linux-kernel - Re: [PATCH 04/17] media: atomisp: pci: do not use err var when checking port validity for ISP2400

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Date:   Mon, 1 Nov 2021 21:27:50 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tsuchiya Yuto <kitakar@...il.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        linux-staging@...ts.linux.dev,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Nable <nable.maininbox@...glemail.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Fabio Aiuto <fabioaiuto83@...il.com>,
        "andrey.i.trufanov" <andrey.i.trufanov@...il.com>,
        Patrik Gfeller <patrik.gfeller@...il.com>
Subject: Re: [PATCH 04/17] media: atomisp: pci: do not use err var when
 checking port validity for ISP2400

On Mon, Nov 1, 2021 at 9:07 PM Hans de Goede <hdegoede@...hat.com> wrote:
> On 11/1/21 15:10, Mauro Carvalho Chehab wrote:

...

> Testing BYT support definitely is on my radar. Note that BYT
> also has the additional issue that the atomisp2 on BYT can be
> enumerated as either a PCI dev (which may work) or an ACPI/platform
> dev which is unsupported in the original atomisp2 code-drop and
> seems non trivial (because of pci config space writes) to get to
> work.
>
> On the T100TA the device is actually enumerated as an ACPI/platform
> device and the BIOS option to change this is hidden. In the mean
> time I've gained quite a lot of experience with changing hidden
> BIOS options though, so I can easily put it in PCI mode for
> testing. But eventually we also need to tackle ACPI enumeration
> support...

Not sure if you saw my very far from being even tested patch...
Share it here just in case. I believe you will have a better idea on
how to implement it.


-- 
With Best Regards,
Andy Shevchenko

View attachment "0001-i915-Enumerate-AtomISP-when-it-s-an-ACPI-device.patch" of type "text/x-patch" (9630 bytes)