Patch "usb: dwc3: fix Clear Stall EP command failure" has been added to the 4.8-stable tree

This is a note to let you know that I've just added the patch titled

usb: dwc3: fix Clear Stall EP command failure

to the 4.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
usb-dwc3-fix-clear-stall-ep-command-failure.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Lu Baolu <[email protected]>
Date: Fri, 9 Sep 2016 12:51:27 +0800
Subject: usb: dwc3: fix Clear Stall EP command failure

From: Lu Baolu <[email protected]>

commit 5e6c88d28ccbe72bedee1fbf4f9fea4764208598 upstream.

Commit 50c763f8c1bac ("usb: dwc3: Set the ClearPendIN bit on Clear Stall EP command") sets ClearPendIN bit for all IN endpoints of v2.60a+ cores. This causes ClearStall command fails on 2.60+ cores operating in HighSpeed mode.

In page 539 of 2.60a specification:

"When issuing Clear Stall command for IN endpoints in SuperSpeed mode, the software must set the "ClearPendIN" bit to '1' to clear any pending IN transcations, so that the device does not expect any ACK TP from the host for the data sent earlier."

It's obvious that we only need to apply this rule to those IN endpoints that currently operating in SuperSpeed mode.

---
 drivers/usb/dwc3/gadget.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

@@ -348,7 +348,8 @@ static int dwc3_send_clear_stall_ep_cmd(
 	 * IN transfers due to a mishandled error condition. Synopsys
 	 * STAR 9000614252.
 	 */
-	if (dep->direction && (dwc->revision >= DWC3_REVISION_260A))
+	if (dep->direction && (dwc->revision >= DWC3_REVISION_260A) &&
+	    (dwc->gadget.speed >= USB_SPEED_SUPER))
 		cmd |= DWC3_DEPCMD_CLEARPENDIN;
 
 	memset(&params, 0, sizeof(params));

Patches currently in stable-queue which might be from [email protected] are

queue-4.8/usb-dwc3-fix-clear-stall-ep-command-failure.patch queue-4.8/mfd-rtsx_usb-avoid-setting-ucr-current_sg.status.patch