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Subject[PATCH 01/16] tty: serial: 8250_core: allow to set ->throttle / ->unthrottle callbacks
Date
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: Tony Lindgren <tony@atomide.com>
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
drivers/tty/serial/8250/8250_core.c | 14 ++++++++++++++
include/linux/serial_core.h | 2 ++
2 files changed, 16 insertions(+)

diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index a0c1d64f34c5..68c44d97091b 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -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)
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 3bd7d55eebce..80936c68a7d3 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -124,6 +124,8 @@ 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);
--
2.1.0


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