From: Johan Hovold Date: Sun, 4 Jun 2023 12:35:04 +0000 (+0200) Subject: USB: serial: cp210x: disable break signalling on CP2105 SCI X-Git-Tag: v6.6.7~2446^2~5^2~2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f4bbae27b32ea0ffb9e25931b9769600e8d8a664;p=platform%2Fkernel%2Flinux-starfive.git USB: serial: cp210x: disable break signalling on CP2105 SCI Only the first UART interface (ECI) on CP2105 supports break signalling. Return an error on requests for break state changes for the second interface (SCI) to avoid transmitting a garbage character and waiting when break is not supported. Tested-by: Corey Minyard Signed-off-by: Johan Hovold --- diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c index 81e49ed..1e61fe0 100644 --- a/drivers/usb/serial/cp210x.c +++ b/drivers/usb/serial/cp210x.c @@ -1437,8 +1437,14 @@ static int cp210x_tiocmget(struct tty_struct *tty) static int cp210x_break_ctl(struct tty_struct *tty, int break_state) { struct usb_serial_port *port = tty->driver_data; + struct cp210x_serial_private *priv = usb_get_serial_data(port->serial); u16 state; + if (priv->partnum == CP210X_PARTNUM_CP2105) { + if (cp210x_interface_num(port->serial) == 1) + return -ENOTTY; + } + if (break_state == 0) state = BREAK_OFF; else