[Mesa-dev] Testing drm_hwcomposer in RPi

chris simmonds smoog11 at googlemail.com
Mon Jun 25 20:32:27 UTC 2018

Hi Stefan,

On 25 June 2018 at 18:09, Stefan Schake <stschake at gmail.com> wrote:

> Hey Chris,
> On Fri, Jun 22, 2018 at 12:09 PM, chris simmonds <smoog11 at googlemail.com>
> wrote:
> > Hi.
> >
> > I would like to try out drm_hwcomposer on a RPi 3. Can anyone point me
> to a
> > howto or something that tells me how?
> >
> > FYI, this is part of a side project to port drm_hwcomposer to BeagleBones
> > and other things based on TI SoCs
> >
> > Thanks,
> > Chris Simmonds
> So Mesa is really only transitively related to drm_hwc, in that you need
> a graphics driver with Android native fence support. For Mesa and the VC4
> GPU on the RPi specifically, that's supported in a very recent Mesa version
> in combination with a very recent kernel that has the VC4 syncobj support.
> The earliest kernel version that has this is 4.18-rc1, but it can be
> backported relatively painlessly to 4.14, which is what the android-kernel
> tree uses and works on Oreo upwards. No released Mesa version has the
> support yet, but master can be made to work with AOSP.
> As you can tell, there is no howto or anything - this is all pretty
> bleeding edge and you'll need to do some indepth sleuthing to get it
> to work. If you hit any specific problems, the best point to get help
> is the drm-hwcomposer project on the freedesktop gitlab:
> https://gitlab.freedesktop.org/drm-hwcomposer/drm-hwcomposer
> Thanks,
> Stefan

Thank you for clarifying things. It looks like there is a bit of work to do
here, but there's the whole summer ahead.

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