[PATCH 3/4] thunderbolt: Fix adapter init handling during switch add

Sanjay R Mehta
2021-08-02T12:58:55Z

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

Adapter0 (Port0) is the control adapter on the AMD USB4 host router.
As per USB4 spec in "Section 1.8", Control Adapters do not
have an Adapter Configuration Space".

The read requests on Adapter0 time's out and driver initialization fails.

Hence Disabling the Adapter in case of read-request timeout and continuing
the driver init.

Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
Signed-off-by: Sanjay R Mehta <sanju.mehta@amd.com>
---
drivers/thunderbolt/switch.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index 83b1ef3..effbfe4 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -2747,8 +2747,9 @@ int tb_switch_add(struct tb_switch *sw)
}
ret = tb_init_port(&sw->ports[i]);
if (ret) {
+ sw->ports[i].disabled = true;
dev_err(&sw->dev, "failed to initialize port %d\n", i);
- return ret;
+ continue;
}
}

--
2.7.4