From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Wed, 14 Nov 2012 09:15:14 +0000 (+0000)
Subject: drm/i915: Use LRI to update the semaphore registers
X-Git-Tag: v3.8-rc1~82^2~14^2~30
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1c8b46fc8c865189f562c9ab163d63863759712f;p=pandora-kernel.git

drm/i915: Use LRI to update the semaphore registers

The bspec was recently updated to remove the ability to update the
semaphore using the MI_SEMAPHORE_BOX command, the ability to wait upon
the semaphore value remained. Instead the advice is to update the
register using the MI_LOAD_REGISTER_IMM command. In cursory testing,
semaphores continue to function - the question is whether this fixes
some of the deadlocks where the semaphore registers contained stale
values?

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel J Blueman <daniel@quora.org>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---

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