diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 69cbab5e5c81f29008247776d81447f21aede835..1e103c4c6ee056d5011178bbbe8675d490f94a8f 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -1251,7 +1251,7 @@ static int pan_display_atomic(struct fb_var_screeninfo *var,
 			goto fail;
 
 		plane = mode_set->crtc->primary;
-		plane_mask |= drm_plane_index(plane);
+		plane_mask |= (1 << drm_plane_index(plane));
 		plane->old_fb = plane->fb;
 	}