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thunderbolt: Explicitly reset plug events delay back to USB4 spec value

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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.

Cc: stable@vger.kernel.org
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Mario Limonciello 2022-09-21 09:54:32 -05:00 committed by Mika Westerberg
parent 521a547ced
commit 31f87f705b
1 changed files with 1 additions and 0 deletions
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1
drivers/thunderbolt/switch.c
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@ -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,