From b60e31bf18a7064032dbcb73dcb5b58f8a00a110 Mon Sep 17 00:00:00 2001

From: Sanjay R Mehta <sanju.mehta@amd.com>

Date: Thu, 4 Aug 2022 05:48:38 -0500

Subject: [PATCH] thunderbolt: Add DP OUT resource when DP tunnel is discovered

Git-commit: b60e31bf18a7064032dbcb73dcb5b58f8a00a110

Patch-mainline: v6.1-rc1

References: git-fixes

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>

Acked-by: Takashi Iwai <tiwai@suse.de>

---

 drivers/thunderbolt/tb.c | 28 ++++++++++++++++++++++++++++

 1 file changed, 28 insertions(+)

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.

-- 

2.35.3