Message-ID: <bc22469c-d1ab-72e2-8e9e-6bd42d66f3d9@microchip.com>
Date:   Wed, 22 Jun 2022 12:42:18 +0000
From:   <Eugen.Hristev@...rochip.com>
To:     <hverkuil@...all.nl>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-media@...r.kernel.org>
CC:     <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <Claudiu.Beznea@...rochip.com>, <Nicolas.Ferre@...rochip.com>,
        <jacopo@...ndi.org>
Subject: Re: [PATCH v10 0/5] media: atmel: atmel-isc: implement media
 controller

On 6/22/22 3:25 PM, Eugen Hristev - M18282 wrote:
> On 6/22/22 2:53 PM, Hans Verkuil wrote:
>> Hi Eugen,
>>
>> On 03/05/2022 11:51, Eugen Hristev wrote:
>>> This series is a split from the series :
>>> [PATCH v9 00/13] media: atmel: atmel-isc: implement media controller
>>> and it includes the media controller part.
>>> previous fixes were sent on a different patch series.
>>>
>>> As discussed on the ML, moving forward with having the media link validate at
>>> start/stop streaming call.
>>> I will test the patch :
>>> [RFC PATCHv2] vb2: add support for (un)prepare_streaming queue ops
>>> afterwards, but that patch requires moving my logic to the new vb2 callbacks.
>>
>> I'm looking at merging this series, but I would like to have the output of
>> 'v4l2-compliance -m /dev/mediaX' to verify that the MC links etc. is all
>> correct.
> 
> Hello Hans,
> 
> Please have a look at attached file . Unless you want me to add the
> whole output to the e-mail ?
> 
> I also added output of media-ctl -p for your convenience.
> the subdev2 is a device and driver that is not upstream and has some
> compliance issues, they are reported by the v4l2-compliance tool, but
> they should not affect this series, it's a synopsys driver that was
> rejected on mainline a few years ago, I took it for internal usage, but
> it's not cleaned up nor worked a lot upon.
> 
>>
>> And one more question which may have been answered already in the past:
>>
>> Changing to the MC will break existing applications, doesn't it? Or did I
>> miss something?
>>
> 
> The existing applications will have to configure the pipeline now. It
> will no longer work by configuring just the top video node /dev/video0 .
> They would have to use media-ctl for it, something similar with this set
> of commands:

To add on top of that, actually, the reality is that without the MC 
support in atmel-isc , some of our platforms do not work at all, because 
the csi2dc driver which is in the middle of the pipeline, is a MC 
driver. So it will not work without configuring it with MC anyway. It 
used to work in a very preliminary version of the csi2dc driver which I 
sent a few years ago, but that way of handling things was rejected. 
Hence I changed the csi2dc to being full-MC driver (requested for new 
drivers) and now I am completing the conversion for the whole pipeline.
We are using this MC-centric approach in production for our products to 
be as close as possible to mainline, and backported it to our 5.15 
internal releases, which people are using right now.

> 
> media-ctl -d /dev/media0 --set-v4l2 '"imx219
> 1-0010":0[fmt:SRGGB10_1X10/1920x1080]'
> media-ctl -d /dev/media0 --set-v4l2
> '"dw-csi.0":0[fmt:SRGGB10_1X10/1920x1080]'
> media-ctl -d /dev/media0 --set-v4l2 '"csi2dc":0[fmt:SRGGB10_1X10/1920x1080]'
> media-ctl -d /dev/media0 --set-v4l2
> '"atmel_isc_scaler":0[fmt:SRGGB10_1X10/1920x1080]'
> 
> Thank you for taking care of this !
> 
> Eugen
> 
>> Regards,
>>
>>           Hans
>>
>>>
>>> Full series history:
>>>
>>> Changes in v10:
>>> -> split the series into this first fixes part.
>>> -> moved IO_MC addition from first patch to the second patch on the driver changes
>>> -> edited commit messages
>>> -> DT nodes now disabled by default.
>>>
>>> Changes in v9:
>>> -> kernel robot reported isc_link_validate is not static, changed to static.
>>>
>>> Changes in v8:
>>> -> scaler: modified crop bounds to have the exact source size
>>>
>>> Changes in v7:
>>> -> scaler: modified crop bounds to have maximum isc size
>>> -> format propagation: did small changes as per Jacopo review
>>>
>>>
>>> Changes in v6:
>>> -> worked a bit on scaler, added try crop and other changes as per Jacopo review
>>> -> worked on isc-base enum_fmt , reworked as per Jacopo review
>>>
>>> Changes in v5:
>>> -> removed patch that removed the 'stop' variable as it was still required
>>> -> added two new trivial patches
>>> -> reworked some parts of the scaler and format propagation after discussions with Jacopo
>>>
>>>
>>> Changes in v4:
>>> -> as reviewed by Hans, added new patch to remove the 'stop' variable and reworked
>>> one patch that was using it
>>> -> as reviewed by Jacopo, reworked some parts of the media controller implementation
>>>
>>>
>>> Changes in v3:
>>> - change in bindings, small fixes in csi2dc driver and conversion to mc
>>> for the isc-base.
>>> - removed some MAINTAINERS patches and used patterns in MAINTAINERS
>>>
>>> Changes in v2:
>>> - integrated many changes suggested by Jacopo in the review of the v1 series.
>>> - add a few new patches
>>>
>>> Eugen Hristev (5):
>>>     media: atmel: atmel-isc: prepare for media controller support
>>>     media: atmel: atmel-isc: implement media controller
>>>     ARM: dts: at91: sama7g5: add nodes for video capture
>>>     ARM: configs: at91: sama7: add xisc and csi2dc
>>>     ARM: multi_v7_defconfig: add atmel video pipeline modules
>>>
>>>    arch/arm/boot/dts/sama7g5.dtsi                |  51 ++
>>>    arch/arm/configs/multi_v7_defconfig           |   3 +
>>>    arch/arm/configs/sama7_defconfig              |   2 +
>>>    drivers/media/platform/atmel/Makefile         |   2 +-
>>>    drivers/media/platform/atmel/atmel-isc-base.c | 485 +++++++++---------
>>>    .../media/platform/atmel/atmel-isc-scaler.c   | 267 ++++++++++
>>>    drivers/media/platform/atmel/atmel-isc.h      |  50 +-
>>>    .../media/platform/atmel/atmel-sama5d2-isc.c  |  34 +-
>>>    .../media/platform/atmel/atmel-sama7g5-isc.c  |  32 +-
>>>    9 files changed, 685 insertions(+), 241 deletions(-)
>>>    create mode 100644 drivers/media/platform/atmel/atmel-isc-scaler.c
>>>
>>
> 

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