virtio-gpu: fix vblank events

virtio-gpu sends vblank events in virtio_gpu_crtc_atomic_flush, and
because of that it must be called for disabled planes too.  Ask
drm_atomic_helper_commit_planes to do that.

v2: update to use new drm_atomic_helper_commit_planes() API.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Signed-off-by: NGustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: NDave Airlie <airlied@redhat.com>

drivers/gpu/drm/virtio/virtgpu_display.c

@@ -338,8 +338,7 @@ static void vgdev_atomic_commit_tail(struct drm_atomic_state *state)
 
 	drm_atomic_helper_commit_modeset_disables(dev, state);
 	drm_atomic_helper_commit_modeset_enables(dev, state);
-	drm_atomic_helper_commit_planes(dev, state,
-					DRM_PLANE_COMMIT_ACTIVE_ONLY);
+	drm_atomic_helper_commit_planes(dev, state, 0);
 
 	drm_atomic_helper_commit_hw_done(state);