From: Ben Widawsky <ben@bwidawsk.net>
Date: Wed, 29 May 2013 02:22:18 +0000 (-0700)
Subject: drm/i915: Semaphore MBOX update generalization
X-Git-Tag: v3.11-rc1~65^2~105^2~24
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ad776f8b09d66e0145479fdbde2a710e5892441f;p=pandora-kernel.git

drm/i915: Semaphore MBOX update generalization

This replaces the existing MBOX update code with a more generalized
calculation for emitting mbox updates. We also create a sentinel for
doing the updates so we can more abstractly deal with the rings.

When doing MBOX updates the code must be aware of the /other/ rings.
Until now the platforms which supported semaphores had a fixed number of
rings and so it made sense for the code to be very specialized
(hardcoded).

The patch does contain a functional change, but should have no
behavioral changes.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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