From: Johan Hovold <jhovold@gmail.com>
Date: Sun, 15 Jan 2012 23:36:52 +0000 (+0100)
Subject: USB: cp210x: initialise baud rate at open
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=cdc32fd6f7b2b2580d7f1b74563f888e4dd9eb8a;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

USB: cp210x: initialise baud rate at open

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>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index 2d2d23933ba6..5c3e8592fd22 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -417,6 +417,10 @@ 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);
 }