Message-ID: <5d1cad5b-7d36-71fd-2e23-3bfe05f6e56f@vitsch.nl>
Date:   Tue, 28 Nov 2017 12:20:59 +0100
From:   Thomas van Kleef <thomas@...sch.nl>
To:     Giulio Benetti <giulio.benetti@...ronovasrl.com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     Hans Verkuil <hverkuil@...all.nl>,
        Andreas Baierl <list@...reisrum.de>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        linux@...linux.org.uk, wens@...e.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org
Subject: Re: [linux-sunxi] Cedrus driver

On 28-11-17 10:50, Giulio Benetti wrote:
> Hi Maxime,
> 
> Il 28/11/2017 09:35, Maxime Ripard ha scritto:
>> On Tue, Nov 28, 2017 at 01:03:59AM +0100, Giulio Benetti wrote:
>>> Hi Maxime,
>>>
>>> Il 16/11/2017 14:42, Giulio Benetti ha scritto:
>>>> Hi,
>>>>
>>>> Il 16/11/2017 14:39, Maxime Ripard ha scritto:
>>>>> On Thu, Nov 16, 2017 at 02:17:08PM +0100, Giulio Benetti wrote:
>>>>>> Hi Hans,
>>>>>>
>>>>>> Il 16/11/2017 14:12, Hans Verkuil ha scritto:
>>>>>>> On 16/11/17 13:57, Giulio Benetti wrote:
>>>>>>>> Il 16/11/2017 13:53, Maxime Ripard ha scritto:
>>>>>>>>> On Thu, Nov 16, 2017 at 01:30:52PM +0100, Giulio Benetti wrote:
>>>>>>>>>>> On Thu, Nov 16, 2017 at 11:37:30AM +0100, Giulio Benetti wrote:
>>>>>>>>>>>> Il 16/11/2017 11:31, Andreas Baierl ha scritto:
>>>>>>>>>>>>> Am 16.11.2017 um 11:13 schrieb Giulio Benetti:
>>>>>>>>>>>>>> Hello,
>>>>>>>>>>>>>>
>>>>>>>>>>>>> Hello,
>>>>>>>>>>>>>> I'm wondering why cedrus
>>>>>>>>>>>>>> https://github.com/FlorentRevest/linux-sunxi-cedrus
>>>>>>>>>>>>>> has never been
>>>>>>>>>>>>>> merged with linux-sunxi sunxi-next.
>>>>>>>>>>>>>>
>>>>>>>>>>>>> Because it is not ready to be
>>>>>>>>>>>>> merged. It depends on the v4l2
>>>>>>>>>>>>> request
>>>>>>>>>>>>> API, which was not merged and which is re-worked atm.
>>>>>>>>>>>>> Also, sunxi-cedrus itself is not in
>>>>>>>>>>>>> a finished state and is not as
>>>>>>>>>>>>> feature-complete to be merged. Anyway it might be something for
>>>>>>>>>>>>> staging... Has there been a [RFC] on the mailing list at all?
>>>>>>>>>>>>
>>>>>>>>>>>> Where can I find a list of TODOs to get it ready to be merged?
>>>>>>>>>>>
>>>>>>>>>>> Assuming that the request API is in, we'd need to:
>>>>>>>>>>>        - Finish the MPEG4 support
>>>>>>>>>>>        - Work on more useful codecs (H264 comes to my mind)
>>>>>>>>>>>        - Implement the DRM planes support for
>>>>>>>>>>> the custom frame format
>>>>>>>>>>>        - Implement the DRM planes support for scaling
>>>>>>>>>>>        - Test it on more SoCs
>>>>>>>>>>>
>>>>>>>>>>> Or something along those lines.
>>>>>>>>>>
>>>>>>>>>> Lot of work to do
>>>>>>>>>
>>>>>>>>> Well... If it was fast and easy it would have been done already :)
>>>>>>>>
>>>>>>>> :))
>>>>>>>>
>>>>>>>>>
>>>>>>>>>>>>>> I see it seems to be dead, no commit in 1 year.
>>>>>>>>>>>>>
>>>>>>>>>>>>> Yes, because the author did this
>>>>>>>>>>>>> during an internship, which ended
>>>>>>>>>>>>> ...
>>>>>>>>>>>>> Afaik nobody picked up his work yet.
>>>>>>>>>>>
>>>>>>>>>>> That's not entirely true. Some work has been
>>>>>>>>>>> done by Thomas (in CC),
>>>>>>>>>>> especially on the display engine side, but last time we talked his
>>>>>>>>>>> work was not really upstreamable.
>>>>>>>>>>>
>>>>>>>>>>> We will also resume that effort starting next march.
>>>>>>>>>>
>>>>>>>>>> Is it possible a preview on a separate
>>>>>>>>>> Reporitory to start working on now?
>>>>>>>>>> Expecially to start porting everything done by
>>>>>>>>>> FlorentRevest to mainline,
>>>>>>>>>> admitted you've not already done.
>>>>>>>>>
>>>>>>>>> I'm not sure what you're asking for. Florent's work
