drm_crtc_vblank_on(crtc);
 }
 
-static void exynos_drm_crtc_prepare(struct drm_crtc *crtc)
-{
-       /* drm framework doesn't check NULL. */
-}
-
 static void exynos_drm_crtc_commit(struct drm_crtc *crtc)
 {
        struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
 
 static struct drm_crtc_helper_funcs exynos_crtc_helper_funcs = {
        .dpms           = exynos_drm_crtc_dpms,
-       .prepare        = exynos_drm_crtc_prepare,
        .commit         = exynos_drm_crtc_commit,
        .mode_fixup     = exynos_drm_crtc_mode_fixup,
-       .mode_set       = drm_helper_crtc_mode_set,
        .mode_set_nofb  = exynos_drm_crtc_mode_set_nofb,
-       .mode_set_base  = drm_helper_crtc_mode_set_base,
        .disable        = exynos_drm_crtc_disable,
 };
 
 }
 
 static struct drm_crtc_funcs exynos_crtc_funcs = {
-       .set_config     = drm_crtc_helper_set_config,
+       .set_config     = drm_atomic_helper_set_config,
        .page_flip      = exynos_drm_crtc_page_flip,
        .destroy        = exynos_drm_crtc_destroy,
        .reset = drm_atomic_helper_crtc_reset,
 
                display->ops->mode_set(display, adjusted_mode);
 }
 
-static void exynos_drm_encoder_prepare(struct drm_encoder *encoder)
-{
-       /* drm framework doesn't check NULL. */
-}
-
 static void exynos_drm_encoder_commit(struct drm_encoder *encoder)
 {
        struct exynos_drm_encoder *exynos_encoder = to_exynos_encoder(encoder);
        .dpms           = exynos_drm_encoder_dpms,
        .mode_fixup     = exynos_drm_encoder_mode_fixup,
        .mode_set       = exynos_drm_encoder_mode_set,
-       .prepare        = exynos_drm_encoder_prepare,
        .commit         = exynos_drm_encoder_commit,
        .disable        = exynos_drm_encoder_disable,
 };