serial: imx: Add Rx Fifo overrun error message
This patch enables the overrun error (ORE) interrupt and increases the
counter in case of overrun.
Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 147c9e1..72bc1db 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -449,6 +449,13 @@
temp &= ~(UCR1_RRDYEN);
writel(temp, sport->port.membase + UCR1);
}
+ /* Clear any pending ORE flag before enabling interrupt */
+ temp = readl(sport->port.membase + USR2);
+ writel(temp | USR2_ORE, sport->port.membase + USR2);
+
+ temp = readl(sport->port.membase + UCR4);
+ temp |= UCR4_OREN;
+ writel(temp, sport->port.membase + UCR4);
temp = readl(sport->port.membase + UCR1);
writel(temp | UCR1_TXMPTYEN, sport->port.membase + UCR1);
@@ -582,6 +589,7 @@
{
struct imx_port *sport = dev_id;
unsigned int sts;
+ unsigned int sts2;
sts = readl(sport->port.membase + USR1);
@@ -598,6 +606,13 @@
if (sts & USR1_AWAKE)
writel(USR1_AWAKE, sport->port.membase + USR1);
+ sts2 = readl(sport->port.membase + USR2);
+ if (sts2 & USR2_ORE) {
+ dev_err(sport->port.dev, "Rx FIFO overrun\n");
+ sport->port.icount.overrun++;
+ writel(sts2 | USR2_ORE, sport->port.membase + USR2);
+ }
+
return IRQ_HANDLED;
}