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

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Date:   Fri, 4 Aug 2023 09:34:45 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Julien Stephan <jstephan@...libre.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

Il 03/08/23 11:53, Julien Stephan ha scritto:
> 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?
> 

Right, I was thinking to make a void __mtk_cam_init_cfg(), but as an afterthought
it's just better to leave it as it is, let's go with your solution.

Cheers,
Angelo

>>> +
> 
> ..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