From c4756baa4a8ba75b812506818cbc81178650d3c1 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@amd.com>
Date: Wed, 15 Jan 2014 13:59:47 -0500
Subject: [PATCH] drm/radeon: bail early from enable ss in certain cases

If the ss percentage is 0 or we are using external ss,
just bail when enabling ss.  We disable it explicitly
earlier in the modeset already.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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