From: Li Jun jun.li@nxp.com
commit c1373f10479b624fb6dba0805d673e860f1b421d upstream.
If a USB2 device wakeup is not enabled/supported the link state may still be in U0 in xhci_bus_suspend(), where it's then manually put to suspended U3 state.
Just as with selective suspend the device needs time to enter U3 suspend before continuing with further suspend operations (e.g. system suspend), otherwise we may enter system suspend with link state in U0.
[commit message rewording -Mathias]
Cc: stable@vger.kernel.org Signed-off-by: Li Jun jun.li@nxp.com Signed-off-by: Mathias Nyman mathias.nyman@linux.intel.com Link: https://lore.kernel.org/r/20201208092912.1773650-6-mathias.nyman@linux.intel... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/usb/host/xhci-hub.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/drivers/usb/host/xhci-hub.c +++ b/drivers/usb/host/xhci-hub.c @@ -1400,6 +1400,10 @@ int xhci_bus_suspend(struct usb_hcd *hcd hcd->state = HC_STATE_SUSPENDED; bus_state->next_statechange = jiffies + msecs_to_jiffies(10); spin_unlock_irqrestore(&xhci->lock, flags); + + if (bus_state->bus_suspended) + usleep_range(5000, 10000); + return 0; }