drm/amd/display: Fix debugfs on MST connectors

[why]
Previous patch allowed to initialize debugfs entries on both MST
and SST connectors, but MST connectors get registered much later
which exposed an issue of debugfs entries being initialized in the
same folder.

[how]
Return SST debugfs entries' initialization back to where it was.
For MST connectors we should initialize debugfs entries in connector
register function after the connector is registered.
Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -5584,12 +5584,6 @@ void amdgpu_dm_connector_init_helper(struct amdgpu_display_manager *dm,
 			drm_connector_attach_content_protection_property(&aconnector->base, false);
 #endif
 	}
-
-#if defined(CONFIG_DEBUG_FS)
-	connector_debugfs_init(aconnector);
-	aconnector->debugfs_dpcd_address = 0;
-	aconnector->debugfs_dpcd_size = 0;
-#endif
 }
 
 static int amdgpu_dm_i2c_xfer(struct i2c_adapter *i2c_adap,
@@ -5712,8 +5706,6 @@ static int amdgpu_dm_connector_init(struct amdgpu_display_manager *dm,
 			&aconnector->base,
 			&amdgpu_dm_connector_helper_funcs);
 
-	drm_connector_register(&aconnector->base);
-
 	amdgpu_dm_connector_init_helper(
 		dm,
 		aconnector,
@@ -5724,6 +5716,13 @@ static int amdgpu_dm_connector_init(struct amdgpu_display_manager *dm,
 	drm_connector_attach_encoder(
 		&aconnector->base, &aencoder->base);
 
+	drm_connector_register(&aconnector->base);
+#if defined(CONFIG_DEBUG_FS)
+	connector_debugfs_init(aconnector);
+	aconnector->debugfs_dpcd_address = 0;
+	aconnector->debugfs_dpcd_size = 0;
+#endif
+
 	if (connector_type == DRM_MODE_CONNECTOR_DisplayPort
 		|| connector_type == DRM_MODE_CONNECTOR_eDP)
 		amdgpu_dm_initialize_dp_connector(dm, aconnector);

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c

@@ -36,7 +36,9 @@
 #include "dc_link_ddc.h"
 
 #include "i2caux_interface.h"
-
+#if defined(CONFIG_DEBUG_FS)
+#include "amdgpu_dm_debugfs.h"
+#endif
 /* #define TRACE_DPCD */
 
 #ifdef TRACE_DPCD
@@ -147,6 +149,12 @@ amdgpu_dm_mst_connector_late_register(struct drm_connector *connector)
 		to_amdgpu_dm_connector(connector);
 	struct drm_dp_mst_port *port = amdgpu_dm_connector->port;
 
+#if defined(CONFIG_DEBUG_FS)
+	connector_debugfs_init(amdgpu_dm_connector);
+	amdgpu_dm_connector->debugfs_dpcd_address = 0;
+	amdgpu_dm_connector->debugfs_dpcd_size = 0;
+#endif
+
 	return drm_dp_mst_connector_late_register(connector, port);
 }