xhci: Improve detection of device initiated wake signal.

commit 253f588c70f66184b1f3a9bbb428b49bbda73e80 upstream.

A xHC USB 3 port might miss the first wake signal from a USB 3 device
if the port LFPS reveiver isn't enabled fast enough after xHC resume.

xHC host will anyway be resumed by a PME# signal, but will go back to
suspend if no port activity is seen.
The device resends the U3 LFPS wake signal after a 100ms delay, but
by then host is already suspended, starting all over from the
beginning of this issue.

USB 3 specs say U3 wake LFPS signal is sent for max 10ms, then device
needs to delay 100ms before resending the wake.

Don't suspend immediately if port activity isn't detected in resume.
Instead add a retry. If there is no port activity then delay for 120ms,
and re-check for port activity.

Cc: <stable@vger.kernel.org>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20210311115353.2137560-3-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index e7dee8e3ca8b1a67e4fa6f9e64a2756fe1a8aaf5..bd6e3555c04793c51192f0d7323ba5c54a962a74 100644 (file)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -1018,6 +1018,7 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
        struct usb_hcd          *secondary_hcd;
        int                     retval = 0;
        bool                    comp_timer_running = false;
+       bool                    pending_portevent = false;
 
        if (!hcd->state)
                return 0;
@@ -1151,13 +1152,22 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
 
  done:
        if (retval == 0) {
-               /* Resume root hubs only when have pending events. */
-               if (xhci_pending_portevent(xhci)) {
+               /*
+                * Resume roothubs only if there are pending events.
+                * USB 3 devices resend U3 LFPS wake after a 100ms delay if
+                * the first wake signalling failed, give it that chance.
+                */
+               pending_portevent = xhci_pending_portevent(xhci);
+               if (!pending_portevent) {
+                       msleep(120);
+                       pending_portevent = xhci_pending_portevent(xhci);
+               }
+
+               if (pending_portevent) {
                        usb_hcd_resume_root_hub(xhci->shared_hcd);
                        usb_hcd_resume_root_hub(hcd);
                }
        }
-
        /*
         * If system is subject to the Quirk, Compliance Mode Timer needs to
         * be re-initialized Always after a system resume. Ports are subject