mdp4_crtc_vblank
mdp4_crtc_vblank(crtc), false);
if (status & mdp4_crtc_vblank(crtc))
mdp4_crtc_vblank(crtc), true);
uint32_t mdp4_crtc_vblank(struct drm_crtc *crtc);