drm/exynos: add render node support

[Tobias Jakobi]

Emil Velikov wrote:
> On 31 August 2015 at 13:36, Inki Dae <inki.dae at samsung.com> wrote:
>> Hi Emil,
>>
>> On 2015년 08월 31일 20:58, Emil Velikov wrote:
>>> Hi all,
>>>
>>> On 18 August 2015 at 08:01, Inki Dae <inki.dae at samsung.com> wrote:
>>>> From: Joonyoung Shim <jy0922.shim at samsung.com>
>>>>
>>>> This patch allows clients who want to use render node to access
>>>> rendering relevant ioctls - g2d, post processor and gem allocation.
>>>>
>>> I seem to recall Dave and others saying that we must have users of
>>> these interfaces prior to merging them into the kernel. Then again I
>>> cannot find any open-source userspace using the post-processor. Can
>>> anyone kingly share a link ?
>>
>> You can refer to the user-space below,
>> https://review.tizen.org/git/?p=platform/upstream/libdrm.git;a=commit;h=52de1c57e2e6f3b2a1259478d5ae260ed4c5706e
>>
> Nice one thanks !
> Did those patch(es) ever made it to the list ? Mind giving them a tiny
> bit of cleanup (move tests to exynos, drop duplication, C99
> initializers) and sending them over ?
> 
> On a mildly related note:
> The tizen people like excessive rebasing :( Another alternative would
> be to send fixes upstream and keep their changes within ./packaging,
> which will allow clean merges.
> 
>>>
>>> On the g2d front, can you guys take a look at the work Tobias has been
>>> doing ? He seems to be the only one that cares about it :'(
>>
>> I'd like to say really sorry about that to you and Tobias. Will review
>> it soon.
>>
> Great. Tobias sent a few more drm/exynos and libdrm (g2d utilities)
> patches that've been around for a while :(
Thanks, the size two patches for the kernel (size check) are kinda
important. Currently userspace can easily trigger a pagefault due to
this being wrong. So maybe it's also a candidate for stable (but I don't
know too much about how stable backports work).

With best wishes,
Tobias

P.S.: I also might've some patches ready in 2 weeks or so which should
resolve the g2d/userptr issues.


> 
> Perhaps he can re-spin then and/or send a list with outstanding ones ?
> 
> Cheers,
> Emil
>