From 334ae6b5271b7ba306b867d1d2b1b00e4afd6eb5 Mon Sep 17 00:00:00 2001
From: Thierry Reding <treding@nvidia.com>
Date: Fri, 14 Mar 2014 14:15:10 +0100
Subject: [PATCH] drm/tegra: dsi - Add enable guard

To prevent the enable or disable operations to potentially be run
multiple times, add guards to return early when the output is already
in the targetted state.

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