linux-kernel - Re: [RESEND PATCH v4 03/21] staging: media: tegra-video: fix .vidioc_enum_fmt_vid

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Message-ID: <20230405023048.GD9915@pendragon.ideasonboard.com>
Date:   Wed, 5 Apr 2023 05:30:48 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Luca Ceresoli <luca.ceresoli@...tlin.com>
Cc:     Hans Verkuil <hverkuil-cisco@...all.nl>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Sowjanya Komatineni <skomatineni@...dia.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dmitry Osipenko <digetx@...il.com>,
        linux-media@...r.kernel.org, linux-tegra@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-staging@...ts.linux.dev,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Richard Leitner <richard.leitner@...data.com>
Subject: Re: [RESEND PATCH v4 03/21] staging: media: tegra-video: fix
 .vidioc_enum_fmt_vid_cap to return all formats

Hi Luca,

On Tue, Apr 04, 2023 at 04:12:51PM +0200, Luca Ceresoli wrote:
> On Wed, 29 Mar 2023 13:16:22 +0200 Hans Verkuil wrote:
> 
> > Hi Luca,
> > 
> > I finally found the time to test this series. It looks OK, except for this patch.
> 
> Thank you very much for taking the time!
> 
> > The list of supported formats really has to be the intersection of what the tegra
> > supports and what the sensor supports.
> > 
> > Otherwise you would advertise pixelformats that cannot be used, and the application
> > would have no way of knowing that.
> 
> As far as I understand, I think we should rather make this driver fully
> behave as an MC-centric device. It is already using MC quite
> successfully after all.
> 
> Do you think this is correct?

Given the use cases for this driver, I agree.

> If you do, then I think the plan would be:
> 
>  - Add the V4L2_CAP_IO_MC flag
>  - As the mbus_code in get_format appropriately
>  - Leave the changes in this patch unmodified otherwise

-- 
Regards,

Laurent Pinchart