From 0ce52d73e52898ea811f604ebfeef283b51aabd8 Mon Sep 17 00:00:00 2001
From: Mario Limonciello <mario.limonciello@amd.com>
Date: Thu, 3 Mar 2022 07:13:26 -0600
Subject: [PATCH] thunderbolt: Do not make DROM read success compulsory
BugLink: https://bugs.launchpad.net/bugs/1962349
The USB4 specification doesn't make any requirements that reading
a device router's DROM is needed for the operation of the device.
Other connection manager solutions don't necessarily read it or gate
the usability of the device on whether it was read.
So make failures when reading the DROM show warnings but not
fail the initialization of the router.
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
(cherry picked from commit 6915812bbd109787ebdb865561dc9164d4b01f56 linux-next)
Signed-off-by: You-Sheng Yang <vicamo.yang@canonical.com>
Signed-off-by: Timo Aaltonen <timo.aaltonen@canonical.com>
---
drivers/thunderbolt/switch.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index 23af952456d20..00a332654fbb1 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -2724,10 +2724,8 @@ int tb_switch_add(struct tb_switch *sw)
/* read drom */
ret = tb_drom_read(sw);
- if (ret) {
- dev_err(&sw->dev, "reading DROM failed\n");
- return ret;
- }
+ if (ret)
+ dev_warn(&sw->dev, "reading DROM failed: %d\n", ret);
tb_sw_dbg(sw, "uid: %#llx\n", sw->uid);
tb_check_quirks(sw);