diff mbox series

[4.19,043/346] xhci: Give USB2 ports time to enter U3 in bus suspend

Message ID 20201228124921.872006343@linuxfoundation.org
State Superseded
Headers show
Series None | expand

Commit Message

Greg KH Dec. 28, 2020, 12:46 p.m. UTC 
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.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/host/xhci-hub.c |    4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -1617,6 +1617,10 @@  retry:
 	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;
 }