From 7167d7c677ef066c56df276dc35b044c4840151a Mon Sep 17 00:00:00 2001
From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Thu, 7 Nov 2013 11:05:45 +0100
Subject: [PATCH] drm/i915: Optimize gen8_enable|disable_vblank functions
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Let's cache the IMR value like on other platforms. This is needed to
implement the underrun reporting since then we'll have two places that
change the same register at runtime.

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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