nv_crtc2_update_fifo
if (si->ps.secondary_head) nv_crtc2_update_fifo();
head1_update_fifo = (crtc_update_fifo) nv_crtc2_update_fifo;
head2_update_fifo = (crtc_update_fifo) nv_crtc2_update_fifo;
status_t nv_crtc2_update_fifo(void);