mdc_chan_writel
mdc_chan_writel(mchan, val, MDC_GENERAL_CONFIG);
mdc_chan_writel(mchan, val, MDC_READ_PORT_CONFIG);
mdc_chan_writel(mchan, mdesc->list_phys, MDC_LIST_NODE_ADDRESS);
mdc_chan_writel(mchan, val, MDC_CONTROL_AND_STATUS);
mdc_chan_writel(mchan, val, MDC_CMDS_PROCESSED);
mdc_chan_writel(mchan, MDC_CONTROL_AND_STATUS_CANCEL,