tb_path_discover
struct tb_path *tb_path_discover(struct tb_port *src, int src_hopid,
path = tb_path_discover(in, TB_DP_VIDEO_HOPID, NULL, -1,
path = tb_path_discover(in, TB_DP_AUX_TX_HOPID, NULL, -1, NULL, "AUX TX",
path = tb_path_discover(tunnel->dst_port, -1, in, TB_DP_AUX_RX_HOPID,
path = tb_path_discover(down, TB_USB3_HOPID, NULL, -1,
path = tb_path_discover(tunnel->dst_port, -1, down, TB_USB3_HOPID, NULL,
path = tb_path_discover(down, TB_PCI_HOPID, NULL, -1,
path = tb_path_discover(tunnel->dst_port, -1, down, TB_PCI_HOPID, NULL,