From: Paulo Zanoni <paulo.r.zanoni@intel.com>
Date: Tue, 29 Jan 2013 18:35:19 +0000 (-0200)
Subject: drm/i915: check the power down well on assert_pipe()
X-Git-Tag: v3.9-rc1~83^2~36^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=693101618a4beedf1b3d291860aee56c5fe44a1c;p=pandora-kernel.git

drm/i915: check the power down well on assert_pipe()

If the power well is disabled, we should not try to read its
registers, otherwise we'll get "unclaimed register" messages.

V2: Don't check whether the power well is enabled or not, just check
whether we asked it to be enabled or not: if we asked to disable the
power well, don't use the registers on it, even if it's still enabled.

V3: Fix bug that breaks all non-Haswell machines.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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