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From:   Andy Shevchenko <andy.shevchenko@gmail.com>
Date:   Mon, 8 Mar 2021 18:46:09 +0200
Message-ID: <CAHp75Veg5LjQdx5VQBUWWkKRSGGQsxW-2sm7Y5aH8-g9cHDfJA@mail.gmail.com>
Subject: Re: [PATCH] Revert "pinctrl: intel: Split intel_pinctrl_add_padgroups()
 for better maintenance"
To:     Maximilian Luz <luzmaximilian@gmail.com>
Cc:     Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Mika Westerberg <mika.westerberg@linux.intel.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        Daniel Scally <djrscally@gmail.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Mon, Mar 8, 2021 at 6:44 PM Maximilian Luz <luzmaximilian@gmail.com> wrote:
> On 3/8/21 5:31 PM, Andy Shevchenko wrote:
> > On Mon, Mar 08, 2021 at 05:35:59PM +0200, Andy Shevchenko wrote:
> >> On Mon, Mar 08, 2021 at 04:25:05PM +0100, Maximilian Luz wrote:
> >>> Following commit 036e126c72eb ("pinctrl: intel: Split
> >>> intel_pinctrl_add_padgroups() for better maintenance"),
> >>> gpiochip_get_desc() is broken on some Kaby Lake R devices (specifically
> >>> a Microsoft Surface Book 2), returning -EINVAL for GPIOs that in reality
> >>> should be there (they are defined in ACPI and have been accessible
> >>> previously). Due to this, gpiod_get() fails with -ENOENT.
> >>>
> >>> Reverting this commit fixes that issue and the GPIOs in question are
> >>> accessible again.
> >>
> >> I would like to have more information.
> >> Can you enable PINCTRL and GPIO debug options in the kernel, and show dmesg
> >> output (when kernel command line has 'ignore_loglevel' option) for both working
> >> and non-working cases?
> >>
> >> Also if it's possible to have DSDT.dsl of the device in question along with
> >> output of `grep -H 15 /sys/bus/acpi/devices/*/status`.
> >>
> >>> There is probably a better option than straight up reverting this, so
> >>> consider this more of a bug-report.
> >>
> >> Indeed.
> >
> >
> > Can you test if the below helps (probably you have to apply it by editing
> > the file manually):
> >
> > --- a/drivers/pinctrl/intel/pinctrl-intel.c
> > +++ b/drivers/pinctrl/intel/pinctrl-intel.c
> > @@ -1392,6 +1392,7 @@ static int intel_pinctrl_add_padgroups_by_size(struct intel_pinctrl *pctrl,
> >       gpps[i].size = min(gpp_size, npins);
> >       npins -= gpps[i].size;
> >
> > +     gpps[i].gpio_base = gpps[i].base;
> >       gpps[i].padown_num = padown_num;
> >
> >
>
> That does fix the issue! Thanks for the fast response and fix!

I'm about to send the formal patch. I will add the
Reported-and-tested-by tag if you are okay with it.

-- 
With Best Regards,
Andy Shevchenko