On Sat, Mar 4, 2017 at 5:58 AM, Sebastian Reichel <sre@xxxxxxxxxx> wrote:
> Add method, which waits until the transmission buffer has been sent.
>
> Signed-off-by: Sebastian Reichel <sre@xxxxxxxxxx>
> ---
> drivers/tty/serdev/core.c | 11 +++++++++++
> drivers/tty/serdev/serdev-ttyport.c | 15 ++++++++++++++-
> include/linux/serdev.h | 3 +++
> 3 files changed, 28 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
> index f4c6c90add78..a63b74031e22 100644
> --- a/drivers/tty/serdev/core.c
> +++ b/drivers/tty/serdev/core.c
> @@ -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);
> diff --git a/drivers/tty/serdev/serdev-ttyport.c b/drivers/tty/serdev/serdev-ttyport.c
> index d05393594f15..db2bc601e554 100644
> --- a/drivers/tty/serdev/serdev-ttyport.c
> +++ b/drivers/tty/serdev/serdev-ttyport.c
> @@ -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
>
> @@ -47,10 +48,13 @@ static void ttyport_write_wakeup(struct tty_port *port)
> struct serport *serport = serdev_controller_get_drvdata(ctrl);
>
> if (!test_and_clear_bit(TTY_DO_WRITE_WAKEUP, &port->tty->flags))
> - return;
> + goto out;
>
> if (test_bit(SERPORT_ACTIVE, &serport->flags))
> serdev_controller_write_wakeup(ctrl);
> +
> +out:
> + wake_up_interruptible_poll(&port->tty->write_wait, POLLOUT);
Shouldn't this be separate patch?
Rob
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