From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Sun, 20 Jan 2013 16:11:20 +0000 (+0000)
Subject: drm/i915: Disable AsyncFlip performance optimisations
X-Git-Tag: v3.2.38~39
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a2d2dcd9e1aa9585e2ffb757ce7f3fc80bcad9f1;p=pandora-kernel.git

drm/i915: Disable AsyncFlip performance optimisations

commit 1c8c38c588ea91f8deeae21284840459d1bb58e3 upstream.

This is a required workarounds for all products, especially on gen6+
where it causes the command streamer to fail to parse instructions
following a WAIT_FOR_EVENT. We use WAIT_FOR_EVENT for synchronising
between the GPU and the display engines, and so this bit being unset may
cause hangs.

References: https://bugzilla.kernel.org/show_bug.cgi?id=52311
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
[bwh: Backported to 3.2:
 - Adjust context
 - s/_MASKED_BIT/GFX_MODE/]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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