linux-kernel - Re: [RFC PATCH v9 6/9] media: tegra: Add Tegra210 Video input driver

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Message-ID: <a4f5a84f-b893-cade-adeb-23637ea133c2@gmail.com>
Date:   Fri, 24 Apr 2020 02:14:16 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.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 v9 6/9] media: tegra: Add Tegra210 Video input driver

24.04.2020 02:03, Dmitry Osipenko пишет:
> 24.04.2020 01:59, Sowjanya Komatineni пишет:
>>
>> On 4/23/20 3:55 PM, Dmitry Osipenko wrote:
>>> External email: Use caution opening links or attachments
>>>
>>>
>>> 23.04.2020 19:50, Sowjanya Komatineni пишет:
>>>> On 4/23/20 12:48 AM, Hans Verkuil wrote:
>>>>> External email: Use caution opening links or attachments
>>>>>
>>>>>
>>>>> On 22/04/2020 08:18, Sowjanya Komatineni wrote:
>>>>>> Tegra210 contains a powerful Video Input (VI) hardware controller
>>>>>> which can support up to 6 MIPI CSI camera sensors.
>>>>>>
>>>>>> Each Tegra CSI port can be one-to-one mapped to VI channel and can
>>>>>> capture from an external camera sensor connected to CSI or from
>>>>>> built-in test pattern generator.
>>>>>>
>>>>>> Tegra210 supports built-in test pattern generator from CSI to VI.
>>>>>>
>>>>>> This patch adds a v4l2 capture driver with media interface for
>>>>>> Tegra210 built-in CSI to VI test pattern generator.
>>>>>>
>>>>>> This patch includes TPG support only and all the video pipeline
>>>>>> configuration happens through the video device node.
>>>>>>
>>>>>> Acked-by: Thierry Reding <treding@...dia.com>
>>>>>> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
>>>>>> ---
>>>>>>    drivers/staging/media/Kconfig          |    2 +
>>>>>>    drivers/staging/media/Makefile         |    1 +
>>>>>>    drivers/staging/media/tegra/Kconfig    |   13 +
>>>>>>    drivers/staging/media/tegra/Makefile   |    8 +
>>>>>>    drivers/staging/media/tegra/TODO       |   10 +
>>>>>>    drivers/staging/media/tegra/common.h   |  262 ++++++++
>>>>>>    drivers/staging/media/tegra/csi.c      |  606 +++++++++++++++++
>>>>>>    drivers/staging/media/tegra/csi.h      |  149 +++++
>>>>>>    drivers/staging/media/tegra/tegra210.c |  709 ++++++++++++++++++++
>>>>>>    drivers/staging/media/tegra/tegra210.h |  190 ++++++
>>>>>>    drivers/staging/media/tegra/vi.c       | 1132
>>>>>> ++++++++++++++++++++++++++++++++
>>>>>>    drivers/staging/media/tegra/vi.h       |   83 +++
>>>>>>    drivers/staging/media/tegra/video.c    |  153 +++++
>>>>>>    drivers/staging/media/tegra/video.h    |   34 +
>>>>>>    14 files changed, 3352 insertions(+)
>>>>>>    create mode 100644 drivers/staging/media/tegra/Kconfig
>>>>>>    create mode 100644 drivers/staging/media/tegra/Makefile
>>>>>>    create mode 100644 drivers/staging/media/tegra/TODO
>>>>>>    create mode 100644 drivers/staging/media/tegra/common.h
>>>>>>    create mode 100644 drivers/staging/media/tegra/csi.c
>>>>>>    create mode 100644 drivers/staging/media/tegra/csi.h
>>>>>>    create mode 100644 drivers/staging/media/tegra/tegra210.c
>>>>>>    create mode 100644 drivers/staging/media/tegra/tegra210.h
>>>>>>    create mode 100644 drivers/staging/media/tegra/vi.c
>>>>>>    create mode 100644 drivers/staging/media/tegra/vi.h
>>>>>>    create mode 100644 drivers/staging/media/tegra/video.c
>>>>>>    create mode 100644 drivers/staging/media/tegra/video.h
>>>>> With 'make menuconfig' I get this:
>>>>>
>>>>> scripts/kconfig/mconf  Kconfig
>>>>>
>>>>> WARNING: unmet direct dependencies detected for TEGRA_HOST1X
>>>>>     Depends on [n]: HAS_IOMEM [=y] && (ARCH_TEGRA || ARM &&
>>>>> COMPILE_TEST [=y])
>>>>>     Selected by [y]:
>>>>>     - VIDEO_TEGRA [=y] && STAGING [=y] && STAGING_MEDIA [=y] &&
>>>>> MEDIA_SUPPORT [=y] && (ARCH_TEGRA || COMPILE_TEST [=y])
>>>>>
>>>>> This is an x86_64 build with COMPILE_TEST set. I can provide my full
>>>>> .config if you need it.
>>>>>
>>>>> CONFIG_TEGRA_HOST1X=y
>>>>> CONFIG_VIDEO_TEGRA=y
>>>>>
>>>>> Regards,
>>>>>
>>>>>           Hans
>>>> Hi Hans,
>>>>
>>>> In v7, changed Kconfig to remove ARM. But looks like we should limit
>>>>
>>>> TEGRA_HOST1X also limits compile to ARM only so running VIDEO_TEGRA on
>>>> x86_64 shows above warning.
>>>>
>>>> We should limit compile to ARM for CONFIG_VIDEO_TEGRA.
>>>>
>>>> Will update CONFIG_VIDEO_TEGRA dependency to use ARM && COMPILE_TEST
>>>> like I had in previous version. Sorry about this.
>>>>
>>>>
>>>> Also, I see some changes went into latest linux-next staging media
>>>> Kconfig, So, will have my patches on top of today's linux-next.
>>> VIDEO_TEGRA should depend on TEGRA_HOST1X and not select it.
>>>
>>> depends on (ARCH_TEGRA && TEGRA_HOST1X) || COMPILE_TEST
>>
>> Was selecting it to auto-select Tegra host1x when video_tegra is enabled.
>>
>> Yes, can use depends on
>>
> 
> BTW, perhaps ARCH_TEGRA and COMPILE_TEST aren't needed since
> TEGRA_HOST1X already depends on them, so just:
> 
> depends on TEGRA_HOST1X
> 

Although, I guess TEGRA_HOST1X isn't really needed for compile-testing,
and thus, it won't hurt to drop that dependency for testing:

depends on TEGRA_HOST1X || COMPILE_TEST