[Freedreno] [GSoC-15] Enabling Freedreno on Android

[Ilia Mirkin]

I'm fairly ignorant about android stuff, but I think that while a lot
of pieces exist, no one has taken the effort to put it all together.
IMHO the most ideal outcome of a GSoC project would be e.g. a
CyanogenMod build (or pick-your-favorite-android-distro) for some
concrete Adreno device that runs freedreno on top of drm/msm (or
drm/kgsl, although that's a less ideal outcome). Using that as a guide
should make it a lot more feasible to support more devices. The DSI
work will likely be a huge component of making that happen, so it's
great that it's happening in parallel (and should be ready by summer
time if current progress is any indication).

Just my proverbial 2 cents :)

  -ilia


On Mon, Mar 16, 2015 at 12:11 PM, Rob Clark <robdclark at gmail.com> wrote:
> On Mon, Mar 16, 2015 at 11:27 AM, Varad Gautam <varadgautam at gmail.com> wrote:
>> Hi Rob,
>>
>> I'm gradually coming up to speed with the current state of things, and
>> have some more questions about adding Freedreno support to Android.
>>
>> Since the qcom DRI patches are in, I will look for a suitable LCD to add
>> support for. As I understand, I would need to extend drm_gralloc [1] to
>> provide freedreno, similar to nouveau and radeon. I can use the
>> kernel-msm [2] tree with x86's mesa and drm to build android. Is ifc6410
>> the intended target?
>
> +Emil who has done some work on android build system for libdrm/mesa/etc..
> note that we were talking on #dri-devel of the idea of pulling
> drm_gralloc into mesa git tree, which might be the better long term
> plan (assuming it can be made to work w/ the build system..  Emil
> knows the issues there better than I do)
>
> If you have access to an ifc6410 board, that would probably be a
> pretty good way to start.. on that device, the primary display is HDMI
> (which is already well supported in drm/msm), and we can use something
> very close to a mainline kernel[1].
>
> Obviously in the long run, it would be nice to get this working on
> some phones/tablets.. which would require backporting the upstream drm
> + DSI code, and writing panel drivers for the specific LCD panel in
> whichever phone/tablet.. but starting on ifc6410 could allow for some
> of that to happen in parallel, depending on exactly how much work is
> needed to get drm_gralloc working.
>
>
>> I am confused by the presence of freedreno in kitkat-x86 [3] - can it
>> build with freedreno already? I am digging into Android's build system,
>> kernel and graphics stack and will come up with a set of TODOs soon.
>
> so drm.git is libdrm.. so I think they just inherit the freedreno
> directory from upstream libdrm[2]
>
>
> I guess if android-x86 is already working with kitkat, that is a good
> sign..  although if simply getting freedreno working on android
> somehow works out to be too easy, there are various related tasks that
> could be interesting to consider as well:
>
>   1) hwcompositor support to use drm/kms planes to composite layers
> using the display controller instead of gpu..  there has been work
> happening on the kernel side (the new atomic[3] support).  The msm
> drm/kms driver already supports atomic, so this seems like a pretty
> logical next-step once the basics work
>   2) backporting drm and DSI stuff to some phone/tablet and writing
> panel driver is another good one
>
> [1] https://git.linaro.org/?p=landing-teams/working/qualcomm/kernel.git;a=shortlog;h=refs/heads/integration-linux-qcomlt
> [2] http://cgit.freedesktop.org/mesa/drm/tree/freedreno
> [3] http://blog.ffwll.ch/2015/01/update-for-atomic-display-updates.html
>
> BR,
> -R
>
>
>> [1] http://git.android-x86.org/?p=platform/hardware/drm_gralloc.git;a=tree
>> [2] https://github.com/freedreno/kernel-msm/tree/ifc6410-drm
>> [3]
>> http://git.android-x86.org/?p=platform/external/drm.git;a=tree;f=freedreno;h=46c7378baea9bdc2236e30674c5c4ebd1477bb1e;hb=kitkat-x86
>>
>> Thanks,
>> Varad
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