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serdev: add serdev_device_wait_until_sent

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Add method, which waits until the transmission buffer has been sent.
Note, that the change in ttyport_write_wakeup is related, since
tty_wait_until_sent will hang without that change.

Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Sebastian Reichel
2017-03-28 17:59:31 +02:00
committed by Marcel Holtmann
parent 2f09276769
commit b3f80c8f75
3 changed files with 28 additions and 4 deletions
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drivers/tty/serdev/core.c
+11
View File
@@ -173,6 +173,17 @@ void serdev_device_set_flow_control(struct serdev_device *serdev, bool enable)
}
EXPORT_SYMBOL_GPL(serdev_device_set_flow_control);
void serdev_device_wait_until_sent(struct serdev_device *serdev, long timeout)
{
struct serdev_controller *ctrl = serdev->ctrl;
if (!ctrl || !ctrl->ops->wait_until_sent)
return;
ctrl->ops->wait_until_sent(ctrl, timeout);
}
EXPORT_SYMBOL_GPL(serdev_device_wait_until_sent);
static int serdev_drv_probe(struct device *dev)
{
const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver);
drivers/tty/serdev/serdev-ttyport.c
+14 -4
View File
@@ -14,6 +14,7 @@
#include <linux/serdev.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/poll.h>
#define SERPORT_ACTIVE 1
@@ -46,11 +47,11 @@ static void ttyport_write_wakeup(struct tty_port *port)
struct serdev_controller *ctrl = port->client_data;
struct serport *serport = serdev_controller_get_drvdata(ctrl);
if (!test_and_clear_bit(TTY_DO_WRITE_WAKEUP, &port->tty->flags))
return;
if (test_bit(SERPORT_ACTIVE, &serport->flags))
if (test_and_clear_bit(TTY_DO_WRITE_WAKEUP, &port->tty->flags) &&
test_bit(SERPORT_ACTIVE, &serport->flags))
serdev_controller_write_wakeup(ctrl);
wake_up_interruptible_poll(&port->tty->write_wait, POLLOUT);
}
static const struct tty_port_client_operations client_ops = {
@@ -167,6 +168,14 @@ static void ttyport_set_flow_control(struct serdev_controller *ctrl, bool enable
tty_set_termios(tty, &ktermios);
}
static void ttyport_wait_until_sent(struct serdev_controller *ctrl, long timeout)
{
struct serport *serport = serdev_controller_get_drvdata(ctrl);
struct tty_struct *tty = serport->tty;
tty_wait_until_sent(tty, timeout);
}
static const struct serdev_controller_ops ctrl_ops = {
.write_buf = ttyport_write_buf,
.write_flush = ttyport_write_flush,
@@ -175,6 +184,7 @@ static const struct serdev_controller_ops ctrl_ops = {
.close = ttyport_close,
.set_flow_control = ttyport_set_flow_control,
.set_baudrate = ttyport_set_baudrate,
.wait_until_sent = ttyport_wait_until_sent,
};
struct device *serdev_tty_port_register(struct tty_port *port,