mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-12 21:57:43 +00:00
Code Issues Releases Wiki Activity

xhci: Give USB2 ports time to enter U3 in bus suspend

Browse source 
commit c1373f1047 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>
This commit is contained in:
Li Jun 2020-12-08 11:29:12 +02:00 committed by Greg Kroah-Hartman
parent 6dcda2aaab
commit aded7e821a
1 changed files with 4 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
drivers/usb/host/xhci-hub.c
View file

@ -1590,6 +1590,10 @@ 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;
}