diff options
| author | Imre Deak <imre.deak@intel.com> | 2024-07-22 19:54:51 +0300 |
|---|---|---|
| committer | Imre Deak <imre.deak@intel.com> | 2024-07-31 18:45:56 +0300 |
| commit | dbaeef363ea54f4c18112874b77503c72ba60fec (patch) | |
| tree | b5ed1142ef94ae8fb36002c431d6c7373b68f7cf /drivers/gpu/drm/display | |
| parent | e9b36c5be2e7fdef2cc933c1dac50bd81881e9b8 (diff) | |
| download | lwn-dbaeef363ea54f4c18112874b77503c72ba60fec.tar.gz lwn-dbaeef363ea54f4c18112874b77503c72ba60fec.zip | |
drm/dp_mst: Add a helper to queue a topology probe
A follow up i915 patch will need to reprobe the MST topology after the
initial probing, add a helper for this.
Cc: Lyude Paul <lyude@redhat.com>
Cc: dri-devel@lists.freedesktop.org
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240722165503.2084999-3-imre.deak@intel.com
Diffstat (limited to 'drivers/gpu/drm/display')
| -rw-r--r-- | drivers/gpu/drm/display/drm_dp_mst_topology.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c index eb1b7b286b76..0fbc9bbed5d8 100644 --- a/drivers/gpu/drm/display/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c @@ -3729,6 +3729,33 @@ drm_dp_mst_topology_mgr_invalidate_mstb(struct drm_dp_mst_branch *mstb) } /** + * drm_dp_mst_topology_queue_probe - Queue a topology probe + * @mgr: manager to probe + * + * Queue a work to probe the MST topology. Driver's should call this only to + * sync the topology's HW->SW state after the MST link's parameters have + * changed in a way the state could've become out-of-sync. This is the case + * for instance when the link rate between the source and first downstream + * branch device has switched between UHBR and non-UHBR rates. Except of those + * cases - for instance when a sink gets plugged/unplugged to a port - the SW + * state will get updated automatically via MST UP message notifications. + */ +void drm_dp_mst_topology_queue_probe(struct drm_dp_mst_topology_mgr *mgr) +{ + mutex_lock(&mgr->lock); + + if (drm_WARN_ON(mgr->dev, !mgr->mst_state || !mgr->mst_primary)) + goto out_unlock; + + drm_dp_mst_topology_mgr_invalidate_mstb(mgr->mst_primary); + drm_dp_mst_queue_probe_work(mgr); + +out_unlock: + mutex_unlock(&mgr->lock); +} +EXPORT_SYMBOL(drm_dp_mst_topology_queue_probe); + +/** * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager * @mgr: manager to suspend * |