From b60e31bf18a7064032dbcb73dcb5b58f8a00a110 Mon Sep 17 00:00:00 2001 From: Sanjay R Mehta Date: Thu, 4 Aug 2022 05:48:38 -0500 Subject: thunderbolt: Add DP OUT resource when DP tunnel is discovered If the boot firmware implements a connection manager of its own it may create a DisplayPort tunnel and will be handed off to Linux connection manager, but the DP OUT resource is not saved in the dp_resource list. This patch adds tunnelled DP OUT port to the dp_resource list once the DP tunnel is discovered. Signed-off-by: Sanjay R Mehta Signed-off-by: Basavaraj Natikar Tested-by: Renjith Pananchikkal Signed-off-by: Mika Westerberg --- drivers/thunderbolt/tb.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) (limited to 'drivers/thunderbolt') diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c index 9853f6c7e81d..583c22df4040 100644 --- a/drivers/thunderbolt/tb.c +++ b/drivers/thunderbolt/tb.c @@ -105,6 +105,32 @@ static void tb_remove_dp_resources(struct tb_switch *sw) } } +static void tb_discover_dp_resource(struct tb *tb, struct tb_port *port) +{ + struct tb_cm *tcm = tb_priv(tb); + struct tb_port *p; + + list_for_each_entry(p, &tcm->dp_resources, list) { + if (p == port) + return; + } + + tb_port_dbg(port, "DP %s resource available discovered\n", + tb_port_is_dpin(port) ? "IN" : "OUT"); + list_add_tail(&port->list, &tcm->dp_resources); +} + +static void tb_discover_dp_resources(struct tb *tb) +{ + struct tb_cm *tcm = tb_priv(tb); + struct tb_tunnel *tunnel; + + list_for_each_entry(tunnel, &tcm->tunnel_list, list) { + if (tb_tunnel_is_dp(tunnel)) + tb_discover_dp_resource(tb, tunnel->dst_port); + } +} + static void tb_switch_discover_tunnels(struct tb_switch *sw, struct list_head *list, bool alloc_hopids) @@ -1446,6 +1472,8 @@ static int tb_start(struct tb *tb) tb_scan_switch(tb->root_switch); /* Find out tunnels created by the boot firmware */ tb_discover_tunnels(tb); + /* Add DP resources from the DP tunnels created by the boot firmware */ + tb_discover_dp_resources(tb); /* * If the boot firmware did not create USB 3.x tunnels create them * now for the whole topology. -- cgit v1.2.3