[PATCH 5.10 17/54] gpiolib: cdev: clear debounce period if line set to output

Greg Kroah-Hartman
2021-02-11T16:20:35Z

From: Kent Gibson <warthog618@gmail.com>

commit 03a58ea5905fdbd93ff9e52e670d802600ba38cd upstream.

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().

Fixes: 65cff7046406 ("gpiolib: cdev: support setting debounce")
Cc: stable@vger.kernel.org
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpio/gpiolib-cdev.c | 2 ++
1 file changed, 2 insertions(+)

--- a/drivers/gpio/gpiolib-cdev.c
+++ b/drivers/gpio/gpiolib-cdev.c
@@ -756,6 +756,8 @@ static void edge_detector_stop(struct li
cancel_delayed_work_sync(&line->work);
WRITE_ONCE(line->sw_debounced, 0);
line->eflags = 0;
+ if (line->desc)
+ WRITE_ONCE(line->desc->debounce_period_us, 0);
/* do not change line->level - see comment in debounced_value() */
}