get_chan_max_dw
u32 dw = get_chan_max_dw(ddata->ports_max_dw[0], chan->max_burst); /* port 0 by default */
enum dma_slave_buswidth max_dw = get_chan_max_dw(port_max_dw, chan_max_burst);
sdw = chan->dma_config.src_addr_width ? : get_chan_max_dw(sap, chan->max_burst);
ddw = chan->dma_config.dst_addr_width ? : get_chan_max_dw(dap, chan->max_burst);