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Commit 45564a66 authored by Huang Shijie's avatar Huang Shijie Committed by Greg Kroah-Hartman
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serial: imx: terminate the RX DMA when the UART is suspending 



When the uart port is suspending, the RX data is useless.
So in this case, we can terminate the RX DMA right now.

Signed-off-by: default avatarHuang Shijie <b32955@freescale.com>
Signed-off-by: default avatarFugang Duan <B38611@freescale.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent bb2f861a

drivers/tty/serial/imx.c

+8 −6
Original line number Diff line number Diff line
@@ -436,12 +436,14 @@ static void imx_stop_rx(struct uart_port *port) 
	struct imx_port *sport = (struct imx_port *)port;

	unsigned long temp;



	/*

	 * We are maybe in the SMP context, so if the DMA TX thread is running

	 * on other cpu, we have to wait for it to finish.

	 */

	if (sport->dma_is_enabled && sport->dma_is_rxing)

	if (sport->dma_is_enabled && sport->dma_is_rxing) {

		if (sport->port.suspended) {

			dmaengine_terminate_all(sport->dma_chan_rx);

			sport->dma_is_rxing = 0;

		} else {

			return;

		}

	}



	temp = readl(sport->port.membase + UCR2);

	writel(temp & ~UCR2_RXEN, sport->port.membase + UCR2);