>>>>>>>>> *was* on mainline.
>>>>>>>>
>>>>>>>> and then they took it off because it was unmantained?
>>>>>>>> You've spoken about Thomas(in CC) not ready,
>>>>>>>> maybe I could help on that if it's public to accelerate.
>>>>>>>> If I'm able to of course, this is my primary concern.
>>>>>>>>
>>>>>>>> Otherwise, in which way can I help improving it to make
>>>>>>>> it accept to linux-sunxi?
>>>>>>>> Starting from Florent's work and porting it to sunxi-next to begin?
>>>>>>>> And after that adding all features you've listed?
>>>>>>>> Tell me what I can do(I repeat, if I'm able to).
>>>>>>>
>>>>>>> The bottleneck is that the Request API is not mainlined. We
>>>>>>> restarted work
>>>>>>> on it after a meeting a few weeks back where we all agreed
>>>>>>> on the roadmap
>>>>>>> so hopefully it will go into mainline Q1 or Q2 next year.
>>>>>>>
>>>>>>> That said, you can use Florent's patch series for further development.
>>>>>>> It should be relatively easy to convert it to the final version of the
>>>>>>> Request API. Just note that the public API of the final
>>>>>>> Request API will
>>>>>>> be somewhat different from the old version Florent's patch
>>>>>>> series is using.
>>>>>>
>>>>>> So I'm going to try soon to :
>>>>>> 1) adapt that patchset to sunxi-next
>>>>>> 2) add A20 support
>>>>>> 3) add A33 support
>>>>>> 4) after mainlined APIs, merge
>>>>>
>>>>> That sounds good. Thomas already has the support for the A20, and as I
>>>>> was saying, there is someone that is going to work full time on this
>>>>> in a couple monthes on our side.
>>>>>
>>>>> I'll set up a git repo on github so that we can collaborate until the
>>>>> request API is ready.
>>>
>>> Any news about git repo?
>>> When do you plan to do it more or less?
>>
>> I started to do it yesterday.
>>
>> https://github.com/free-electrons/linux-cedrus
>> https://github.com/free-electrons/libva-cedrus
> 
> Great, I'm cloning.
> 1st: have it working with A20 with kernel as is and libva as buildroot package
> 2nd: porting to sunxi-next branch of linux-sunxi and check libva if can work as is
> 
> Thank you
> So, I have been rebasing to 4.14.0 and have the cedrus driver working.
I have pulled linux-mainline 4.14.0. Then pulled the requests2 branch from Hans
Verkuil's media_tree. I have a patch available of the merge between these 2
branches.
After this I pulled the sunxi-cedrus repository from Florent Revests github. I
believe this one is the same as the ones you are cloning right now.
I have merged this and have a patch available for this as well.

So to summarize:
 o pulled linux 4.14 from:
    https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
 o pulled requests2 from:
    https://git.linuxtv.org/hverkuil/media_tree.git?h=requests2
    will be replaced with the work, when it is done, in:
     https://git.linuxtv.org/hverkuil/media_tree.git?h=ctrl-req-v2
 o pulled linux-sunxi-cedrus from:
    https://github.com/FlorentRevest/linux-sunxi-cedrus

 o merged and made patch between linux4.14 and requests2
 o merged and made patch with linux-sunxi-cedrus
 o Verified that the video-engine is decofing mpeg-2 on the Allwinner A20.

So maybe if someone is interested in this, I could place the patches somewhere?
Just let me know.

It would be nice to be able to play a file, so I would have to prepare our
custom player and make a patch between the current sunxi-cedrus-drv-video and
the one on https://github.com/FlorentRevest/sunxi-cedrus-drv-video.
So I will start with this if there is any interest.

Should I be working in sunxi-next I wonder?
>>
>> Maxime
>>
> 
> 

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