linux-kernel - Re: [PATCH] gpiolib: cdev: clear debounce period if line set to output

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Message-ID: <CAMpxmJWHzU7NM950gLx3dJB5ap07J8VRw1GCO-LfNnOOO1vevg@mail.gmail.com>
Date:   Wed, 27 Jan 2021 15:51:36 +0100
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     Kent Gibson <warthog618@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        linux-gpio <linux-gpio@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH] gpiolib: cdev: clear debounce period if line set to output

On Thu, Jan 21, 2021 at 3:11 PM Kent Gibson <warthog618@...il.com> wrote:
>
> When set_config changes a line from input to output debounce is
> implicitly disabled, as debounce makes no sense for outputs, but the
> debounce period is not being cleared and is still reported in the
> line info.
>
> So clear the debounce period when the debouncer is stopped in
> edge_detector_stop().
>
> Fixed: 65cff7047640 ("gpiolib: cdev: support setting debounce")

The actual hash for this commit is 65cff7046406 - I fixed that locally.

Patch applied for fixes, thanks!

Bartosz

> Signed-off-by: Kent Gibson <warthog618@...il.com>
> ---
>  drivers/gpio/gpiolib-cdev.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c
> index 12b679ca552c..3551aaf5a361 100644
> --- a/drivers/gpio/gpiolib-cdev.c
> +++ b/drivers/gpio/gpiolib-cdev.c
> @@ -776,6 +776,8 @@ static void edge_detector_stop(struct line *line)
>         cancel_delayed_work_sync(&line->work);
>         WRITE_ONCE(line->sw_debounced, 0);
>         WRITE_ONCE(line->eflags, 0);
> +       if (line->desc)
> +               WRITE_ONCE(line->desc->debounce_period_us, 0);
>         /* do not change line->level - see comment in debounced_value() */
>  }
>
> --
> 2.30.0
>