linux-kernel - Re: [linux-sunxi] Cedrus driver

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Date:   Thu, 16 Nov 2017 14:17:08 +0100
From:   Giulio Benetti <giulio.benetti@...ronovasrl.com>
To:     Hans Verkuil <hverkuil@...all.nl>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     Andreas Baierl <list@...reisrum.de>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        linux@...linux.org.uk, wens@...e.org, linux-kernel@...r.kernel.org,
        thomas@...sch.nl, linux-media@...r.kernel.org
Subject: Re: [linux-sunxi] Cedrus driver

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

Alright?

Regards

> 
> Regards,
> 
> 	Hans
> 
>>
>>>
>>> Maxime
>>>
>>
>> Thank you
>>
> 


-- 
Giulio Benetti
R&D Manager &
Advanced Research

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