[PATCH 2/2] xhci: Improve the XHCI resume time

[Basavaraj Natikar <Basavaraj.Natikar@amd.com>]

xHC system resume time may increase due to a 120ms delay. A PME# signal
will trigger the xHC host to resume runtime, and the host must wait for a
missed U3 LFPS wake signal before re-checking for port activity. It may
be necessary to wait only for auto-resume cases. Add a check only for
runtime resume to avoid the delay for other PM events so that the resume
time can be improved.

Fixes: 253f588c70f6 ("xhci: Improve detection of device initiated wake signal.")
Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
---
 drivers/usb/host/xhci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index a539e4dd54f7..a3ee80ee5d1e 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -1315,7 +1315,7 @@ int xhci_resume(struct xhci_hcd *xhci, int event)
 		 * the first wake signalling failed, give it that chance.
 		 */
 		pending_portevent = xhci_pending_portevent(xhci);
-		if (!pending_portevent) {
+		if (!pending_portevent && event == PM_EVENT_AUTO_RESUME) {
 			msleep(120);
 			pending_portevent = xhci_pending_portevent(xhci);
 		}
-- 
2.25.1