From: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date: Wed, 6 Aug 2014 11:49:46 +0000 (+0300)
Subject: drm: Don't clear vblank timestamps when vblank interrupt is disabled
X-Git-Tag: fixes-against-v3.18-rc2~73^2~39^2~20
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=844b03f27739135fe1fed2fef06da0ffc4c7a081;p=pandora-kernel.git

drm: Don't clear vblank timestamps when vblank interrupt is disabled

Clearing the timestamps causes us to send zeroed timestamps to userspace
if they get sent out in response to the drm_vblank_off(). It's better
to send the very latest timestamp and count instead.

Testcase: igt/kms_flip/modeset-vs-vblank-race
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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