[PATCH hwc v1] [RFC] drm_hwcomposer: Flatten composition using writeback connector

[Alexandru-Cosmin Gheorghe]

Hi Stefan,

On Tue, Mar 13, 2018 at 07:20:33PM +0100, Stefan Schake wrote:
> Hey Alexandru,
> 
> On Tue, Mar 13, 2018 at 5:21 PM, Alexandru Gheorghe
> <alexandru-cosmin.gheorghe at arm.com> wrote:
> > This patchset tries to add support for using writeback connector to
> > flatten a scene when it doesn't change for a while. This idea had
> > been floated around on IRC here [1] and here [2].
> >
> > 2. Heuristic for triggering the flattening.
> > I just created a VSyncWorker which will trigger the flattening of the
> > scene if it doesn't change for 60 consecutive vsyncs. The countdown
> > gets reset every time ValidateDisplay is called. This is a relatively
> > basic heuristic, so I'm open to suggestions.
> 
> I think when Android deems that the display is sufficiently idle, it will
> disable VSync through setVsyncEnabled. Presumably we could just trigger the
> flattening on an enabled -> disabled transition?
> 
> Thanks,
> Stefan

I will look into it thanks.

-- 
Cheers,
Alex G