linux-kernel - Re: [PATCH] gpiolib: acpi: Add a ignore wakeup quirk for Clevo NH5xAx

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Date:   Mon, 13 Feb 2023 12:30:08 +0100
From:   Werner Sembach <wse@...edocomputers.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     mika.westerberg@...ux.intel.com, linus.walleij@...aro.org,
        brgl@...ev.pl, linux-gpio@...r.kernel.org,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Limonciello, Mario" <mario.limonciello@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Raul E Rangel <rrangel@...omium.org>
Subject: Re: [PATCH] gpiolib: acpi: Add a ignore wakeup quirk for Clevo NH5xAx

Am 10.02.23 um 18:04 schrieb Andy Shevchenko:
> On Fri, Feb 10, 2023 at 05:46:36PM +0100, Werner Sembach wrote:
>> commit 1796f808e4bb ("HID: i2c-hid: acpi: Stop setting wakeup_capable")
>> changed the policy such that I2C touchpads may be able to wake up the
>> system by default if the system is configured as such.
>>
>> However on Clevo NH5xAx/TUXEDO XA15 Gen10 there is a mistake in the ACPI
>> tables that the TP_ATTN# signal connected to GPIO 10 is configured as
>> ActiveLow and level triggered but connected to a pull up.
> I'm not sure I understand the issue here. From what you say here it seems
> correct ACPI description.
TBH I copied the commit description from 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4cb786180dfb5258ff3111181b5e4ecb1d4a297b 
which is for a different device having the exact same problem.
>
>> As soon as the
>> system suspends the touchpad loses power and then the system wakes up.
>>
>> To avoid this problem, introduce a quirk for this model that will prevent
>> the wakeup capability for being set for GPIO 10.
> I'm not against fixing this, but wouldn't be better to actually target the root
> cause and have a different quirk? Or is it me who didn't get what is the root
> cause?
>
I missed to reference the original discussion while copying the description: 
https://gitlab.freedesktop.org/drm/amd/-/issues/1722#note_1720627 (Note that 
it's a somewhat convoluted issue spanning multiple bugs when you scroll up from 
that particular linked comment, which are however irrelevant for this patch)

I'm not deep into how ACPI defined IRQ work so maybe not a good idea for me 
summing it up, as I might have misunderstood parts of it ^^

I added the other ones from there to the cc.