On Fri, May 23, 2014 at 08:10:36AM +0200, Dirk Behme wrote:

On 23.05.2014 06:32, Huang Shijie wrote:

quoted

This patch disables the receiver ready interrupt for imx_stop_rx.
It reduces the interrupt numbers when the uart is going to close
or suspend.

Signed-off-by: Huang Shijie <redacted>
---
 drivers/tty/serial/imx.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index ed6cdf7..6026101 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c

@@ -440,6 +440,10 @@ static void imx_stop_rx(struct uart_port *port)

 	temp = readl(sport->port.membase + UCR2);
 	writel(temp & ~UCR2_RXEN, sport->port.membase + UCR2);
+
+	/* disable the `Receiver Ready Interrrupt` */
+	temp = readl(sport->port.membase + UCR1);
+	writel(temp & ~UCR1_RRDYEN, sport->port.membase + UCR1);
 }

While this is about the RX irq, I've a slightly off-topic general
question regarding the usage of the *TX* irq in TX DMA mode:

It seems to me that the TX irq is kept enabled while the TX DMA is

Not really :)

We disable the TXMPTYEN when the DMA is enabled.

thanks
Huang Shijie