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thunderbolt: Do not clear USB4 router protocol adapter IFC and ISE bits

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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@linux.intel.com>
Acked-by: Yehezkel Bernat <YehezkelShB@gmail.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mika Westerberg 2020-10-07 17:08:47 +03:00
parent f8394f232b
commit 81816f5048
1 changed files with 10 additions and 3 deletions
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13
drivers/thunderbolt/path.c
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@ -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,