int mtk_drm_crtc_enable_vblank(struct drm_device *drm, unsigned int pipe);
void mtk_drm_crtc_disable_vblank(struct drm_device *drm, unsigned int pipe);
-void mtk_drm_crtc_check_flush(struct drm_crtc *crtc);
void mtk_drm_crtc_commit(struct drm_crtc *crtc);
void mtk_crtc_ddp_irq(struct drm_crtc *crtc, struct mtk_ddp_comp *ovl);
int mtk_drm_crtc_create(struct drm_device *drm_dev,