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

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Message-ID: <b5c23ea7-4efa-1565-0c53-014c8a1ee37d@micronovasrl.com>
Date:   Thu, 16 Nov 2017 14:42:23 +0100
From:   Giulio Benetti <giulio.benetti@...ronovasrl.com>
To:     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,
        thomas@...sch.nl, linux-media@...r.kernel.org
Subject: Re: [linux-sunxi] Cedrus driver

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.

Great!
Write me when you've got news.

Thank you very much!

> 
> Maxime
> 


-- 
Giulio Benetti
R&D Manager &
Advanced Research

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