From 2cbacafd7af0f1cc7a433668c662a91ba6aabc1b Mon Sep 17 00:00:00 2001 From: Russell King Date: Tue, 17 Apr 2012 16:34:13 +0100 Subject: SERIAL: core: add hardware assisted s/w flow control support Ports which are capable of handling s/w flow control in hardware to know when the s/w flow control termios settings are changed. Add a flag to allow the low level serial drivers to indicate that they support this, and these changes should be propagated to them. Acked-by: Alan Cox Signed-off-by: Russell King --- drivers/tty/serial/serial_core.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) (limited to 'drivers/tty') diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index bc2065d323b9..bd10bbd56446 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -1213,7 +1213,19 @@ static void uart_set_termios(struct tty_struct *tty, struct uart_port *uport = state->uart_port; unsigned long flags; unsigned int cflag = tty->termios.c_cflag; + unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK; + bool sw_changed = false; + /* + * Drivers doing software flow control also need to know + * about changes to these input settings. + */ + if (uport->flags & UPF_SOFT_FLOW) { + iflag_mask |= IXANY|IXON|IXOFF; + sw_changed = + tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] || + tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP]; + } /* * These are the bits that are used to setup various @@ -1221,11 +1233,11 @@ static void uart_set_termios(struct tty_struct *tty, * bits in c_cflag; c_[io]speed will always be set * appropriately by set_termios() in tty_ioctl.c */ -#define RELEVANT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) if ((cflag ^ old_termios->c_cflag) == 0 && tty->termios.c_ospeed == old_termios->c_ospeed && tty->termios.c_ispeed == old_termios->c_ispeed && - RELEVANT_IFLAG(tty->termios.c_iflag ^ old_termios->c_iflag) == 0) { + ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 && + !sw_changed) { return; } -- cgit v1.2.3