From: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Date: Thu, 5 Feb 2015 16:41:48 +0000 (+0200)
Subject: drm/i915: Take runtime pm reference on hangcheck_info
X-Git-Tag: fixes-v4.0-rc1~91^2~3^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ebbc7546d2099c94ff2ea940ae5ce740e512a66d;p=pandora-kernel.git

drm/i915: Take runtime pm reference on hangcheck_info

We read the coherent current seqno and actual head from ring.
For hardware access we need to take runtime_pm reference.

Get hardware specific values with runtime reference held
and print them first to emphasize hw state vs bookkeepping.

v2: Reorder output according to hw access (Chris)
    remove superfluous locking (Daniel)

Testcase: igt/pm_rpm/debugfs-read
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=88910
Tested-by: Ding Heng <hengx.ding@intel.com> (v1)
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
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