drm/radeon/kms: clean up r6xx/r7xx blit init (v2)

Move common code to init function.

v2: make sure the bo is pinned after init as well.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/rv770.c b/drivers/gpu/drm/radeon/rv770.c
index bfa59db..bc2beb7 100644
--- a/drivers/gpu/drm/radeon/rv770.c
+++ b/drivers/gpu/drm/radeon/rv770.c
@@ -1028,19 +1028,7 @@
 		rdev->asic->copy = NULL;
 		dev_warn(rdev->dev, "failed blitter (%d) falling back to memcpy\n", r);
 	}
-	/* pin copy shader into vram */
-	if (rdev->r600_blit.shader_obj) {
-		r = radeon_bo_reserve(rdev->r600_blit.shader_obj, false);
-		if (unlikely(r != 0))
-			return r;
-		r = radeon_bo_pin(rdev->r600_blit.shader_obj, RADEON_GEM_DOMAIN_VRAM,
-				&rdev->r600_blit.shader_gpu_addr);
-		radeon_bo_unreserve(rdev->r600_blit.shader_obj);
-		if (r) {
-			DRM_ERROR("failed to pin blit object %d\n", r);
-			return r;
-		}
-	}
+
 	/* Enable IRQ */
 	r = r600_irq_init(rdev);
 	if (r) {