drm_crtc_vblank_count_and_time
EXPORT_SYMBOL(drm_crtc_vblank_count_and_time);
cur_count = drm_crtc_vblank_count_and_time(crtc, &cur_time);
} while (cur_count != drm_crtc_vblank_count_and_time(crtc, &cur_time));
u64 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc,