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serial: omap: fix the reciever line error case

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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>
This commit is contained in:
Shubhrajyoti D 2012-09-21 20:07:19 +05:30 committed by Greg Kroah-Hartman
parent 65ecc9c02d
commit 9a12fcf8b1
1 changed files with 4 additions and 0 deletions
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4
drivers/tty/serial/omap-serial.c
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@ -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;