thunderbolt: Add DP OUT resource when DP tunnel is discovered

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@amd.com>
Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
Tested-by: Renjith Pananchikkal <Renjith.Pananchikkal@amd.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: "Limonciello, Mario" <Mario.Limonciello@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
index ea77b43..0c3e1d1 100644 (file)
--- 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)
@@ -1396,6 +1422,8 @@ 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.