From: Imre Deak imre.deak@intel.com
[ Upstream commit dbaeef363ea54f4c18112874b77503c72ba60fec ]
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.... Signed-off-by: Thadeu Lima de Souza Cascardo cascardo@igalia.com --- drivers/gpu/drm/display/drm_dp_mst_topology.c | 27 +++++++++++++++++++ include/drm/display/drm_dp_mst_helper.h | 2 ++ 2 files changed, 29 insertions(+)
diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c index 2a6feb83f786..71a30387ca12 100644 --- a/drivers/gpu/drm/display/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c @@ -3685,6 +3685,33 @@ drm_dp_mst_topology_mgr_invalidate_mstb(struct drm_dp_mst_branch *mstb) drm_dp_mst_topology_mgr_invalidate_mstb(port->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 diff --git a/include/drm/display/drm_dp_mst_helper.h b/include/drm/display/drm_dp_mst_helper.h index ab1d73f93408..46705dacdd08 100644 --- a/include/drm/display/drm_dp_mst_helper.h +++ b/include/drm/display/drm_dp_mst_helper.h @@ -859,6 +859,8 @@ int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr); void drm_dp_mst_dump_topology(struct seq_file *m, struct drm_dp_mst_topology_mgr *mgr);
+void drm_dp_mst_topology_queue_probe(struct drm_dp_mst_topology_mgr *mgr); + void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr); int __must_check drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr,