[SRU][OEM-5.17][PATCH 2/2] UBUNTU: SAUCE: thunderbolt: Add DP out resource when DP tunnel is discovered.
Mario Limonciello
mario.limonciello at amd.com
Thu Aug 4 14:04:19 UTC 2022
From: Sanjay R Mehta <sanju.mehta at amd.com>
BugLink: https://bugs.launchpad.net/bugs/1983143
If the boot firmware implements a connection manager of its
own it may create a DP tunnel and will be handed off to Linux
CM, 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 at amd.com>
Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar at amd.com>
(cherry-picked from https://lore.kernel.org/linux-usb/1659610118-119104-1-git-send-email-Sanju.Mehta@amd.com/T/#u)
Signed-off-by: Mario Limonciello <mario.limonciello at amd.com>
---
drivers/thunderbolt/tb.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
index a1f5d1842811..ba45938bf080 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)
@@ -1409,6 +1435,8 @@ 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.
--
2.34.1
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