tree 59b134cd2408654a10993452faa090ea5e85f6f0
parent c77d7162a7ae451c2e895d7ef7fbeb0906107472
author Daniel Vetter <daniel.vetter@ffwll.ch> 1349371203 +0200
committer Daniel Vetter <daniel.vetter@ffwll.ch> 1349717464 +0200

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>