thunderbolt: Silently ignore CLx enabling in case CLx is not supported

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>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
index 9a3214f..8ab3530 100644 (file)
--- a/drivers/thunderbolt/tb.c
+++ b/drivers/thunderbolt/tb.c
@@ -575,6 +575,7 @@ 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;
@@ -663,7 +664,9 @@ 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,
@@ -1446,12 +1449,15 @@ 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");
 
        /*