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

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Date:   Tue, 28 Nov 2017 01:03:59 +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 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?

> 
> Great!
> Write me when you've got news.
> 
> Thank you very much!
> 
>>
>> Maxime
>>
> 
> 


-- 
Giulio Benetti
R&D Manager &
Advanced Research

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