[PATCH 1/5] thunderbolt: Silently ignore CLx enabling in case CLx is not supported

[Gil Fine <gil.fine@intel.com>]

We can't enable CLx if it is not supported either by the host or device,
or by the USB4/TBT link (e.g. when an optical cable is used).
We silently ignore CLx enabling in this case.

Signed-off-by: Gil Fine <gil.fine@intel.com>
---
 drivers/thunderbolt/tb.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
index 44d04b651a8b..7419cd1aefba 100644
--- a/drivers/thunderbolt/tb.c
+++ b/drivers/thunderbolt/tb.c
@@ -581,6 +581,7 @@ static void tb_scan_port(struct tb_port *port)
 	struct tb_cm *tcm = tb_priv(port->sw->tb);
 	struct tb_port *upstream_port;
 	struct tb_switch *sw;
+	int ret;
 
 	if (tb_is_upstream_port(port))
 		return;
@@ -669,7 +670,9 @@ static void tb_scan_port(struct tb_port *port)
 	tb_switch_lane_bonding_enable(sw);
 	/* Set the link configured */
 	tb_switch_configure_link(sw);
-	if (tb_switch_enable_clx(sw, TB_CL0S))
+	/* Silently ignore CLx enabling in case CLx is not supported */
+	ret = tb_switch_enable_clx(sw, TB_CL0S);
+	if (ret && ret != -EOPNOTSUPP)
 		tb_sw_warn(sw, "failed to enable CLx on upstream port\n");
 
 	tb_switch_tmu_configure(sw, TB_SWITCH_TMU_RATE_HIFI,
@@ -1452,12 +1455,15 @@ static int tb_suspend_noirq(struct tb *tb)
 static void tb_restore_children(struct tb_switch *sw)
 {
 	struct tb_port *port;
+	int ret;
 
 	/* No need to restore if the router is already unplugged */
 	if (sw->is_unplugged)
 		return;
 
-	if (tb_switch_enable_clx(sw, TB_CL0S))
+	/* Silently ignore CLx re-enabling in case CLx is not supported */
+	ret = tb_switch_enable_clx(sw, TB_CL0S);
+	if (ret && ret != -EOPNOTSUPP)
 		tb_sw_warn(sw, "failed to re-enable CLx on upstream port\n");
 
 	/*
-- 
2.17.1

---------------------------------------------------------------------
Intel Israel (74) Limited

This e-mail and any attachments may contain confidential material for
the sole use of the intended recipient(s). Any review or distribution
by others is strictly prohibited. If you are not the intended
recipient, please contact the sender and delete all copies.