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

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
commands.

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

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index e24a01cc98df4a43f2fd556e44b1557dce778d33..a58376fd65fe6d788fa817d5600696bfd431c791 100644 (file)
--- 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;