diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
index 5ec14efd4d8cb..f8214acf70b32 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
@@ -123,21 +123,6 @@ static ssize_t dm_dp_aux_transfer(struct drm_dp_aux *aux,
return result;
}
-static enum drm_connector_status
-dm_dp_mst_detect(struct drm_connector *connector, bool force)
-{
- struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
- struct amdgpu_dm_connector *master = aconnector->mst_port;
-
- enum drm_connector_status status =
- drm_dp_mst_detect_port(
- connector,
- &master->mst_mgr,
- aconnector->port);
-
- return status;
-}
-
static void
dm_dp_mst_connector_destroy(struct drm_connector *connector)
{
@@ -177,7 +162,6 @@ amdgpu_dm_mst_connector_early_unregister(struct drm_connector *connector)
}
static const struct drm_connector_funcs dm_dp_mst_connector_funcs = {
- .detect = dm_dp_mst_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = dm_dp_mst_connector_destroy,
.reset = amdgpu_dm_connector_funcs_reset,
@@ -252,10 +236,22 @@ static struct drm_encoder *dm_mst_best_encoder(struct drm_connector *connector)
return &amdgpu_dm_connector->mst_encoder->base;
}
+static int
+dm_dp_mst_detect(struct drm_connector *connector,
+ struct drm_modeset_acquire_ctx *ctx, bool force)
+{
+ struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
+ struct amdgpu_dm_connector *master = aconnector->mst_port;
+
+ return drm_dp_mst_detect_port(connector, ctx, &master->mst_mgr,
+ aconnector->port);
+}
+
static const struct drm_connector_helper_funcs dm_dp_mst_connector_helper_funcs = {
.get_modes = dm_dp_mst_get_modes,
.mode_valid = amdgpu_dm_connector_mode_valid,
.best_encoder = dm_mst_best_encoder,
+ .detect_ctx = dm_dp_mst_detect,
};
static void amdgpu_dm_encoder_destroy(struct drm_encoder *encoder)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index 2f87dec31c3cd..55f289eebea7e 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -1905,6 +1905,78 @@ void drm_dp_mst_connector_early_unregister(struct drm_connector *connector,
}
EXPORT_SYMBOL(drm_dp_mst_connector_early_unregister);
+static void
+drm_dp_mst_port_add_connector(struct drm_dp_mst_branch *mstb,
+ struct drm_dp_mst_port *port)
+{
+ struct drm_dp_mst_topology_mgr *mgr = port->mgr;
+ char proppath[255];
+ int ret;
+
+ build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath));
+ port->connector = mgr->cbs->add_connector(mgr, port, proppath);
+ if (!port->connector) {
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ if ((port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV ||
+ port->pdt == DP_PEER_DEVICE_SST_SINK) &&
+ port->port_num >= DP_MST_LOGICAL_PORT_0) {
+ port->cached_edid = drm_get_edid(port->connector,
+ &port->aux.ddc);
+ drm_connector_set_tile_property(port->connector);
+ }
+
+ mgr->cbs->register_connector(port->connector);
+ return;
+
+error:
+ DRM_ERROR("Failed to create connector for port %p: %d\n", port, ret);
+}
+
+/*
+ * Drop a topology reference, and unlink the port from the in-memory topology
+ * layout
+ */
+static void
+drm_dp_mst_topology_unlink_port(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_port *port)
+{
+ mutex_lock(&mgr->lock);
+ list_del(&port->next);
+ mutex_unlock(&mgr->lock);
+ drm_dp_mst_topology_put_port(port);
+}
+
+static struct drm_dp_mst_port *
+drm_dp_mst_add_port(struct drm_device *dev,
+ struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_branch *mstb, u8 port_number)
+{
+ struct drm_dp_mst_port *port = kzalloc(sizeof(*port), GFP_KERNEL);
+
+ if (!port)
+ return NULL;
+
+ kref_init(&port->topology_kref);
+ kref_init(&port->malloc_kref);
