From: Sanjay R Mehta <sanju.mehta@xxxxxxx>
commit b60e31bf18a7064032dbcb73dcb5b58f8a00a110 upstream.
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 <sanju.mehta@xxxxxxx>
Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@xxxxxxx>
Tested-by: Renjith Pananchikkal <Renjith.Pananchikkal@xxxxxxx>
Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Cc: "Limonciello, Mario" <Mario.Limonciello@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/thunderbolt/tb.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
--- a/drivers/thunderbolt/tb.c
+++ b/drivers/thunderbolt/tb.c
@@ -105,6 +105,32 @@ static void tb_remove_dp_resources(struc
}
}
+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.
