linux-kernel - Re: [RFC PATCH v10 6/9] media: tegra: Add Tegra210 Video input driver

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Message-ID: <fddb9a1e-c8be-1339-5a06-f3f41541896a@nvidia.com>
Date:   Sat, 25 Apr 2020 20:03:43 -0700
From:   Sowjanya Komatineni <skomatineni@...dia.com>
To:     Dmitry Osipenko <digetx@...il.com>,
        Hans Verkuil <hverkuil@...all.nl>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <frankc@...dia.com>, <sakari.ailus@....fi>,
        <helen.koike@...labora.com>
CC:     <sboyd@...nel.org>, <linux-media@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v10 6/9] media: tegra: Add Tegra210 Video input driver


On 4/25/20 7:48 PM, Sowjanya Komatineni wrote:
>
> On 4/25/20 7:38 PM, Dmitry Osipenko wrote:
>> External email: Use caution opening links or attachments
>>
>>
>> 26.04.2020 05:19, Sowjanya Komatineni пишет:
>>> On 4/25/20 7:10 PM, Dmitry Osipenko wrote:
>>>> External email: Use caution opening links or attachments
>>>>
>>>>
>>>> 26.04.2020 04:43, Sowjanya Komatineni пишет:
>>>> ...
>>>>>> It looks to me that at least all those hardcoded HW format IDs do 
>>>>>> not
>>>>>> match the older SoCs.
>>>>> TPG hard coded formats are supported on prior Tegra.
>>>>>
>>>>> Other supported formats are SoC dependent and  part of soc data in 
>>>>> the
>>>>> driver already.
>>>> But I don't see where that SoC-dependent definition is made in
>>>> terga210.c. That tegra_image_format enum looks T210-specific, isn't 
>>>> it?
>>>>
>>>> ...
>>> Video formats which are SoC variants are made soc specific in driver
>>> already tegra_vi_soc structure member video_formats
>>>
>>> tegra_image_format enum is same for T210 and T186
>>>
>>> For T194, enums will be diff and will have diff TEGRA194_VIDEO_FORMAT
>>> using corresponding Tegra194 video format enums
>> But it is also not the same for older SoCs, correct? All the
>> T210-specific things should be separated better, unique parts shouldn't
>> be kept in the common code.
>>
>> Hence the tegra_image_format should be renamed to tegra210_image_format
>> and moved out to t210.h, since it's not common. But then you'll probably
>> need to rename all TEGRA_ defines to TEGRA210_ to make t210.h reusable
>> by T186.
>
> We can't make t210.h reusable for t186 as all register defines are diff.
>
> only video format enums are same b/w them so to reuse that for t186 I 
> had that in common.
>
> Regarding defines, will change prefix as Tegra210
>
>>
>> Also, in the end it may not worth the effort to share anything at all,
>> it could be cleaner to have a bit of duplication. Although, I have no
>> idea how T186 code will look like and what other parts of T210 could be
>> reused by T186. All this needs to be taken into account in order to
>> avoid struggling with the code's reshuffling in the future.
>
> Currently as image formats are same for t210 and t186 I had them in 
> common.h and for t194 where they are diff new enums will be added.
>
> Other tegra210 soc specific only are all part of tegra210.c/h
>
Will move video formats to tegra specific file (tegra210.c)...