I915_WRITE(reg, val);
 }
 
-void skl_write_plane_wm(struct intel_crtc *intel_crtc,
-                       const struct skl_plane_wm *wm,
-                       const struct skl_ddb_allocation *ddb,
-                       int plane)
+static void skl_write_plane_wm(struct intel_crtc *intel_crtc,
+                              const struct skl_plane_wm *wm,
+                              const struct skl_ddb_allocation *ddb,
+                              int plane)
 {
        struct drm_crtc *crtc = &intel_crtc->base;
        struct drm_device *dev = crtc->dev;
                            &ddb->y_plane[pipe][plane]);
 }
 
-void skl_write_cursor_wm(struct intel_crtc *intel_crtc,
-                        const struct skl_plane_wm *wm,
-                        const struct skl_ddb_allocation *ddb)
+static void skl_write_cursor_wm(struct intel_crtc *intel_crtc,
+                               const struct skl_plane_wm *wm,
+                               const struct skl_ddb_allocation *ddb)
 {
        struct drm_crtc *crtc = &intel_crtc->base;
        struct drm_device *dev = crtc->dev;