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drm: distinguish return value of drm_dp_check_and_send_link_address

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drm_dp_check_and_send_link_address discovers MST device topology. It can
return both positive and negative values. When it returns positive
values there is no error found. If it returns negative values there is
error found, such as get NAK , timeout, etc. Following
drm_kms_helper_hotplug_event should be called when
drm_dp_check_and_send_link_address returns positive value.

Signed-off-by: Xiaogang Chen <xiaogang.chen@amd.com>
Acked-by: Simon Ser <contact@emersion.fr>
Signed-off-by: Simon Ser <contact@emersion.fr> (re-formatted commit message)
Link: https://patchwork.freedesktop.org/patch/msgid/DM6PR12MB2602B6281BF8C9430115E03BE3AA0@DM6PR12MB2602.namprd12.prod.outlook.com
This commit is contained in:
Xiaogang Chen 2021-01-12 06:36:52 +00:00 committed by Simon Ser
parent 7e60bdeb91
commit dc25e3776e
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GPG Key ID: 0FDE7BE0E88F5E48
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/drm_dp_mst_topology.c
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@ -2751,7 +2751,7 @@ static void drm_dp_mst_link_probe_work(struct work_struct *work)
drm_dp_mst_topology_put_mstb(mstb);
mutex_unlock(&mgr->probe_lock);
if (ret)
if (ret > 0)
drm_kms_helper_hotplug_event(dev);
}