linux-kernel - Re: [PATCH] pinctrl: cherryview: Add quirk with custom translation of ACPI GPIO numbers

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Message-ID: <CAMiGqYi2rVAc=hepkY-4S1U_3dJdbR4pOoB0f8tbBL4pzWLdxA@mail.gmail.com>
Date:   Thu, 6 Feb 2020 23:26:54 +0100
From:   Michał Stanek <mst@...ihalf.com>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:     linux-gpio@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, stanekm@...gle.com,
        stable@...r.kernel.org, Marcin Wojtas <mw@...ihalf.com>,
        levinale@...omium.org, andriy.shevchenko@...ux.intel.com,
        Linus Walleij <linus.walleij@...aro.org>,
        bgolaszewski@...libre.com, rafael.j.wysocki@...el.com,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: Re: [PATCH] pinctrl: cherryview: Add quirk with custom translation of
 ACPI GPIO numbers

On Thu, Feb 6, 2020 at 9:31 AM Mika Westerberg
<mika.westerberg@...ux.intel.com> wrote:
>
> On Wed, Feb 05, 2020 at 08:48:04PM +0100, Michal Stanek wrote:
> > Dropping custom Linux GPIO translation caused some Intel_Strago based Chromebooks
> > with old firmware to detect GPIOs incorrectly. Add quirk which restores some code removed by
> > commit 03c4749dd6c7ff94 ("gpio / ACPI: Drop unnecessary ACPI GPIO to Linux GPIO translation").
>
> Hi,
>
> Can you elaborate this? I was under the impression that all the
> different Strago systems have been already worked around by patches from
> Dmitry (Cc'd).

Hi Mika,

The previous patches from Dmitry handled IRQ numbering, here we have a
similar issue with GPIO to pin translation - hardcoded values in FW
which do not agree with the (non-consecutive) numbering in newer
kernels.

> What GPIO(s) we are talking about and how does it show up to the user?

As an example, the issue manifests itself when you run 'crossystem
wpsw_cur'. On my Kefka it incorrectly reports the value as 1 instead
of 0 when the write protect screw is removed.


> > +             /*
> > +              * Some Braswell based Google Chromebooks need custom ACPI GPIO
> > +              * number translation due to hardcoded GPIO numbers in firmware.
> > +              */
> > +             .ident = "Intel_Strago based Chromebooks (All models)",
> > +             .matches = {
> > +                     DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
> > +                     DMI_MATCH(DMI_PRODUCT_FAMILY, "Intel_Strago"),
>
> Same comment here. Are you saying all Stragos are broken in the current
> mainline?

Yes, I believe all Braswell based Chromebooks are affected.
Yes, I believe all Braswell based Chromebooks are affected.