+ port->parent = mstb;
+ port->port_num = port_number;
+ port->mgr = mgr;
+ port->aux.name = "DPMST";
+ port->aux.dev = dev->dev;
+ port->aux.is_remote = true;
+
+ /*
+ * Make sure the memory allocation for our parent branch stays
+ * around until our own memory allocation is released
+ */
+ drm_dp_mst_get_mstb_malloc(mstb);
+
+ return port;
+}
+
static void
drm_dp_mst_handle_link_address_port(struct drm_dp_mst_branch *mstb,
struct drm_device *dev,
@@ -1912,35 +1984,40 @@ drm_dp_mst_handle_link_address_port(struct drm_dp_mst_branch *mstb,
{
struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;
struct drm_dp_mst_port *port;
- bool created = false;
- int old_ddps = 0;
+ int old_ddps = 0, ret;
+ u8 new_pdt = DP_PEER_DEVICE_NONE;
+ bool created = false, send_link_addr = false;
port = drm_dp_get_port(mstb, port_msg->port_number);
if (!port) {
- port = kzalloc(sizeof(*port), GFP_KERNEL);
+ port = drm_dp_mst_add_port(dev, mgr, mstb,
+ port_msg->port_number);
if (!port)
return;
- kref_init(&port->topology_kref);
- kref_init(&port->malloc_kref);
- port->parent = mstb;
- port->port_num = port_msg->port_number;
- port->mgr = mgr;
- port->aux.name = "DPMST";
- port->aux.dev = dev->dev;
- port->aux.is_remote = true;
-
- /*
- * Make sure the memory allocation for our parent branch stays
- * around until our own memory allocation is released
+ created = true;
+ } else if (port_msg->input_port && !port->input && port->connector) {
+ /* Destroying the connector is impossible in this context, so
+ * replace the port with a new one
*/
- drm_dp_mst_get_mstb_malloc(mstb);
+ drm_dp_mst_topology_unlink_port(mgr, port);
+ drm_dp_mst_topology_put_port(port);
+ port = drm_dp_mst_add_port(dev, mgr, mstb,
+ port_msg->port_number);
+ if (!port)
+ return;
created = true;
} else {
+ /* Locking is only needed when the port has a connector
+ * exposed to userspace
+ */
+ drm_modeset_lock(&mgr->base.lock, NULL);
old_ddps = port->ddps;
}
port->input = port_msg->input_port;
+ if (!port->input)
+ new_pdt = port_msg->peer_device_type;
port->mcs = port_msg->mcs;
port->ddps = port_msg->ddps;
port->ldps = port_msg->legacy_device_plug_status;
@@ -1968,59 +2045,39 @@ drm_dp_mst_handle_link_address_port(struct drm_dp_mst_branch *mstb,
}
}
- if (!port->input) {
- int ret = drm_dp_port_set_pdt(port,
- port_msg->peer_device_type);
- if (ret == 1) {
- drm_dp_send_link_address(mgr, port->mstb);
- } else if (ret < 0) {
- DRM_ERROR("Failed to change PDT on port %p: %d\n",
- port, ret);
- goto fail;
- }
+ ret = drm_dp_port_set_pdt(port, new_pdt);
+ if (ret == 1) {
+ send_link_addr = true;
+ } else if (ret < 0) {
+ DRM_ERROR("Failed to change PDT on port %p: %d\n",
+ port, ret);
+ goto fail;
}
- if (created && !port->input) {
- char proppath[255];
-
- build_mst_prop_path(mstb, port->port_num, proppath,
- sizeof(proppath));
- port->connector = (*mgr->cbs->add_connector)(mgr, port,
- proppath);
- if (!port->connector)
- goto fail;
-
- if ((port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV ||
- port->pdt == DP_PEER_DEVICE_SST_SINK) &&
- port->port_num >= DP_MST_LOGICAL_PORT_0) {
- port->cached_edid = drm_get_edid(port->connector,
- &port->aux.ddc);
- drm_connector_set_tile_property(port->connector);
- }
+ if (!created)
+ drm_modeset_unlock(&mgr->base.lock);
+ else if (!port->connector && !port->input)
+ drm_dp_mst_port_add_connector(mstb, port);
- (*mgr->cbs->register_connector)(port->connector);
- }
+ if (send_link_addr && port->mstb)
+ drm_dp_send_link_address(mgr, port->mstb);
/* put reference to this port */
drm_dp_mst_topology_put_port(port);
