Message-ID: <950ce59e-ff3a-0e1c-d8e4-0fe14643f738@microchip.com>
Date:   Fri, 29 Apr 2022 08:39:53 +0000
From:   <Eugen.Hristev@...rochip.com>
To:     <hverkuil@...all.nl>, <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 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.

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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