[PATCH 3/4][SRU][Jammy/Unstable/OEM-5.17] thunderbolt: Do not make DROM read success compulsory

[You-Sheng Yang]

From: Mario Limonciello <mario.limonciello at amd.com>

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 at amd.com>
Signed-off-by: Mika Westerberg <mika.westerberg at linux.intel.com>
(cherry picked from commit 6915812bbd109787ebdb865561dc9164d4b01f56 linux-next)
Signed-off-by: You-Sheng Yang <vicamo.yang at 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 308f88fb6a30..fbe2617fde50 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -2731,10 +2731,8 @@ 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);
-- 
2.34.1