If any software has interacted with the USB4 registers before the Linux USB4 CM runs, it may have modified the plug events delay. It has been observed that if this value too large, it's possible that hotplugged devices will negotiate a fallback mode instead in Linux. To prevent this, explicitly align the plug events delay with the USB4 spec value of 10ms. Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx> --- drivers/thunderbolt/switch.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c index c63c1f4ff9dc..77d7f07ca075 100644 --- a/drivers/thunderbolt/switch.c +++ b/drivers/thunderbolt/switch.c @@ -2413,6 +2413,7 @@ int tb_switch_configure(struct tb_switch *sw) * additional capabilities. */ sw->config.cmuv = USB4_VERSION_1_0; + sw->config.plug_events_delay = 0xa; /* Enumerate the switch */ ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH, -- 2.34.1
