drm/armada: wait for previous work when moving overlay window

We must wait for the previous plane work to complete before moving
the overlay window, as it could overwrite our positioning update.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

drivers/gpu/drm/armada/armada_overlay.c

@@ -239,16 +239,16 @@ armada_ovl_plane_update(struct drm_plane *plane, struct drm_crtc *crtc,
 	if (!dplane->base.state.changed)
 		return 0;
 
+	/* Wait for pending work to complete */
+	if (armada_drm_plane_work_wait(&dplane->base, HZ / 25) == 0)
+		armada_drm_plane_work_cancel(dcrtc, &dplane->base);
+
 	/* Just updating the position/size? */
 	if (!dplane->base.state.vsync_update) {
 		armada_ovl_plane_work(dcrtc, work);
 		return 0;
 	}
 
-	/* Wait for pending work to complete */
-	if (armada_drm_plane_work_wait(&dplane->base, HZ / 25) == 0)
-		armada_drm_plane_work_cancel(dcrtc, &dplane->base);
-
 	if (!dcrtc->plane) {
 		dcrtc->plane = plane;
 		armada_ovl_update_attr(&dplane->prop, dcrtc);