timeval_to_ns
diff_ns = timeval_to_ns(&tvblank) -
diff_ns = timeval_to_ns(&tvblank) -
timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount));
timeval_to_ns(&vblanktimestamp(dev, crtc, vblcount));
duration_ns = timeval_to_ns(&raw_time) - timeval_to_ns(&stime);
*vblank_time = ns_to_timeval(timeval_to_ns(&raw_time) - delta_ns);
int64_t timeval_to_ns(const struct timeval *tv);