From: Mario Kleiner <mario.kleiner.de@gmail.com>
Date: Thu, 17 Jul 2014 00:24:45 +0000 (+0200)
Subject: drm/radeon: Make classic pageflip completion path less racy.
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~273^2^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5f87e090a7368adc2290ae17ffd82a070caadd20;p=pandora-kernel.git

drm/radeon: Make classic pageflip completion path less racy.

Need to protect mmio flip programming by event lock as well.

Need to also first enable pflip irq, then mmio program,
otherwise a flip completion may get unnoticed in the vblank
of actual completion if the flip is programmed, but
radeon_flip_work_func gets preempted immediately after
mmio programming and before vblank. In that case the
vblank irq handler wouldn't run radeon_crtc_handle_vblank()
with the completion check routine, miss the completed flip,
and only notice one vblank after actual completion, causing
a false/delayed report of flip completion.

Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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