From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Hans de Goede <hdegoede@redhat.com>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>,
Linus Walleij <linus.walleij@linaro.org>,
linux-gpio@vger.kernel.org, linux-acpi@vger.kernel.org
Subject: Re: [PATCH regression fix v2] gpiolib: acpi: Make set-debounce-timeout failures non fatal
Date: Mon, 16 Aug 2021 15:15:02 +0300 [thread overview]
Message-ID: <YRpWxnZvM2kzjcX/@smile.fi.intel.com> (raw)
In-Reply-To: <20210816104119.75019-1-hdegoede@redhat.com>
On Mon, Aug 16, 2021 at 12:41:19PM +0200, Hans de Goede wrote:
> Commit 8dcb7a15a585 ("gpiolib: acpi: Take into account debounce settings")
> made the gpiolib-acpi code call gpio_set_debounce_timeout() when requesting
> GPIOs.
>
> This in itself is fine, but it also made gpio_set_debounce_timeout()
> errors fatal, causing the requesting of the GPIO to fail. This is causing
> regressions. E.g. on a HP ElitePad 1000 G2 various _AEI specified GPIO
> ACPI event sources specify a debouncy timeout of 20 ms, but the
> pinctrl-baytrail.c only supports certain fixed values, the closest
> ones being 12 or 24 ms and pinctrl-baytrail.c responds with -EINVAL
> when specified a value which is not one of the fixed values.
>
> This is causing the acpi_request_own_gpiod() call to fail for 3
> ACPI event sources on the HP ElitePad 1000 G2, which in turn is causing
> e.g. the battery charging vs discharging status to never get updated,
> even though a charger has been plugged-in or unplugged.
>
> Make gpio_set_debounce_timeout() errors non fatal, warning about the
> failure instead, to fix this regression.
>
> Note we should probably also fix various pinctrl drivers to just
> pick the first bigger discrete value rather then returning -EINVAL but
> this will need to be done on a per driver basis, where as this fix
> at least gets us back to where things were before and thus restores
> functionality on devices where this was lost due to
> gpio_set_debounce_timeout() errors.
Yes, I also think that we need to choose upper debounce instead of rejecting
the settings. And yes, I agree that for now it's not suitable as a fix.
That said,
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Fixes: 8dcb7a15a585 ("gpiolib: acpi: Take into account debounce settings")
> Depends-on: 2e2b496cebef ("gpiolib: acpi: Extract acpi_request_own_gpiod() helper")
> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> ---
> Changes in v2:
> -Fix typo in commit msg
> -Add Mika's Reviewed-by
> -Add Depends-on tag
> ---
> drivers/gpio/gpiolib-acpi.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
> index 411525ac4cc4..47712b6903b5 100644
> --- a/drivers/gpio/gpiolib-acpi.c
> +++ b/drivers/gpio/gpiolib-acpi.c
> @@ -313,9 +313,11 @@ static struct gpio_desc *acpi_request_own_gpiod(struct gpio_chip *chip,
>
> ret = gpio_set_debounce_timeout(desc, agpio->debounce_timeout);
> if (ret)
> - gpiochip_free_own_desc(desc);
> + dev_warn(chip->parent,
> + "Failed to set debounce-timeout for pin 0x%04X, err %d\n",
> + pin, ret);
>
> - return ret ? ERR_PTR(ret) : desc;
> + return desc;
> }
>
> static bool acpi_gpio_in_ignore_list(const char *controller_in, int pin_in)
> --
> 2.31.1
>
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2021-08-16 12:15 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-16 10:41 [PATCH regression fix v2] gpiolib: acpi: Make set-debounce-timeout failures non fatal Hans de Goede
2021-08-16 12:15 ` Andy Shevchenko [this message]
2021-08-16 12:28 ` Hans de Goede
2021-08-23 9:41 ` Andy Shevchenko
2021-09-20 14:43 ` Hans de Goede
2021-09-21 12:13 ` Andy Shevchenko
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=YRpWxnZvM2kzjcX/@smile.fi.intel.com \
--to=andriy.shevchenko@linux.intel.com \
--cc=hdegoede@redhat.com \
--cc=linus.walleij@linaro.org \
--cc=linux-acpi@vger.kernel.org \
--cc=linux-gpio@vger.kernel.org \
--cc=mika.westerberg@linux.intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).