usb: dwc3: gadget: don't prestart interrupt endpoints

Message ID
State Accepted
Commit 62e345ae5b6ed977b02c24d1eaeaece062f9fb17
Headers show

Commit Message

Felipe Balbi Nov. 30, 2015, 9:35 p.m.
Because interrupt endpoints usually transmit such
small amounts of data, it seems pointless to prestart
transfers and try to get speed improvements. This
patch also sorts out a problem with CDC ECM function
where its notification endpoint gets stuck in busy
state and we continuously issue Update Transfer

Fixes: 8a1a9c9e4503 ("usb: dwc3: gadget: start transfer on XFER_COMPLETE")
Signed-off-by: Felipe Balbi <>

 drivers/usb/dwc3/gadget.c | 1 +
 1 file changed, 1 insertion(+)


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diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 55ba447fdf8b..e5bb60242ffa 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1078,6 +1078,7 @@  static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
 	 * little bit faster.
 	if (!usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
+			!usb_endpoint_xfer_int(dep->endpoint.desc) &&
 			!(dep->flags & DWC3_EP_BUSY)) {
 		ret = __dwc3_gadget_kick_transfer(dep, 0, true);
 		goto out;