[PATCH weston 0/3 v2] DRM lease support

[Daniel Stone]

Hi all,

On 13 February 2018 at 11:02, Marius-cristian Vlad
<marius-cristian.vlad at nxp.com> wrote:
> The sample client I've posted seems to be using the overlay plane.
> Also, Daniel Stone confirmed a while back that they can be used.
>
> However it seems that page flipping on the overlay plane can not
> be used if the connector is used in the same time (and I'm not
> treating that case -- I disable that connector before handling out the
> lease). Or primary plane -> page flipping, overlay -> wait for vblank?
>
> Looking briefly over weston code I see that for overlay planes they use
> wait for vblank mechanism. Maybe Daniel/Pekka can confirm this, or
> maybe this is an issue with legacy API and atomic doesn't suffer from
> this problem. I'm not 100% sure.
>
> I guess it would be interesting to see if we can use it in the same
> time.

With the atomic API at least, overlay planes cannot be driven
separately from other planes on that CRTC. Atomic only allows one
commit per CRTC per vblank: either you hand out CRTCs in their
entirety, or when you lease an overlay plane to a client, you stop
updating anything else on that CRTC.

Cheers,
Daniel