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

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Date:   Thu, 23 Apr 2020 15:59:21 -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 v9 6/9] media: tegra: Add Tegra210 Video input driver


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