From 23d0b13036d14257ae4d226209cd7845f25af8e0 Mon Sep 17 00:00:00 2001
From: Ben Widawsky <benjamin.widawsky@linux.intel.com>
Date: Thu, 10 Apr 2014 14:32:41 -0700
Subject: [PATCH] drm/i915/bdw: Add 42ms delay for IPS disable

This is a requirement added to the spec. This patch will prevent
persistent corruption on the display.

v2: Make the wait before the vblank wait. (Art)
Try to finish early by polling the register
s/present/prevent (Chris)

Cc: Art Runyan <arthur.j.runyan@intel.com>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
[danvet: Upgrade debug output to ERROR.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Reading git-format-patch failed