thunderbolt: Set lane bonding bit only for downstream port

Fix the lane bonding procedure to follow the steps described in USB4 Connection Manager guide. Hence, set the lane bonding bit only for downstream port. This is needed for certain ASMedia device, otherwise lane bonding fails and the device disconnects. Cc: [email protected] Signed-off-by: Gil Fine <[email protected]> Signed-off-by: Mika Westerberg <[email protected]>
RoPieee · Nov 17, 2023 · 24d85bb · 24d85bb
1 parent b85ea95
commit 24d85bb
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
@@ -1143,7 +1143,7 @@ int tb_port_lane_bonding_enable(struct tb_port *port)
 	 * Only set bonding if the link was not already bonded. This
 	 * avoids the lane adapter to re-enter bonding state.
 	 */
-	if (width == TB_LINK_WIDTH_SINGLE) {
+	if (width == TB_LINK_WIDTH_SINGLE && !tb_is_upstream_port(port)) {
 		ret = tb_port_set_lane_bonding(port, true);
 		if (ret)
 			goto err_lane1;