These fields are marked as vendor defined in the USB4 spec and should
not be modified by the software, so only clear them when we are dealing
with pre-USB4 hardware.
Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Acked-by: Yehezkel Bernat <YehezkelShB@xxxxxxxxx>
---
drivers/thunderbolt/path.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/thunderbolt/path.c b/drivers/thunderbolt/path.c
index 03e7b714deab..7c2c45d9ba4a 100644
--- a/drivers/thunderbolt/path.c
+++ b/drivers/thunderbolt/path.c
@@ -406,10 +406,17 @@ static int __tb_path_deactivate_hop(struct tb_port *port, int hop_index,
if (!hop.pending) {
if (clear_fc) {
- /* Clear flow control */
- hop.ingress_fc = 0;
+ /*
+ * Clear flow control. Protocol adapters
+ * IFC and ISE bits are vendor defined
+ * in the USB4 spec so we clear them
+ * only for pre-USB4 adapters.
+ */
+ if (!tb_switch_is_usb4(port->sw)) {
+ hop.ingress_fc = 0;
+ hop.ingress_shared_buffer = 0;
+ }
hop.egress_fc = 0;
- hop.ingress_shared_buffer = 0;
hop.egress_shared_buffer = 0;
return tb_port_write(port, &hop, TB_CFG_HOPS,
--
2.28.0
