linux-kernel - Re: [RFC PATCH v1 0/4] Add Rockchip RGA support

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Message-ID: <CACvgo50REvRxN2_qdw=2NeTTSgjpA+9c8OZgPE0q19meH6ArKA@mail.gmail.com>
Date:	Tue, 29 Mar 2016 14:13:26 +0100
From:	Emil Velikov <emil.l.velikov@...il.com>
To:	Heiko Stübner <heiko@...ech.de>
Cc:	Yakir Yang <ykk@...k-chips.com>, David Airlie <airlied@...ux.ie>,
	Mark Yao <mark.yao@...k-chips.com>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Kumar Gala <galak@...eaurora.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Russell King <linux@....linux.org.uk>,
	devicetree <devicetree@...r.kernel.org>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	ML dri-devel <dri-devel@...ts.freedesktop.org>,
	linux-rockchip <linux-rockchip@...ts.infradead.org>,
	LAKML <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH v1 0/4] Add Rockchip RGA support

On 28 March 2016 at 23:13, Heiko Stübner <heiko@...ech.de> wrote:

> I have the feeling we're going quite a bit off-topic right now :-) .
> The binary-driver-crazyness, hasn't really anything to do with Yakir's support
> for the RGA (which is about raster-graphics-acceleration, so 2d stuff).
>
> And me mentioning the armsoc-ddx was merely a means to allow some sort of
> different userspace user, as requested in your original mail ;-) .
>
Seems like I forgot to state the obvious - for all the reasons
mentioned, the armsoc ddx seems like a bad example.

> Maybe you know a better use-case on where to demonstrate the viability of the
> userspace API for it as originally requested.
I'm afraid that my RockChip-foo is extremely limited. Perhaps the
actual user of these should be mentioned ? xf86-video-rockhip (is
there one ?) or any other effort/project that lacks some (all?) of the
criticism listed.

(Sort of) the bottom line - either reuse the existing interfaces or
provide an approved, full blown userspace (libdrm demos/programs do
not count) that uses the new interfaces.

I haven't made these rules, just a fool^Wguy that repeats them so that
people don't abuse them much. If in doubt check with Dave and Daniel V
- they had enough repeating these.

-Emil