From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Wed, 2 May 2012 11:07:06 +0000 (+0100)
Subject: drm/i915: Do not read non-existent DPLL registers on PCH hardware
X-Git-Tag: v3.4-rc6~15^2~1^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=074b5e1a99fb5017122591d70098601e0484ca6a;p=pandora-kernel.git

drm/i915: Do not read non-existent DPLL registers on PCH hardware

We only execute intel_decrease_pllclock for pre-PCH hardware, typically
gen4 mobiles. However, in the variable declaration we did read from the
non-PCH DPLL register, quite naughty and detected by SandyBridge.

Reported-and-tested-by: Andrey Rahmatullin <wrar@wrar.name>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=49025
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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