serial: omap: add the functionality of a 9-bit UART with userspaces CMSPAR

Some systems require the additional communication functionality of a
9-bit UART. For that we could use the "stick" (mark/space) parity
bit supported on omap serial device. When is set, if PARODD is set the
parity bit is always 1; if PARODD is not set, then the parity bit is
always 0.

Signed-off-by: Enric Balletbo i Serra <eballetbo@iseebcn.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 57d6b29c039c..ec90651d661a 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -776,6 +776,8 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
                 cval |= UART_LCR_PARITY;
         if (!(termios->c_cflag & PARODD))
                 cval |= UART_LCR_EPAR;
+        if (termios->c_cflag & CMSPAR)
+                cval |= UART_LCR_SPAR;
 
         /*
          * Ask the core to calculate the divisor for us.