[PATCH v2] serial: samsung: add support for manual RTS setting

[José Miguel Gonçalves]

The Samsung serial driver currently does not support setting the
RTS pin with an ioctl(TIOCMSET) call. This patch adds this support.

Changes in v2:
 - Preserve the RTS pin's manual setting  in set_termios() also when
   enabling CRTSCTS.

Signed-off-by: José Miguel Gonçalves <jose.goncal...@inov.pt>
---
 drivers/tty/serial/samsung.c |   20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index f3dfa19..401ef4f 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -407,7 +407,14 @@ static unsigned int s3c24xx_serial_get_mctrl(struct 
uart_port *port)
 
 static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int 
mctrl)
 {
-       /* todo - possibly remove AFC and do manual CTS */
+       unsigned int umcon = rd_regl(port, S3C2410_UMCON);
+
+       if (mctrl & TIOCM_RTS)
+               umcon |= S3C2410_UMCOM_RTS_LOW;
+       else
+               umcon &= ~S3C2410_UMCOM_RTS_LOW;
+
+       wr_regl(port, S3C2410_UMCON, umcon);
 }
 
 static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state)
@@ -774,8 +781,6 @@ static void s3c24xx_serial_set_termios(struct uart_port 
*port,
        if (termios->c_cflag & CSTOPB)
                ulcon |= S3C2410_LCON_STOPB;
 
-       umcon = (termios->c_cflag & CRTSCTS) ? S3C2410_UMCOM_AFC : 0;
-
        if (termios->c_cflag & PARENB) {
                if (termios->c_cflag & PARODD)
                        ulcon |= S3C2410_LCON_PODD;
@@ -792,6 +797,15 @@ static void s3c24xx_serial_set_termios(struct uart_port 
*port,
 
        wr_regl(port, S3C2410_ULCON, ulcon);
        wr_regl(port, S3C2410_UBRDIV, quot);
+
+       umcon = rd_regl(port, S3C2410_UMCON);
+       if (termios->c_cflag & CRTSCTS) {
+               umcon |= S3C2410_UMCOM_AFC;
+               /* Disable RTS when RX FIFO contains 63 bytes */
+               umcon &= ~S3C2412_UMCON_AFC_8;
+       } else {
+               umcon &= ~S3C2410_UMCOM_AFC;
+       }
        wr_regl(port, S3C2410_UMCON, umcon);
 
        if (ourport->info->has_divslot)
-- 
1.7.10.4

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