From 9a12fcf8b1543c99ffcec3d61db86f0dea52dc9d Mon Sep 17 00:00:00 2001
From: Shubhrajyoti D <shubhrajyoti@ti.com>
Date: Fri, 21 Sep 2012 20:07:19 +0530
Subject: [PATCH] serial: omap: fix the reciever line error case
This patch does the following
- In case of errors if there least one data character in the RX FIFO
read it otherwise it may stall the receiver.
This is recommended in the interrupt reset method in the table 23-246 of
the omap4 TRM.
Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com>
Reviewed-by: Felipe Balbi <balbi@ti.com>
Tested-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/tty/serial/omap-serial.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 3c05c5ecdfbf..ccc2f35adff1 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -334,6 +334,10 @@ static unsigned int check_modem_status(struct uart_omap_port *up)
static void serial_omap_rlsi(struct uart_omap_port *up, unsigned int lsr)
{
unsigned int flag;
+ unsigned char ch = 0;
+
+ if (likely(lsr & UART_LSR_DR))
+ ch = serial_in(up, UART_RX);
up->port.icount.rx++;
flag = TTY_NORMAL;
--
2.34.1