From 222dc9a072e27b5069a7c03738e360eafdc2fdf5 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@amd.com>
Date: Mon, 8 Jul 2013 17:20:13 -0400
Subject: [PATCH] drm/radeon/dpm: fix display_gap programming on rv7xx

Check the driver state rather than the register as the
crtc registers may not be enabled yet.

Should fix:
https://bugzilla.kernel.org/show_bug.cgi?id=60510
https://bugs.freedesktop.org/show_bug.cgi?id=66651

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