diff options
Diffstat (limited to 'drivers/tty/serial/st-asc.c')
| -rw-r--r-- | drivers/tty/serial/st-asc.c | 40 |
1 files changed, 24 insertions, 16 deletions
diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c index bbb5595d7e..a23e595518 100644 --- a/drivers/tty/serial/st-asc.c +++ b/drivers/tty/serial/st-asc.c @@ -465,6 +465,7 @@ static void asc_set_termios(struct uart_port *port, struct ktermios *termios, const struct ktermios *old) { struct asc_port *ascport = to_asc_port(port); + bool manual_rts, toggle_rts = false; struct gpio_desc *gpiod; unsigned int baud; u32 ctrl_val; @@ -518,25 +519,13 @@ static void asc_set_termios(struct uart_port *port, struct ktermios *termios, /* 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]); + toggle_rts = true; + manual_rts = false; } } 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_gpiod_get(port->dev, "rts", GPIOD_OUT_LOW); - if (!IS_ERR(gpiod)) { - gpiod_set_consumer_name(gpiod, - port->dev->of_node->name); - ascport->rts = gpiod; - } - } + if (!ascport->rts && ascport->states[NO_HW_FLOWCTRL]) + manual_rts = toggle_rts = true; } if ((baud < 19200) && !ascport->force_m1) { @@ -595,6 +584,25 @@ static void asc_set_termios(struct uart_port *port, struct ktermios *termios, asc_out(port, ASC_CTL, (ctrl_val | ASC_CTL_RUN)); uart_port_unlock_irqrestore(port, flags); + + if (toggle_rts) { + if (manual_rts) { + pinctrl_select_state(ascport->pinctrl, + ascport->states[NO_HW_FLOWCTRL]); + + gpiod = devm_gpiod_get(port->dev, "rts", GPIOD_OUT_LOW); + if (!IS_ERR(gpiod)) { + gpiod_set_consumer_name(gpiod, + port->dev->of_node->name); + ascport->rts = gpiod; + } + } else { + devm_gpiod_put(port->dev, ascport->rts); + ascport->rts = NULL; + pinctrl_select_state(ascport->pinctrl, + ascport->states[DEFAULT]); + } + } } static const char *asc_type(struct uart_port *port) |