linux-kernel - Re: [PATCH v10 0/5] media: atmel: atmel-isc: implement media controller

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Message-ID: <a19d9e72-7609-1daa-93eb-fdedcaa672c4@microchip.com>
Date:   Wed, 22 Jun 2022 12:25:11 +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 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:

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
>>
> 


View attachment "v4l2-compl-atmel" of type "text/plain" (20788 bytes)