[Bug 55500] [sna gen4] corrupt rendering (and flickering on redraw)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=55500

--- Comment #84 from Chris Wilson <chris at chris-wilson.co.uk> ---
Yes, that is characteristic of this bug. The internal vertex/texture
coordinates that are being passed along the GPU pipeline become corrupt (it
looks like we overflow a small ring buffer). The only effective approach I've
found so far has been to keep the number of rectangles inside the GPU pipeline
below a magic value - but that is quite tricky here, and the simplest seems to
be the big hammer that I stumbled upon for UXA. (Stumbled as it was an artifact
of the original implementation and fixes an entirely different GPU bug - an
immediate hang.)

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