tree c410500d6aae5314a2be50196d1e9efb687144a8
parent 3b333c55485fef0089ae7398906599d000df195e
author Alex Deucher <alexdeucher@gmail.com> 1398864435 -0400
committer Christian König <christian.koenig@amd.com> 1398940089 +0200

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>