From: David Francis <David.Francis@xxxxxxx>
DRM provides drm_dp_mst_dump_topology, which prints
useful information about MST devices
Hook this up to a debugfs file named amdgpu_mst_topology
Signed-off-by: David Francis <David.Francis@xxxxxxx>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@xxxxxxx>
---
.../amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 24 +++++++++++++++++++
1 file changed, 24 insertions(+)
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 406129e67e79..97bbb934cc04 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
@@ -1051,9 +1051,33 @@ static int target_backlight_read(struct seq_file *m, void *data)
return 0;
}
+static int mst_topo(struct seq_file *m, void *unused)
+{
+ struct drm_info_node *node = (struct drm_info_node *)m->private;
+ struct drm_device *dev = node->minor->dev;
+ struct drm_connector *connector;
+ struct drm_connector_list_iter conn_iter;
+ struct amdgpu_dm_connector *aconnector;
+
+ drm_connector_list_iter_begin(dev, &conn_iter);
+ drm_for_each_connector_iter(connector, &conn_iter) {
+ if (connector->connector_type != DRM_MODE_CONNECTOR_DisplayPort)
+ continue;
+
+ aconnector = to_amdgpu_dm_connector(connector);
+
+ seq_printf(m, "\nMST topology for connector %d\n", aconnector->connector_id);
+ drm_dp_mst_dump_topology(m, &aconnector->mst_mgr);
+ }
+ drm_connector_list_iter_end(&conn_iter);
+
+ return 0;
+}
+
static const struct drm_info_list amdgpu_dm_debugfs_list[] = {
{"amdgpu_current_backlight_pwm", ¤t_backlight_read},
{"amdgpu_target_backlight_pwm", &target_backlight_read},
+ {"amdgpu_mst_topology", &mst_topo},
};
/*
--
2.17.1
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