return;
fail:
- /* Remove it from the port list */
- mutex_lock(&mgr->lock);
- list_del(&port->next);
- mutex_unlock(&mgr->lock);
-
- /* Drop the port list reference */
- drm_dp_mst_topology_put_port(port);
- /* And now drop our reference */
+ drm_dp_mst_topology_unlink_port(mgr, port);
drm_dp_mst_topology_put_port(port);
+ if (!created)
+ drm_modeset_unlock(&mgr->base.lock);
}
static void
drm_dp_mst_handle_conn_stat(struct drm_dp_mst_branch *mstb,
struct drm_dp_connection_status_notify *conn_stat)
{
+ struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;
struct drm_dp_mst_port *port;
int old_ddps;
bool dowork = false;
@@ -2029,6 +2086,10 @@ drm_dp_mst_handle_conn_stat(struct drm_dp_mst_branch *mstb,
if (!port)
return;
+ /* Locking is only needed if the port's exposed to userspace */
+ if (port->connector)
+ drm_modeset_lock(&mgr->base.lock, NULL);
+
old_ddps = port->ddps;
port->mcs = conn_stat->message_capability_status;
port->ldps = conn_stat->legacy_device_plug_status;
@@ -2054,10 +2115,12 @@ drm_dp_mst_handle_conn_stat(struct drm_dp_mst_branch *mstb,
}
}
+ if (port->connector)
+ drm_modeset_unlock(&mgr->base.lock);
+
drm_dp_mst_topology_put_port(port);
if (dowork)
queue_work(system_long_wq, &mstb->mgr->work);
-
}
static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr,
@@ -2157,8 +2220,11 @@ static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *m
if (port->input || !port->ddps)
continue;
- if (!port->available_pbn)
+ if (!port->available_pbn) {
+ drm_modeset_lock(&mgr->base.lock, NULL);
drm_dp_send_enum_path_resources(mgr, mstb, port);
+ drm_modeset_unlock(&mgr->base.lock);
+ }
if (port->mstb)
mstb_child = drm_dp_mst_topology_get_mstb_validated(
@@ -2189,11 +2255,16 @@ static void drm_dp_mst_link_probe_work(struct work_struct *work)
mstb = NULL;
}
mutex_unlock(&mgr->lock);
- if (mstb) {
- drm_dp_check_and_send_link_address(mgr, mstb);
- drm_dp_mst_topology_put_mstb(mstb);
+ if (!mstb) {
+ mutex_unlock(&mgr->probe_lock);
+ return;
}
+
+ drm_dp_check_and_send_link_address(mgr, mstb);
+ drm_dp_mst_topology_put_mstb(mstb);
+
mutex_unlock(&mgr->probe_lock);
+ drm_kms_helper_hotplug_event(dev);
}
static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
@@ -2478,8 +2549,6 @@ static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
drm_dp_mst_handle_link_address_port(mstb, mgr->dev,
&reply->ports[i]);
- drm_kms_helper_hotplug_event(mgr->dev);
-
out:
if (ret <= 0)
mstb->link_address_sent = false;
@@ -3274,13 +3343,14 @@ static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr)
return 0;
}
-static inline void
+static inline bool
drm_dp_mst_process_up_req(struct drm_dp_mst_topology_mgr *mgr,
struct drm_dp_pending_up_req *up_req)
{
struct drm_dp_mst_branch *mstb = NULL;
struct drm_dp_sideband_msg_req_body *msg = &up_req->msg;
struct drm_dp_sideband_msg_hdr *hdr = &up_req->hdr;
+ bool hotplug = false;
if (hdr->broadcast) {
const u8 *guid = NULL;
@@ -3298,16 +3368,17 @@ drm_dp_mst_process_up_req(struct drm_dp_mst_topology_mgr *mgr,
if (!mstb) {
DRM_DEBUG_KMS("Got MST reply from unknown device %d\n",
hdr->lct);
- return;
+ return false;
}
/* TODO: Add missing handler for DP_RESOURCE_STATUS_NOTIFY events */
if (msg->req_type == DP_CONNECTION_STATUS_NOTIFY) {
drm_dp_mst_handle_conn_stat(mstb, &msg->u.conn_stat);
- drm_kms_helper_hotplug_event(mgr->dev);
+ hotplug = true;
}
drm_dp_mst_topology_put_mstb(mstb);
+ return hotplug;
}
static void drm_dp_mst_up_req_work(struct work_struct *work)
@@ -3316,6 +3387,7 @@ static void drm_dp_mst_up_req_work(struct work_struct *work)
