From: Huang Shijie <shijie8@xxxxxxxxx>
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: Huang Shijie <b32955@xxxxxxxxxxxxx>
Signed-off-by: Fugang Duan <B38611@xxxxxxxxxxxxx>
---
drivers/tty/serial/imx.c | 14 ++++++++------
1 files changed, 8 insertions(+), 6 deletions(-)
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 070a37e..a9f63b2 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -435,12 +435,14 @@ 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)
- return;
+ 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);
--
1.7.8
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