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>
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 3c05c5e..ccc2f35 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -334,6 +334,10 @@
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;