container_of(work, struct drm_dp_mst_topology_mgr,
up_req_work);
struct drm_dp_pending_up_req *up_req;
+ bool send_hotplug = false;
mutex_lock(&mgr->probe_lock);
while (true) {
@@ -3330,10 +3402,13 @@ static void drm_dp_mst_up_req_work(struct work_struct *work)
if (!up_req)
break;
- drm_dp_mst_process_up_req(mgr, up_req);
+ send_hotplug |= drm_dp_mst_process_up_req(mgr, up_req);
kfree(up_req);
}
mutex_unlock(&mgr->probe_lock);
+
+ if (send_hotplug)
+ drm_kms_helper_hotplug_event(mgr->dev);
}
static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr)
@@ -3441,22 +3516,31 @@ EXPORT_SYMBOL(drm_dp_mst_hpd_irq);
/**
* drm_dp_mst_detect_port() - get connection status for an MST port
* @connector: DRM connector for this port
+ * @ctx: The acquisition context to use for grabbing locks
* @mgr: manager for this port
- * @port: unverified pointer to a port
+ * @port: pointer to a port
*
- * This returns the current connection state for a port. It validates the
- * port pointer still exists so the caller doesn't require a reference
+ * This returns the current connection state for a port.
*/
-enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector,
- struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
+int
+drm_dp_mst_detect_port(struct drm_connector *connector,
+ struct drm_modeset_acquire_ctx *ctx,
+ struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_port *port)
{
- enum drm_connector_status status = connector_status_disconnected;
+ int ret;
/* we need to search for the port in the mgr in case it's gone */
port = drm_dp_mst_topology_get_port_validated(mgr, port);
if (!port)
return connector_status_disconnected;
+ ret = drm_modeset_lock(&mgr->base.lock, ctx);
+ if (ret)
+ goto out;
+
+ ret = connector_status_disconnected;
+
if (!port->ddps)
goto out;
@@ -3466,7 +3550,7 @@ enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector
break;
case DP_PEER_DEVICE_SST_SINK:
- status = connector_status_connected;
+ ret = connector_status_connected;
/* for logical ports - cache the EDID */
if (port->port_num >= 8 && !port->cached_edid) {
port->cached_edid = drm_get_edid(connector, &port->aux.ddc);
@@ -3474,12 +3558,12 @@ enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector
break;
case DP_PEER_DEVICE_DP_LEGACY_CONV:
if (port->ldps)
- status = connector_status_connected;
+ ret = connector_status_connected;
break;
}
out:
drm_dp_mst_topology_put_port(port);
- return status;
+ return ret;
}
EXPORT_SYMBOL(drm_dp_mst_detect_port);
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index bbcab27644dcd..a9962846a5039 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -391,20 +391,7 @@ static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)
return ret;
}
-static enum drm_connector_status
-intel_dp_mst_detect(struct drm_connector *connector, bool force)
-{
- struct intel_connector *intel_connector = to_intel_connector(connector);
- struct intel_dp *intel_dp = intel_connector->mst_port;
-
- if (drm_connector_is_unregistered(connector))
- return connector_status_disconnected;
- return drm_dp_mst_detect_port(connector, &intel_dp->mst_mgr,
- intel_connector->port);
-}
-
static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
- .detect = intel_dp_mst_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.atomic_get_property = intel_digital_connector_atomic_get_property,
.atomic_set_property = intel_digital_connector_atomic_set_property,
@@ -465,11 +452,26 @@ static struct drm_encoder *intel_mst_atomic_best_encoder(struct drm_connector *c
return &intel_dp->mst_encoders[crtc->pipe]->base.base;
}
+static int
