src_mgr_get_ctrl_blk
int (*src_mgr_get_ctrl_blk)(void **rblk);
.src_mgr_get_ctrl_blk = src_mgr_get_ctrl_blk,
.src_mgr_get_ctrl_blk = src_mgr_get_ctrl_blk,
err = hw->src_mgr_get_ctrl_blk(&mgr->ctrl_blk);