[PATCH 2/8] thunderbolt: Don't access path config space on Lane 1 adapters in tb_switch_reset_host()

[Mika Westerberg <mika.westerberg@linux.intel.com>]

From: Pooja Katiyar <pooja.katiyar@intel.com>

USB4 Lane 1 adapters do not have accessible path config space. Skip the
path config space cleanup in tb_switch_reset_host() for these ports. The
check is for USB4 switches only. Thunderbolt 1-3 Lane 1 adapters stay as
is because we do need to program their path config space.

Co-developed-by: Rene Sapiens <rene.sapiens@linux.intel.com>
Signed-off-by: Rene Sapiens <rene.sapiens@linux.intel.com>
Signed-off-by: Pooja Katiyar <pooja.katiyar@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
---
 drivers/thunderbolt/switch.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index bfcab98faf4b..ad0ec8f8ee28 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -1620,6 +1620,12 @@ static int tb_switch_reset_host(struct tb_switch *sw)
 				ret = tb_port_reset(port);
 				if (ret)
 					return ret;
+				/*
+				 * USB4 Lane 1 adapters do not have accessible
+				 * path config space.
+				 */
+				if (tb_switch_is_usb4(sw) && !port->usb4)
+					continue;
 			} else if (tb_port_is_usb3_down(port) ||
 				   tb_port_is_usb3_up(port)) {
 				tb_usb3_port_enable(port, false);
-- 
2.50.1