From: Ben Widawsky <ben@bwidawsk.net>
Date: Mon, 25 Apr 2011 18:23:07 +0000 (-0700)
Subject: drm/i915: reference counted forcewake
X-Git-Tag: v3.0-rc3~42^2~49^2~27
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fcca7926299944841569515da321bef9655b7703;p=pandora-kernel.git

drm/i915: reference counted forcewake

Provide a reference count to track the forcewake state of the GPU and
give a safe mechanism for userspace to wake the GT. This also potentially
saves a UC read if the GT is known to be awake already.

The reference count is atomic, but the register access and hardware wake
sequence is protected by struct_mutex.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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