From 596cc11e7a4a89bf6c45f955402d0bd0c7d51f13 Mon Sep 17 00:00:00 2001
From: Ben Widawsky <benjamin.widawsky@intel.com>
Date: Mon, 11 Nov 2013 14:46:28 -0800
Subject: [PATCH] drm/i915/bdw: PIPE_[BC] I[ME]R moved to powerwell

The pipe B and pipe C interrupt mask and enable registers are now part
of the pipe, so disabling the pipe power wells will lost the contests of
the registers.

Art totally debugged this one!

v2: Use the irq_lock to clarify code, and prevent future bugs (Daniel)

Cc: Art Runyan <arthur.j.runyan@intel.com>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
[danvet: Make sparse happy.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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