[Bug 793339] kmssink: Renders at half my display refresh rate

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793339

--- Comment #4 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Hey Victor,

I think this patche partially fixes the issue I have describe here. It fixes it
for Atomic drivers, as the legacy implementation completely ignores async page
flip calls, and make a synchronous commit internally. So doing pageflip or
waiting for vlank with any atomic drivers means that you will likely wait for
an extra blank, hence reducing the render rate by two. It's partial, because
some driver ended up with that behaviour before their transition to atomic, to
get rid of the tearing.

There is the other issue I've showed you on IRC yesterday, and that one need
another bug, I'll file one today.

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