From: Mario Kleiner <mario.kleiner.de@gmail.com>
Date: Wed, 19 Mar 2014 09:02:11 +0000 (+0100)
Subject: drm/nouveau: fix small thinko in vblank timestamping.
X-Git-Tag: v3.15-rc1~51^2~39^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6c3252bc83155ae69d78fefdc7458aa64d8a87db;p=pandora-kernel.git

drm/nouveau: fix small thinko in vblank timestamping.

*hpos horizontal scanout position doesn't need to be corrected
to count the pixels between hactive end and htotal negative.
That is only needed for *vpos to count lines until end of
vblank for the vblank timestamping.

Use hpos as is without correction.

Removes occassional spikes in timestamps of up to 1 scanline
duration, thereby improves accuracy to about +/- 2 usecs instead
of +/- 12 usecs, wrt. true onset time as measured with high
precision equipment on NV-A5.

Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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