src_set_vo
int (*src_set_vo)(void *blk, unsigned int vo);
.src_set_vo = src_set_vo,
.src_set_vo = src_set_vo,
hw->src_set_vo(src->rsc.ctrl_blk, 0);
hw->src_set_vo(src->rsc.ctrl_blk, 0);
hw->src_set_vo(src->rsc.ctrl_blk, 0);
.set_vo = src_set_vo,
hw->src_set_vo(src->rsc.ctrl_blk, vo);