[87/89] USB: cp210x: initialise baud rate at open

From: Greg KH
Date: Wed Feb 01 2012 - 16:21:59 EST

3.2-stable review patch. If anyone has any objections, please let me know.


From: Johan Hovold <jhovold@xxxxxxxxx>

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@xxxxxxxxx>
Cc: Preston Fick <preston.fick@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

drivers/usb/serial/cp210x.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -408,6 +408,10 @@ static int cp210x_open(struct tty_struct
/* 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);

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