diff options
Diffstat (limited to 'drivers/tty/serial/st-asc.c')
| -rw-r--r-- | drivers/tty/serial/st-asc.c | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c index 105802099e47..e521078572b5 100644 --- a/drivers/tty/serial/st-asc.c +++ b/drivers/tty/serial/st-asc.c @@ -513,6 +513,8 @@ static void asc_set_termios(struct uart_port *port, struct ktermios *termios, struct ktermios *old) { struct asc_port *ascport = to_asc_port(port); + struct device_node *np = port->dev->of_node; + struct gpio_desc *gpiod; unsigned int baud; u32 ctrl_val; tcflag_t cflag; @@ -556,9 +558,32 @@ static void asc_set_termios(struct uart_port *port, struct ktermios *termios, ctrl_val |= ASC_CTL_PARITYODD; /* hardware flow control */ - if ((cflag & CRTSCTS)) + if ((cflag & CRTSCTS)) { ctrl_val |= ASC_CTL_CTSENABLE; + /* If flow-control selected, stop handling RTS manually */ + if (ascport->rts) { + devm_gpiod_put(port->dev, ascport->rts); + ascport->rts = NULL; + + pinctrl_select_state(ascport->pinctrl, + ascport->states[DEFAULT]); + } + } else { + /* If flow-control disabled, it's safe to handle RTS manually */ + if (!ascport->rts && ascport->states[NO_HW_FLOWCTRL]) { + pinctrl_select_state(ascport->pinctrl, + ascport->states[NO_HW_FLOWCTRL]); + + gpiod = devm_get_gpiod_from_child(port->dev, "rts", + &np->fwnode); + if (!IS_ERR(gpiod)) { + gpiod_direction_output(gpiod, 0); + ascport->rts = gpiod; + } + } + } + if ((baud < 19200) && !ascport->force_m1) { asc_out(port, ASC_BAUDRATE, (port->uartclk / (16 * baud))); } else { |