From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Thu, 4 Oct 2012 17:20:03 +0000 (+0200)
Subject: drm/i915: paper over a pipe-enable vs pageflip race
X-Git-Tag: v3.7-rc2~38^2~5^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6ce9410047f9f06c1b3336d5215402b77d6fd70f;p=pandora-kernel.git

drm/i915: paper over a pipe-enable vs pageflip race

I've discovered this on my ivb machine while stress-testing the new
flip_tests. Only harmful effect observed is that the timestamp is a
bit bogus.

Note that this is empirical duct-tape: I've noticed that we seem to
only ever miss the very first vblank irq right after enabling the
pipe. And with this hack applied I couldn't reproduce the failure case
anywhere else any more.

Tested-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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