From: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Date: Mon, 10 Dec 2012 13:41:48 +0000 (+0200)
Subject: drm/i915: Don't emit semaphore wait if wrap happened
X-Git-Tag: v3.9-rc1~83^2~40^2~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f72b3435c1a75406d82d6e252bb78f009efd4bd9;p=pandora-kernel.git

drm/i915: Don't emit semaphore wait if wrap happened

If wrap just happened we need to prevent emitting waits for
pre wrap values. Detect this and emit no-ops instead.

v2: Use olr > seqno to detect wrap instead of *seqno == 0
as suggested by Chris Wilson.

v3: Use last used seqno to detect the wraparound. From
Chris Wilson

v4: Fixed unnecessary last_seqno assigment

References: https://bugs.freedesktop.org/show_bug.cgi?id=57967
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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