[Bug 18542] [PATCH] Textured Video (XV) tearing.

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=18542





--- Comment #14 from Pierre Ossman <drzeus-bugzilla at drzeus.cx>  2008-11-20 10:58:41 PST ---
For reference, the nouveau driver does the same thing and it works just fine.

The rendering is done through two triangles, not through a blit. So it isn't
just top to bottom, but two passes, once for each triangle.

I've been fiddling around a bit, and it seems like the chip is only able to
trigger on the rising edge, nothing else. I can determine this by the fact that
a) the tear occurs at random places between runs, indicating that it does not
have a stable reference point, and b) a torture test does not get rate limited
to the refresh rate.

(a and b are of course giving stable results with the rising edge trigger)

I've been unable to find documentation for this register, so I have no idea how
this is supposed to work except for Alex' code.


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