drm: Read DP branch device id
Read DisplayPort branch device id string. Reviewed-by: NJim Bride <jim.bride@linux.intel.com> Signed-off-by: NMika Kahola <mika.kahola@intel.com> Acked-by: NDave Airlie <airlied@gmail.com> Signed-off-by: NJani Nikula <jani.nikula@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1473419458-17080-6-git-send-email-mika.kahola@intel.com
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