MXC_ISI_BUF1
if (buf_id == MXC_ISI_BUF1) {
mxc_isi_channel_set_outbuf(m2m->pipe, dst_buf->dma_addrs, MXC_ISI_BUF1);
? (status & CHNL_STS_BUF1_ACTIVE ? MXC_ISI_BUF2 : MXC_ISI_BUF1)
: (status & CHNL_STS_BUF1_ACTIVE ? MXC_ISI_BUF1 : MXC_ISI_BUF2);
enum mxc_isi_buf_id buf_id = i == 0 ? MXC_ISI_BUF1