[PATCH 13/21] drm/amd/display: Fix MST topology debugfs

[Anson Jacob]

From: Eryk Brol <eryk.brol at amd.com>

[why]
The drm dump_topology function was previously called on all
DP connectors. This resulted in empty topology dumps for those
connectors which weren't root MST nodes.

[how]
Make sure we only dump topology from the root MST node.

Signed-off-by: Eryk Brol <eryk.brol at amd.com>
Reviewed-by: Aurabindo Jayamohanan Pillai <Aurabindo.Pillai at amd.com>
Acked-by: Anson Jacob <Anson.Jacob at amd.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 4 ++++
 1 file changed, 4 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 f6f10a8c3e43..5a9809e33af8 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
@@ -2901,6 +2901,10 @@ static int mst_topo_show(struct seq_file *m, void *unused)
 
 		aconnector = to_amdgpu_dm_connector(connector);
 
+		/* Ensure we're only dumping the topology of a root mst node */
+		if (!aconnector->mst_mgr.mst_state)
+			continue;
+
 		seq_printf(m, "\nMST topology for connector %d\n", aconnector->connector_id);
 		drm_dp_mst_dump_topology(m, &aconnector->mst_mgr);
 	}
-- 
2.25.1