On 04/10/2016 07:14 AM, Peter Hurley wrote:
> --- a/drivers/tty/serial/8250/8250_dma.c
> +++ b/drivers/tty/serial/8250/8250_dma.c
> @@ -201,6 +201,15 @@ int serial8250_request_dma(struct uart_8250_port *p)
> goto release_rx;
> }
>
> + /* 8250 tx dma requires dmaengine driver to support terminate */
> + ret = dma_get_slave_caps(dma->txchan, &caps);
> + if (ret)
> + goto err;
> + if (!caps.cmd_terminate) {
> + ret = -EINVAL;
> + goto err;
> + }
So you want to be able to terminate the TX transfer instead of waiting
for its completion because with flow control you could wait for ever?
> +
> dmaengine_slave_config(dma->txchan, &dma->txconf);
>
> /* RX buffer */
Sebastian
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