Date:   Fri, 29 Apr 2022 10:45:33 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Eugen.Hristev@...rochip.com, linux-media@...r.kernel.org,
        jacopo@...ndi.org
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, Claudiu.Beznea@...rochip.com,
        robh+dt@...nel.org, Nicolas.Ferre@...rochip.com
Subject: Re: [PATCH v9 00/13] media: atmel: atmel-isc: implement media
 controller

On 29/04/2022 10:39, Eugen.Hristev@...rochip.com wrote:
> On 4/29/22 11:33 AM, Hans Verkuil wrote:
>> On 29/04/2022 10:20, Eugen.Hristev@...rochip.com wrote:
>>> On 4/29/22 11:05 AM, Hans Verkuil wrote:
>>>> Hi Eugen,
>>>>
>>>> On 10/03/2022 10:51, Eugen Hristev wrote:
>>>>> This series is the v9 series that attempts to support media controller in the
>>>>> atmel ISC and XISC drivers.
>>>>> The CSI2DC driver was accepted thus removed from the patch series, together with
>>>>> other patches.
>>>>>
>>>>> Important note: this series applies on top of current media_staging tree, as it
>>>>> relies on previous patches in the series which were accepted.
>>>>>
>>>>> Thanks to everyone who reviewed my work !
>>>>>
>>>>> Eugen
>>>>>
>>>>> 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 (13):
>>>>>     media: atmel: atmel-isc-base: use streaming status when queueing
>>>>>       buffers
>>>>>     media: atmel: atmel-isc-base: replace is_streaming call in
>>>>>       s_fmt_vid_cap
>>>>>     media: atmel: atmel-isc: remove redundant comments
>>>>>     media: atmel: atmel-isc: implement media controller
>>>>>     media: atmel: atmel-sama5d2-isc: fix wrong mask in YUYV format check
>>>>>     media: atmel: atmel-isc-base: use mutex to lock awb workqueue from
>>>>>       streaming
>>>>>     media: atmel: atmel-isc: compact the controller formats list
>>>>>     media: atmel: atmel-isc: change format propagation to subdev into only
>>>>>       verification
>>>>>     media: atmel: atmel-sama7g5-isc: remove stray line
>>>>>     dt-bindings: media: microchip,xisc: add bus-width of 14
>>>>
>>>> I'm a bit unhappy with the order of these patches. Mostly these are fixes,
>>>> except for patches 4 and 8, which are the meat of this series and actually
>>>> switching on the MC support.
>>>>
>>>> Can those be moved to the end? That also makes it easier to merge the earlier
>>>> patches if some more work is needed for the MC part.
>>>>
>>>> I'm also not sure whether patches 4 and 8 shouldn't be a single patch,
>>>> since patch 4 leaves the driver in an inconsistent state since it is
>>>> missing the link validation code that patch 8 adds. Unless I missed
>>>> something?
>>>
>>> Hello Hans,
>>>
>>> The difference that patch 8 is making is that the 'old way' of
>>> configuring the ISC is no longer possible.
>>>
>>> Patch 4 makes the ISC 'mc-ready' with all entities, links, but the old
>>> way still works (meaning that the top driver will call s_fmt down to the
>>> subdev ).
>>> After patch 8, the driver no longer has this support at all, and
>>> validates links at start_streaming, and no longer sets anything to the
>>> subdev, just validates the config that the subdev already has.
>>> So one reason that I had things in two patches was that patch 8 makes
>>> this big change that also makes userspace behave differently and has to
>>> configure all the subdevs and media pipeline.
>>>
>>> If you feel patch 4 and patch 8 should be squashed, I can do it, definitely.
>>>
>>> Let me know how to proceed ?
>>
>> Ah, that was your intention. The problem in patch 4 is that you set
>> V4L2_CAP_IO_MC, which indicates to applications that they have to use
>> the MC and configure the pipeline correctly. Moving that to patch 8
>> should resolve that, I think.
> 
> Okay , got it.
> 
> Do you wish to apply some of the patches ? like maybe 1,2,3, 5, 7, 9, 10 
> ? I can then make the series smaller for the next iteration. Otherwise I 
> will resend everything, no problem.

Hmm, since patch 6 needs to be fixed anyway, I prefer a new series that includes
just the fixes. And later a v10 with just the MC patches.

Regards,

	Hans

> 
> Eugen
> 
>>
>> Regards,
>>
>>          Hans
>>
>>>
>>> Thanks,
>>> Eugen
>>>
>>>>
>>>> Regards,
>>>>
>>>>           Hans
>>>>
>>>>>     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
>>>>>
>>>>>    .../bindings/media/microchip,xisc.yaml        |   2 +-
>>>>>    arch/arm/boot/dts/sama7g5.dtsi                |  49 ++
>>>>>    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 | 518 ++++++++++--------
>>>>>    .../media/platform/atmel/atmel-isc-scaler.c   | 267 +++++++++
>>>>>    drivers/media/platform/atmel/atmel-isc.h      |  58 +-
>>>>>    .../media/platform/atmel/atmel-sama5d2-isc.c  |  87 +--
>>>>>    .../media/platform/atmel/atmel-sama7g5-isc.c  |  93 ++--
>>>>>    10 files changed, 754 insertions(+), 327 deletions(-)
>>>>>    create mode 100644 drivers/media/platform/atmel/atmel-isc-scaler.c
>>>>>
>>>>
>>>
>>
> 

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