linux-kernel - Re: [PATCH v2 4/4] media: platform: mediatek: isp

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Message-ID: <iq7jffjeaejdfb26a4ysjgjzuopov4ji2ecgzmv4563tdveaep@hh2gzgzkbdzj>
Date:   Thu, 3 Aug 2023 11:53:35 +0200
From:   Julien Stephan <jstephan@...libre.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     Phi-bang Nguyen <pnguyen@...libre.com>,
        Florian Sylvestre <fsylvestre@...libre.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Andy Hsieh <andy.hsieh@...iatek.com>,
        Conor Dooley <conor+dt@...nel.org>,
        daoyuan huang <daoyuan.huang@...iatek.com>,
        devicetree@...r.kernel.org,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, linux-media@...r.kernel.org,
        Louis Kuo <louis.kuo@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Moudy Ho <moudy.ho@...iatek.com>,
        Ping-Hsun Wu <ping-hsun.wu@...iatek.com>,
        Rob Herring <robh+dt@...nel.org>,
        Vasily Gorbik <gor@...ux.ibm.com>
Subject: Re: [PATCH v2 4/4] media: platform: mediatek: isp_30: add mediatek
 ISP3.0 camsv

On Mon, Jul 03, 2023 at 02:21:17PM +0200, AngeloGioacchino Del Regno wrote:
..snip..
> > +
> > +	mtk_cam_init_cfg(&cam->subdev, NULL);
>
> mtk_cam_init_cfg() returns an integer, and this is probably because you expect
> it to get logic to fail: in that case, check the result of that call here,
> otherwise, make that function void.
>

Hi Angelo,

mtk_cam_init_cfg returns an int because it should match v4l2_subdev_pad_ops->init_cfg prototype..

mtk_cam_init does not fail, always return 0, so I though it would be ok
to discard the return value here. What do you think?

> > +

..snip..

> > +	unsigned int bpp;
>
> Can we get any format that uses a billion bits per pixel? :-P
>
> u8 bpp;
>

I am preparing the driver for futur upgrades.. in a billion years ;)

Cheers
Julien