drm/radeon/kms: disable bo moves using the blitter

Blitting from vram to gart is problematic at the moment.
Use the CPU for now to avoid buffer corruption.
Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/evergreen.c

@@ -2782,6 +2782,11 @@ static int evergreen_startup(struct radeon_device *rdev)
 		rdev->asic->copy = NULL;
 		dev_warn(rdev->dev, "failed blitter (%d) falling back to memcpy\n", r);
 	}
+	/* XXX: ontario has problems blitting to gart at the moment */
+	if (rdev->family == CHIP_PALM) {
+		rdev->asic->copy = NULL;
+		rdev->mc.active_vram_size = rdev->mc.visible_vram_size;
+	}
 
 	/* allocate wb buffer */
 	r = radeon_wb_init(rdev);