drm/amd/display: Add is_mst_connector debugfs entry

[Why & How]
Add "is_mst_connector" debugfs entry to help distinguish whether
a connector is in a mst topology or not.

Access it with the following command:
    cat /sys/kernel/debug/dri/0/DP-X/is_mst_connector

Result:
- "root" stands for the root connector of the topology
- "branch" stands for branch device of the topology
- "end" stands for leaf node connector of the topology
- "no" stands for the connector is not a device of a mst topology

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Hersen Wu <hersenxs.wu@amd.com>
Acked-by: Alan Liu <HaoPing.Liu@amd.com>
Signed-off-by: Wayne Lin <Wayne.Lin@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
index e0ea350784e3a67933765f91eb6fd0816bd53da8..4eecf052d08d1b7e2471cc8f677ee04e71cbfc4b 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
@@ -2540,6 +2540,57 @@ static int target_backlight_show(struct seq_file *m, void *unused)
        return 0;
 }
 
+/*
+ * function description: Determine if the connector is mst connector
+ *
+ * This function helps to determine whether a connector is a mst connector.
+ * - "root" stands for the root connector of the topology
+ * - "branch" stands for branch device of the topology
+ * - "end" stands for leaf node connector of the topology
+ * - "no" stands for the connector is not a device of a mst topology
+ * Access it with the following command:
+ *
+ *     cat /sys/kernel/debug/dri/0/DP-X/is_mst_connector
+ *
+ */
+static int dp_is_mst_connector_show(struct seq_file *m, void *unused)
+{
+       struct drm_connector *connector = m->private;
+       struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
+       struct drm_dp_mst_topology_mgr *mgr = NULL;
+       struct drm_dp_mst_port *port = NULL;
+       char *role = NULL;
+
+       mutex_lock(&aconnector->hpd_lock);
+
+       if (aconnector->mst_mgr.mst_state) {
+               role = "root";
+       } else if (aconnector->mst_port &&
+               aconnector->mst_port->mst_mgr.mst_state) {
+
+               role = "end";
+
+               mgr = &aconnector->mst_port->mst_mgr;
+               port = aconnector->port;
+
+               drm_modeset_lock(&mgr->base.lock, NULL);
+               if (port->pdt == DP_PEER_DEVICE_MST_BRANCHING &&
+                       port->mcs)
+                       role = "branch";
+               drm_modeset_unlock(&mgr->base.lock);
+
+       } else {
+               role = "no";
+       }
+
+       seq_printf(m, "%s\n", role);
+
+       mutex_unlock(&aconnector->hpd_lock);
+
+       return 0;
+}
+
+
 DEFINE_SHOW_ATTRIBUTE(dp_dsc_fec_support);
 DEFINE_SHOW_ATTRIBUTE(dmub_fw_state);
 DEFINE_SHOW_ATTRIBUTE(dmub_tracebuffer);
@@ -2549,6 +2600,7 @@ DEFINE_SHOW_ATTRIBUTE(hdcp_sink_capability);
 #endif
 DEFINE_SHOW_ATTRIBUTE(internal_display);
 DEFINE_SHOW_ATTRIBUTE(psr_capability);
+DEFINE_SHOW_ATTRIBUTE(dp_is_mst_connector);
 
 static const struct file_operations dp_dsc_clock_en_debugfs_fops = {
        .owner = THIS_MODULE,
@@ -2692,6 +2744,7 @@ static const struct {
                {"dp_dsc_fec_support", &dp_dsc_fec_support_fops},
                {"max_bpc", &dp_max_bpc_debugfs_fops},
                {"dsc_disable_passthrough", &dp_dsc_disable_passthrough_debugfs_fops},
+               {"is_mst_connector", &dp_is_mst_connector_fops}
 };
 
 #ifdef CONFIG_DRM_AMD_DC_HDCP