return NULL;
 }
 
-int intel_plane_atomic_check(struct intel_atomic_state *state,
-                            struct intel_plane *plane)
+static int plane_atomic_check(struct intel_atomic_state *state,
+                             struct intel_plane *plane)
 {
        struct intel_display *display = to_intel_display(state);
        struct intel_plane_state *new_plane_state =
                return ret;
 
        for_each_new_intel_plane_in_state(state, plane, plane_state, i) {
-               ret = intel_plane_atomic_check(state, plane);
+               ret = plane_atomic_check(state, plane);
                if (ret) {
                        drm_dbg_atomic(display->drm,
                                       "[PLANE:%d:%s] atomic driver check failed\n",
 
                                        struct intel_crtc_state *crtc_state,
                                        const struct intel_plane_state *old_plane_state,
                                        struct intel_plane_state *intel_state);
-int intel_plane_atomic_check(struct intel_atomic_state *state,
-                            struct intel_plane *plane);
 int intel_plane_calc_min_cdclk(struct intel_atomic_state *state,
                               struct intel_plane *plane,
                               bool *need_cdclk_calc);