+intel_dp_mst_detect(struct drm_connector *connector,
+ struct drm_modeset_acquire_ctx *ctx, bool force)
+{
+ struct intel_connector *intel_connector = to_intel_connector(connector);
+ struct intel_dp *intel_dp = intel_connector->mst_port;
+
+ if (drm_connector_is_unregistered(connector))
+ return connector_status_disconnected;
+
+ return drm_dp_mst_detect_port(connector, ctx, &intel_dp->mst_mgr,
+ intel_connector->port);
+}
+
static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_funcs = {
.get_modes = intel_dp_mst_get_modes,
.mode_valid = intel_dp_mst_mode_valid,
.atomic_best_encoder = intel_mst_atomic_best_encoder,
.atomic_check = intel_dp_mst_atomic_check,
+ .detect_ctx = intel_dp_mst_detect,
};
static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
index a13924ae1992a..a9d6aa110cfd0 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
@@ -986,20 +986,11 @@ nv50_mstc_atomic_check(struct drm_connector *connector,
return drm_dp_atomic_release_vcpi_slots(state, mgr, mstc->port);
}
-static const struct drm_connector_helper_funcs
-nv50_mstc_help = {
- .get_modes = nv50_mstc_get_modes,
- .mode_valid = nv50_mstc_mode_valid,
- .best_encoder = nv50_mstc_best_encoder,
- .atomic_best_encoder = nv50_mstc_atomic_best_encoder,
- .atomic_check = nv50_mstc_atomic_check,
-};
-
-static enum drm_connector_status
-nv50_mstc_detect(struct drm_connector *connector, bool force)
+static int
+nv50_mstc_detect(struct drm_connector *connector,
+ struct drm_modeset_acquire_ctx *ctx, bool force)
{
struct nv50_mstc *mstc = nv50_mstc(connector);
- enum drm_connector_status conn_status;
int ret;
if (drm_connector_is_unregistered(connector))
@@ -1009,14 +1000,24 @@ nv50_mstc_detect(struct drm_connector *connector, bool force)
if (ret < 0 && ret != -EACCES)
return connector_status_disconnected;
- conn_status = drm_dp_mst_detect_port(connector, mstc->port->mgr,
- mstc->port);
+ ret = drm_dp_mst_detect_port(connector, ctx, mstc->port->mgr,
+ mstc->port);
pm_runtime_mark_last_busy(connector->dev->dev);
pm_runtime_put_autosuspend(connector->dev->dev);
- return conn_status;
+ return ret;
}
+static const struct drm_connector_helper_funcs
+nv50_mstc_help = {
+ .get_modes = nv50_mstc_get_modes,
+ .mode_valid = nv50_mstc_mode_valid,
+ .best_encoder = nv50_mstc_best_encoder,
+ .atomic_best_encoder = nv50_mstc_atomic_best_encoder,
+ .atomic_check = nv50_mstc_atomic_check,
+ .detect_ctx = nv50_mstc_detect,
+};
+
static void
nv50_mstc_destroy(struct drm_connector *connector)
{
@@ -1031,7 +1032,6 @@ nv50_mstc_destroy(struct drm_connector *connector)
static const struct drm_connector_funcs
nv50_mstc = {
.reset = nouveau_conn_reset,
- .detect = nv50_mstc_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = nv50_mstc_destroy,
.atomic_duplicate_state = nouveau_conn_atomic_duplicate_state,
diff --git a/drivers/gpu/drm/radeon/radeon_dp_mst.c b/drivers/gpu/drm/radeon/radeon_dp_mst.c
index 2994f07fbad92..ee28f5b3785e9 100644
--- a/drivers/gpu/drm/radeon/radeon_dp_mst.c
+++ b/drivers/gpu/drm/radeon/radeon_dp_mst.c
@@ -233,21 +233,26 @@ drm_encoder *radeon_mst_best_encoder(struct drm_connector *connector)
return &radeon_connector->mst_encoder->base;
}
+static int
+radeon_dp_mst_detect(struct drm_connector *connector,
+ struct drm_modeset_acquire_ctx *ctx,
+ bool force)
+{
+ struct radeon_connector *radeon_connector =
+ to_radeon_connector(connector);
+ struct radeon_connector *master = radeon_connector->mst_port;
+
+ return drm_dp_mst_detect_port(connector, ctx, &master->mst_mgr,
+ radeon_connector->port);
+}
+
static const struct drm_connector_helper_funcs radeon_dp_mst_connector_helper_funcs = {
