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

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Message-ID: <56FA6ACC.5080202@rock-chips.com>
Date:	Tue, 29 Mar 2016 19:45:16 +0800
From:	Yakir Yang <ykk@...k-chips.com>
To:	Andreas Färber <afaerber@...e.de>
Cc:	Heiko Stübner <heiko@...ech.de>,
	devicetree@...r.kernel.org, Russell King <linux@....linux.org.uk>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	linux-rockchip@...ts.infradead.org,
	Rob Herring <robh+dt@...nel.org>,
	Kumar Gala <galak@...eaurora.org>,
	linux-arm-kernel@...ts.infradead.org,
	Mark Yao <mark.yao@...k-chips.com>
Subject: Re: [RFC PATCH v1 0/4] Add Rockchip RGA support

Hi Andreas,

On 03/22/2016 06:24 PM, Andreas Färber wrote:
> Hi Yakir,
>
> Am 21.03.2016 um 13:17 schrieb Yakir Yang:
>> On 03/21/2016 07:29 PM, Heiko Stübner wrote:
>>> Am Montag, 21. März 2016, 17:28:38 schrieb Yakir Yang:
>>>> This patch set would add the RGA direct rendering based 2d graphics
>>>> acceleration module.
>>> very cool to see that.
>> ;)
>>>> This patch set is based on git repository below:
>>>> git://people.freedesktop.org/~airlied/linux drm-next
>>>> commit id: 568d7c764ae01f3706085ac8f0d8a8ac7e826bd7
>>>>
>>>> And the RGA driver is based on Exynos G2D driver, it only manages the
>>>> command lists received from user, so user should make the command list
>>>> to data and registers needed by operation to use.
>>>>
>>>> I have prepared an userspace demo application for testing:
>>>>      https://github.com/yakir-Yang/libdrm-rockchip
>>>> That is a rockchip libdrm library, and I have write a simple test case
>>>> "rockchip_rga_test" that would test the below RGA features:
>>>> - solid
>>>> - copy
>>>> - rotation
>>>> - flip
>>>> - window clip
>>>> - dithering
>>> Did you submit your libdrm changes as well?
>>>
>>> Userspace-interfaces need to be stable so the other side must also get
>>> accepted - even before the kernel change if I remember correctly.
>> Got it, and I just saw exynos_fimg2d already landed at mainline libdrm.
>> But I don't find the way to submit patches to libdrm, would you like
>> share some helps here ;)
> If you're using Exynos as an example, please keep in mind that the
> libdrm license is MIT/X11, not GPL as the kernel. For our Linux distro
> we had to disable some Exynos parts because they snuck some GPL code in
> there and redistributing libdrm under GPL would cause a big headache
> (review of all packages directly or indirectly linking against it).

Hmmm... I just saw exynos_drm.h still declared the GNU license,
is it convince for you to share some specific example here ;)

Thanks,
- Yakir
> Thanks,
> Andreas
>