The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 03a58ea5905fdbd93ff9e52e670d802600ba38cd Mon Sep 17 00:00:00 2001
From: Kent Gibson <warthog618@xxxxxxxxx>
Date: Thu, 21 Jan 2021 22:10:38 +0800
Subject: [PATCH] gpiolib: cdev: clear debounce period if line set to output
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@xxxxxxxxxxxxxxx
Signed-off-by: Kent Gibson <warthog618@xxxxxxxxx>
Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c
index 1a7b51163528..1631727bf0da 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() */
}
