drm/dp/mst: Restore primary hub guid on resume

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commit 9dc0487d96 upstream.

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
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Lyude 2016-04-13 16:50:18 -04:00 • committed by Greg Kroah-Hartman

parent e51d7655d3

commit 3ae01ae65d

1 changed files with 12 additions and 0 deletions

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drivers/gpu/drm/drm_dp_mst_topology.c

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