Commit 234abab1 authored by Sebastian Andrzej Siewior's avatar Sebastian Andrzej Siewior Committed by Greg Kroah-Hartman

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
......@@ -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)
......
......@@ -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);
......
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