patch "usb: dwc3: fix Clear Stall EP command failure" added to usb-next

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 my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-next branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will also be merged in the next major kernel release during the merge window.

If you have any questions about this process, please let me know.

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

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(-)

index a5d496dd53b2..e49082f9edeb 100644
@@ -341,7 +341,8 @@ static int dwc3_send_clear_stall_ep_cmd(struct dwc3_ep *dep)
 	 * 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));

2.9.3