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From:   Raul Rangel <rrangel@chromium.org>
Date:   Mon, 13 Feb 2023 10:20:41 -0700
Message-ID: <CAHQZ30Cs+kp82coR10Wat7q3S_8+pFf=5=44kMEMcjBOjmn=6A@mail.gmail.com>
Subject: Re: [PATCH] gpiolib: acpi: Add a ignore wakeup quirk for Clevo NH5xAx
To:     Werner Sembach <wse@tuxedocomputers.com>
Cc:     Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Mario Limonciello <mario.limonciello@amd.com>,
        mika.westerberg@linux.intel.com, linus.walleij@linaro.org,
        brgl@bgdev.pl, linux-gpio@vger.kernel.org,
        linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org,
        Alex Deucher <alexander.deucher@amd.com>
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Precedence: bulk

SUSB#_EN

On Mon, Feb 13, 2023 at 7:47 AM Werner Sembach <wse@tuxedocomputers.com> wrote:
>
> Am 13.02.23 um 15:37 schrieb Andy Shevchenko:
> > On Mon, Feb 13, 2023 at 07:20:48AM -0600, Mario Limonciello wrote:
> >> On 2/13/23 06:41, Andy Shevchenko wrote:
> >>> On Mon, Feb 13, 2023 at 12:30:08PM +0100, Werner Sembach wrote:
> >>>> 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.
> >>> Yeah, and I reviewed that and seems paid no attention to this detail.
> >>>
> >>> So, ActiveLow + PullUp is the _right_ thing to do in ACPI.
> >>> The problem seems somewhere else.
> >>>
> >>> Mario, can we have an access to the schematics of the affected pin to
> >>> understand better what's going on?
> >>>
> >>> Or is that description missing some crucial detail?
>
> Schematics for the NH5xAx can also be found on this unofficial clevo mirror
> (service manuals, scroll to end for schematics):
>
> http://repo.palkeo.com/clevo-mirror/NH5xACx_AFx_ADx/NH50AC.zip
>
> http://repo.palkeo.com/clevo-mirror/NH5xACx_AFx_ADx/NH50AF1.zip
>
> User: repo
>
> PW: repo
>
> >> The schematics were shared by the reporter for the original issue which is
> >> how we reached the conclusion there was a mistake.
> >>
> >> As they're both Clevo designs it's certainly possible they have the same
> >> mistake in two systems.

> > Thank you!
> > I have looked at the schematics and read discussion.
> >
> > So, the conclusion that this is a BIOS bug is incorrect in my opinion.
> > The problem is either in the PMIC/EC firmware that shouldn't shut down 3.3VS
> > signal for a while or on the PCB level, so that pull up should be connected
> > to another power source that stays on.
> >
> > This means the description on the initial patch with the same issue is
> > incorrect.
> >
> > Do we know the power sequence on the suspend to see which and how on the
> > time line the power sources are off/on?
> >

If you look at the load switch for 3.3VS, its EN2 pin is connected to
SUSB#_EN which is connected to SUSB# which is connected to
AND(SUSB#_PCH -> SLP_S3_L, PM_SLP_S0 -> S0A3_GPIO). So there is no
PMIC/EC firmware that is incharge of this. I guess I'm not quite sure
how they have S0A3_GPIO configured, so maybe I have an invert wrong.

The EC does control DD_ON which controls the 3.3V and 5V rails.

> >>>>>> 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 ^^
> >>> The GpioIo() and GpioInt() resources have gaps in them, due to this some
> >>> additional information is required or some heuristics is used to deduct
> >>> the settings.
> >>>
> >>> All this is described in
> >>> https://www.kernel.org/doc/html/latest/firmware-guide/acpi/gpio-properties.html
> >>>
> >>>> I added the other ones from there to the cc.
> >>> Thank you.