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

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Message-ID: <c233b38e-ec06-741f-d0e6-43067ab7f27a@redhat.com>
Date:   Mon, 1 Nov 2021 20:52:31 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Andy Shevchenko <andy.shevchenko@...il.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

Hi,

On 11/1/21 20:27, Andy Shevchenko wrote:
> 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.

I don't remember seeing that, it is great to at least have
a starting point when I get around to looking into this, thank you!

Regards,

Hans