_RB_RPTR);
 	WREG32(UVD_RBC_RB_WPTR, ring->wptr);
 
 	/* set the ring address */