[Bug 68718] [snb] vsync hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68718

--- Comment #16 from Chris Wilson <chris at chris-wilson.co.uk> ---
Created attachment 93855
  --> https://bugs.freedesktop.org/attachment.cgi?id=93855&action=edit
Serialise DERRMR write

Sorry, I thought I was being clear when I acknowledged the hang still occurred
with rc6, and so we need an explanation that doesn't involve rc6.

Attached is a patch to serialise the write to DERRMR prior to us loading the
scanline window and waiting upon the result. We've tried this in the past but
it didn't seem to make any improvement (though iirc that was in connection with
rc6 hangs + vsync).

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