From 337ba0175f49b2d3a0bcc893f97f539bda831007 Mon Sep 17 00:00:00 2001
From: Paulo Zanoni <paulo.r.zanoni@intel.com>
Date: Tue, 1 Apr 2014 15:37:16 -0300
Subject: [PATCH] drm/i915: check if IIR is still zero at postinstall on Gen5+

It should already be masked and disabled and zeroed at the preinstall
and uninstall stages. Also, the current code just writes to IIR once,
and this is not a guarantee that it will be cleared, so it's wrong
anyway.

The whole reason for the paranoia is that we're going to start calling
the IRQ preinstall/postinstall/uninstall from the runtime PM
callbacks, so we need to make sure everything is behaving as expected.

v2: - Change the original DRM_ERROR to WARN and clear IIR in case it's
      not zero (Ben).
    - Improve commit message (Daniel).

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