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Commit 234abab1 authored by Sebastian Andrzej Siewior's avatar Sebastian Andrzej Siewior Committed by Greg Kroah-Hartman
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tty: serial: 8250_core: allow to set ->throttle / ->unthrottle callbacks 



The OMAP UART provides support for HW assisted flow control. What is
missing is the support to throttle / unthrottle callbacks which are used
by the omap-serial driver at the moment.
This patch adds the callbacks. It should be safe to add them since they
are only invoked from the serial_core (uart_throttle()) if the feature
flags are set.

Reviewed-by: default avatarTony Lindgren <tony@atomide.com>
Tested-by: default avatarTony Lindgren <tony@atomide.com>
Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent cc952e70

drivers/tty/serial/8250/8250_core.c

+14 −0
Original line number Diff line number Diff line
@@ -1319,6 +1319,16 @@ static void serial8250_start_tx(struct uart_port *port) 
	}

}



static void serial8250_throttle(struct uart_port *port)

{

	port->throttle(port);

}



static void serial8250_unthrottle(struct uart_port *port)

{

	port->unthrottle(port);

}



static void serial8250_stop_rx(struct uart_port *port)

{

	struct uart_8250_port *up = up_to_u8250p(port);
@@ -2912,6 +2922,8 @@ static struct uart_ops serial8250_pops = { 
	.get_mctrl	= serial8250_get_mctrl,

	.stop_tx	= serial8250_stop_tx,

	.start_tx	= serial8250_start_tx,

	.throttle	= serial8250_throttle,

	.unthrottle	= serial8250_unthrottle,

	.stop_rx	= serial8250_stop_rx,

	.enable_ms	= serial8250_enable_ms,

	.break_ctl	= serial8250_break_ctl,
@@ -3462,6 +3474,8 @@ int serial8250_register_8250_port(struct uart_8250_port *up) 
		uart->capabilities	= up->capabilities;

		uart->rs485_config	= up->rs485_config;

		uart->rs485		= up->rs485;

		uart->port.throttle	= up->port.throttle;

		uart->port.unthrottle	= up->port.unthrottle;



		/* Take tx_loadsz from fifosize if it wasn't set separately */

		if (uart->port.fifosize && !uart->tx_loadsz)

include/linux/serial_core.h

+2 −0
Original line number Diff line number Diff line
@@ -125,6 +125,8 @@ struct uart_port { 
				               struct ktermios *old);

	int			(*startup)(struct uart_port *port);

	void			(*shutdown)(struct uart_port *port);

	void			(*throttle)(struct uart_port *port);

	void			(*unthrottle)(struct uart_port *port);

	int			(*handle_irq)(struct uart_port *);

	void			(*pm)(struct uart_port *, unsigned int state,

				      unsigned int old);