From 86df256f301fc5f215160d8c8e7093f605d40a14 Mon Sep 17 00:00:00 2001
From: Thierry Reding <treding@nvidia.com>
Date: Mon, 8 Dec 2014 16:03:53 +0100
Subject: [PATCH] drm/tegra: dc: Wait for idle when disabled

When disabling the display controller, stop it and wait for it to become
idle. Doing so ensures that no further accesses to the framebuffer occur
and the buffers can be safely unmapped or freed.

Signed-off-by: Thierry Reding <treding@nvidia.com>
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