From: Felipe Balbi <felipe.balbi@linux.intel.com>
Date: Fri, 13 May 2016 07:19:42 +0000 (+0300)
Subject: UPSTREAM: usb: dwc3: gadget: return 0 if we try to Wakeup in superspeed
X-Git-Tag: firefly_0821_release~1833
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=7d57ec8050baac82a48e5b8c073d5a97a6729bf4;p=firefly-linux-kernel-4.4.55.git

UPSTREAM: usb: dwc3: gadget: return 0 if we try to Wakeup in superspeed

Instead of returning -EINVAL when someone calls
__dwc3_gadget_wakeup() in speeds > highspeed, let's
return 0. There are no problems for the driver for
calling it in superspeed as we cleanly just return.

This avoids an annoying WARN_ONCE() always
triggering during superspeed enumeration with LPM
enabled.

Change-Id: Iff35ee46a782684db1c2339ad71a73a303cb3a89
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Wu Liang feng <wulf@rock-chips.com>
(cherry picked from commit 6b74289937f624439c87135cfabb3deb2955fb53)
---

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index ad130fbd30f1..5be65bd6667a 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1441,7 +1441,7 @@ static int __dwc3_gadget_wakeup(struct dwc3 *dwc)
 	speed = reg & DWC3_DSTS_CONNECTSPD;
 	if (speed == DWC3_DSTS_SUPERSPEED) {
 		dwc3_trace(trace_dwc3_gadget, "no wakeup on SuperSpeed\n");
-		return -EINVAL;
+		return 0;
 	}
 
 	link_state = DWC3_DSTS_USBLNKST(reg);