atiixp_chan_setformat
atiixp_chan_setformat(NULL, &sc->pch, sc->pch.fmt);
atiixp_chan_setformat(NULL, &sc->rch, sc->rch.fmt);
static int atiixp_chan_setformat(kobj_t, void *, uint32_t);
KOBJMETHOD(channel_setformat, atiixp_chan_setformat),