drm_vblank_count_and_time
extern u32 drm_vblank_count_and_time(struct drm_device *dev, int crtc,
seq = drm_vblank_count_and_time(dev, pipe, &now);
reply_seq = drm_vblank_count_and_time(dev, crtc, &now);
seq = drm_vblank_count_and_time(dev, crtc, &now);
EXPORT_SYMBOL(drm_vblank_count_and_time);
seq = drm_vblank_count_and_time(dev, crtc, &now);
seq = drm_vblank_count_and_time(dev, crtc, &now);