atmel_serial: fix RTS high after initialization in RS485 mode

When working in RS485 mode, the atmel_serial driver keeps RTS high after
the initialization of the serial port.  It goes low only after the first
character has been sent.

[akpm@linux-foundation.org: simplify code]
Signed-off-by: Claudio Scordino <claudio@evidence.eu.com>
Signed-off-by: Arkadiusz Bubala <arkadiusz.bubala@gmail.com>
Tested-by: Arkadiusz Bubala <arkadiusz.bubala@gmail.com>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c
index 3892666..2a1d52f 100644 (file)
--- a/drivers/serial/atmel_serial.c
+++ b/drivers/serial/atmel_serial.c
@@ -1732,6 +1732,11 @@ static int __devinit atmel_serial_probe(struct platform_device *pdev)
        device_init_wakeup(&pdev->dev, 1);
        platform_set_drvdata(pdev, port);
 
+       if (port->rs485.flags & SER_RS485_ENABLED) {
+               UART_PUT_MR(&port->uart, ATMEL_US_USMODE_NORMAL);
+               UART_PUT_CR(&port->uart, ATMEL_US_RTSEN);
+       }
+
        return 0;
 
 err_add_port: