linux-kernel - Re: [PATCH] pinctrl: icelake: Fix the resource number for community-4/5

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Message-ID: <CAHp75VdyOAzHDNr4L6Onj=Qgu2DfQxPy-j_jo2HXfyukCZRePg@mail.gmail.com>
Date:   Tue, 25 Sep 2018 00:09:10 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Rajat Jain <rajatja@...gle.com>
Cc:     subrata.banik@...el.com,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rajat Jain <rajatxjain@...il.com>, aamir.bohra@...el.com
Subject: Re: [PATCH] pinctrl: icelake: Fix the resource number for community-4/5

On Mon, Sep 24, 2018 at 8:04 PM Rajat Jain <rajatja@...gle.com> wrote:
> On Mon, Sep 24, 2018 at 7:54 AM Banik, Subrata <subrata.banik@...el.com> wrote:

> > First of all, this is pre-production chip, so, I don't think there is a bug in the driver (yet) discovered.
> >
> > Looking to the above ASL code I may conclude that is definitely is *not* from our reference BIOS.
> > I have checked two versions of it and found that in both we have the following mapping:
> > for LP variant: there are only 4 communities are exported for H variant: there are only 5 communities are exported
> >
> > So, I guess the problem is in ASL code you provided. It simple should not export that community at all.
> >
> > In case you need to do so, there are ways:
> >  - contact Intel and ask for a change in reference BIOS
> >  - acquire another ACPI ID for the case, or, perhaps use special constants like
> >    _HRV for that purpose (also need to contact Intel while doing that)
>
> As Subrata clarified (Subrata & Aamir are from Intel's Coreboot team),
> that is not *the* Intel reference BIOS that you are using, but it is
> *an* Intel generated BIOS/Coreboot image.

Ah, interesting.

> Andy, can you please let us know in what order are the resources laid
> out in your reference BIOS for the case when it exports 5 communities
> (i.e. community-0-2, 4-5)?

We have no hardware with such PCH to answer to this question. LP
version exports only 4 communities and order of them as per existing
driver.

-- 
With Best Regards,
Andy Shevchenko