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

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Message-ID: <20171116133906.xsrpkdflgf34kkoy@flea>
Date:   Thu, 16 Nov 2017 14:39:06 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Giulio Benetti <giulio.benetti@...ronovasrl.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

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.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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