drm/dp/mst: Restore primary hub guid on resume
authorLyude <cpaul@redhat.com>
Wed, 13 Apr 2016 20:50:18 +0000 (16:50 -0400)
committerDaniel Vetter <daniel.vetter@ffwll.ch>
Fri, 15 Apr 2016 13:01:16 +0000 (15:01 +0200)
commit1652fce65f70f104ffd0df0284b601d9103e1ebf
tree976cf170b3cb8caa811091eea63e208b54fa0045
parentf6cd7daecff558fab2c45d15283d3e52f688342d
drm/dp/mst: Restore primary hub guid on resume

Some hubs are forgetful, and end up forgetting whatever GUID we set
previously after we do a suspend/resume cycle. This can lead to
hotplugging breaking (along with probably other things) since the hub
will start sending connection notifications with the wrong GUID. As
such, we need to check on resume whether or not the GUID the hub is
giving us is valid.

Signed-off-by: Lyude <cpaul@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1460580618-7421-1-git-send-email-cpaul@redhat.com
drivers/gpu/drm/drm_dp_mst_topology.c