From: Hans de Goede <hdegoede@redhat.com>
To: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Linus Walleij <linus.walleij@linaro.org>,
linux-gpio@vger.kernel.org, linux-acpi@vger.kernel.org
Subject: Re: [PATCH regression fix] gpiolib: acpi: Make set-debounce-timeout failures non fatal
Date: Mon, 16 Aug 2021 12:39:15 +0200 [thread overview]
Message-ID: <a776fdc8-782b-5452-d1e4-3792cecacdf7@redhat.com> (raw)
In-Reply-To: <YRo9A0sgfKbi94BK@lahna>
Hi,
On 8/16/21 12:25 PM, Mika Westerberg wrote:
> On Mon, Aug 16, 2021 at 11:38:56AM +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 14 ms and pinctrl-baytrail.c responds with -EINVAL
Type 14 should be 24.
>> 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.
>>
>> Fixes: 8dcb7a15a585 ("gpiolib: acpi: Take into account debounce settings")
>> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
>
> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Thanks, I'll send a v2 with the typo fixed and your Reviewed-by added.
Regards,
Hans
next prev parent reply other threads:[~2021-08-16 10:39 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-16 9:38 [PATCH regression fix] gpiolib: acpi: Make set-debounce-timeout failures non fatal Hans de Goede
2021-08-16 10:25 ` Mika Westerberg
2021-08-16 10:39 ` Hans de Goede [this message]
2021-09-21 18:28 ` Linus Walleij
2021-09-21 18:42 ` Hans de Goede
2021-09-22 9:17 ` Bartosz Golaszewski
2021-09-22 10:55 ` Andy Shevchenko
2021-09-22 12:47 ` Bartosz Golaszewski
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