From: Alex Deucher <alexdeucher@gmail.com>
Date: Wed, 30 Apr 2014 13:27:15 +0000 (-0400)
Subject: drm/radeon/dp: check for errors in dpcd reads
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~207^2~2^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=aa019b791a3e138ca0eaa38e72b4ea97d482a7bc;p=pandora-kernel.git

drm/radeon/dp: check for errors in dpcd reads

Check to make sure the transaction succeeded before
using the register value.  Fixes occasional link training
problems.

Noticed-by: Sergei Antonov <saproj@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
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