USB: cp210x: initialise baud rate at open

commit cdc32fd6f7b2b2580d7f1b74563f888e4dd9eb8a upstream.

The newer cp2104 devices require the baud rate to be initialised after
power on. Make sure it is set when port is opened.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Cc: Preston Fick <preston.fick@silabs.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index d2c40801ed8556189c5e10ea3bec09a766f7ec0d..07d297f5fe42a89fc8d1203212467238a9d998f3 100644 (file)
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -408,6 +408,10 @@ static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
        /* Configure the termios structure */
        cp210x_get_termios(tty, port);
 
+       /* The baud rate must be initialised on cp2104 */
+       if (tty)
+               cp210x_change_speed(tty, port, NULL);
+
        return usb_serial_generic_open(tty, port);
 }