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USB: serial: xr: fix gpio-mode handling 

Fix the gpio-mode handling so that all the pins are under driver control
(i.e. in gpio mode) when hardware flow control is disabled.

This is specifically needed to be able to control RTS.

Fixes: c2d405aa86 ("USB: serial: add MaxLinear/Exar USB to Serial driver")
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Johan Hovold 2021-01-21 11:29:20 +01:00
parent 736c09316c
commit 465d3b3a0d
1 changed files with 3 additions and 6 deletions
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9
drivers/usb/serial/xr_serial.c
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@ -408,14 +408,11 @@ static void xr_set_flow_mode(struct tty_struct *tty,
if (ret)
return;
/* Set GPIO mode for controlling the pins manually by default. */
gpio_mode &= ~XR21V141X_UART_MODE_GPIO_MASK;
if (C_CRTSCTS(tty)) {
dev_dbg(&port->dev, "Enabling hardware flow ctrl\n");
/*
* RTS/CTS is the default flow control mode, so set GPIO mode
* for controlling the pins manually by default.
*/
gpio_mode &= ~XR21V141X_UART_MODE_GPIO_MASK;
gpio_mode |= XR21V141X_UART_MODE_RTS_CTS;
flow = XR21V141X_UART_FLOW_MODE_HW;
} else if (I_IXON(tty)) {