serial: imx: Fix clearing of receiver overrun flag
The writeable bits in the USR2 register are all "write 1 to
clear" so only write the bits that actually should be cleared.
Fixes: f1f836e4209e ("serial: imx: Add Rx Fifo overrun error message")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index ca00b3f..0f2afae 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -818,7 +818,7 @@
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);
+ writel(USR2_ORE, sport->port.membase + USR2);
}
return IRQ_HANDLED;
@@ -1181,10 +1181,12 @@
imx_uart_dma_init(sport);
spin_lock_irqsave(&sport->port.lock, flags);
+
/*
* Finally, clear and enable interrupts
*/
writel(USR1_RTSD, sport->port.membase + USR1);
+ writel(USR2_ORE, sport->port.membase + USR2);
if (sport->dma_is_inited && !sport->dma_is_enabled)
imx_enable_dma(sport);
@@ -1199,10 +1201,6 @@
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);