.get_modes = radeon_dp_mst_get_modes,
.mode_valid = radeon_dp_mst_mode_valid,
.best_encoder = radeon_mst_best_encoder,
+ .detect_ctx = radeon_dp_mst_detect,
};
-static enum drm_connector_status
-radeon_dp_mst_detect(struct drm_connector *connector, bool force)
-{
- struct radeon_connector *radeon_connector = to_radeon_connector(connector);
- struct radeon_connector *master = radeon_connector->mst_port;
-
- return drm_dp_mst_detect_port(connector, &master->mst_mgr, radeon_connector->port);
-}
-
static void
radeon_dp_mst_connector_destroy(struct drm_connector *connector)
{
@@ -262,7 +267,6 @@ radeon_dp_mst_connector_destroy(struct drm_connector *connector)
static const struct drm_connector_funcs radeon_dp_mst_connector_funcs = {
.dpms = drm_helper_connector_dpms,
- .detect = radeon_dp_mst_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = radeon_dp_mst_connector_destroy,
};
diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h
index bccb5514e0ef1..fd142db42cb08 100644
--- a/include/drm/drm_dp_mst_helper.h
+++ b/include/drm/drm_dp_mst_helper.h
@@ -45,21 +45,31 @@ struct drm_dp_vcpi {
/**
* struct drm_dp_mst_port - MST port
* @port_num: port number
- * @input: if this port is an input port.
- * @mcs: message capability status - DP 1.2 spec.
- * @ddps: DisplayPort Device Plug Status - DP 1.2
- * @pdt: Peer Device Type
- * @ldps: Legacy Device Plug Status
- * @dpcd_rev: DPCD revision of device on this port
- * @num_sdp_streams: Number of simultaneous streams
- * @num_sdp_stream_sinks: Number of stream sinks
- * @available_pbn: Available bandwidth for this port.
+ * @input: if this port is an input port. Protected by
+ * &drm_dp_mst_topology_mgr.base.lock.
+ * @mcs: message capability status - DP 1.2 spec. Protected by
+ * &drm_dp_mst_topology_mgr.base.lock.
+ * @ddps: DisplayPort Device Plug Status - DP 1.2. Protected by
+ * &drm_dp_mst_topology_mgr.base.lock.
+ * @pdt: Peer Device Type. Protected by
+ * &drm_dp_mst_topology_mgr.base.lock.
+ * @ldps: Legacy Device Plug Status. Protected by
+ * &drm_dp_mst_topology_mgr.base.lock.
+ * @dpcd_rev: DPCD revision of device on this port. Protected by
+ * &drm_dp_mst_topology_mgr.base.lock.
+ * @num_sdp_streams: Number of simultaneous streams. Protected by
+ * &drm_dp_mst_topology_mgr.base.lock.
+ * @num_sdp_stream_sinks: Number of stream sinks. Protected by
+ * &drm_dp_mst_topology_mgr.base.lock.
+ * @available_pbn: Available bandwidth for this port. Protected by
+ * &drm_dp_mst_topology_mgr.base.lock.
* @next: link to next port on this branch device
* @aux: i2c aux transport to talk to device connected to this port, protected
- * by &drm_dp_mst_topology_mgr.lock
+ * by &drm_dp_mst_topology_mgr.base.lock.
* @parent: branch device parent of this port
* @vcpi: Virtual Channel Payload info for this port.
- * @connector: DRM connector this port is connected to.
+ * @connector: DRM connector this port is connected to. Protected by
+ * &drm_dp_mst_topology_mgr.base.lock.
* @mgr: topology manager this port lives under.
*
* This structure represents an MST port endpoint on a device somewhere
@@ -653,7 +663,11 @@ int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool ms
int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled);
-enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
+int
+drm_dp_mst_detect_port(struct drm_connector *connector,
+ struct drm_modeset_acquire_ctx *ctx,
+ struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_port *port);
bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr,
struct drm_dp_mst_port *port);