drm/dp/mst: Restore primary hub guid on resume
authorLyude <cpaul@redhat.com>
Wed, 13 Apr 2016 20:50:18 +0000 (16:50 -0400)
committerDave Airlie <airlied@redhat.com>
Tue, 26 Apr 2016 23:29:40 +0000 (09:29 +1000)
commit9dc0487d96a0396367a1451b31873482080b527f
treedc083818cc8043589069ae0ec9bb5bc9285ff38a
parent263efde31f97c498e1ebad30e4d2906609d7ad6b
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>
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
Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
drivers/gpu/drm/drm_dp_mst_topology.c