usb: dwc3: gadget: fix pending isoc handling (f4a53c55) · Commits · 戴 / test

If xfernotready is received and there is no request in request_list then REQUEST_PENDING flag must be set, so that next request in ep queue is executed. In case of isoc transfer, if xfernotready is already elapsed and even first request has not been queued to request_list, then issue END TRANSFER, so that you can receive xfernotready again and can have notion of current microframe. Signed-off-by:

Pratyush Anand <pratyush.anand@st.com> Signed-off-by:

Felipe Balbi <balbi@ti.com>

drivers/usb/dwc3/gadget.c

+12 −0

Original line number	Diff line number	Diff line
		@@ -1029,6 +1029,7 @@ static void __dwc3_gadget_start_isoc(struct dwc3 *dwc,
		if (list_empty(&dep->request_list)) {
		dev_vdbg(dwc->dev, "ISOC ep %s run out for requests.\n",
		dep->name);
		dep->flags \|= DWC3_EP_PENDING_REQUEST;
		return;
		}

		@@ -1092,6 +1093,17 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep dep, struct dwc3_request req)
		if (dep->flags & DWC3_EP_PENDING_REQUEST) {
		int ret;

		/*
		* If xfernotready is already elapsed and it is a case
		* of isoc transfer, then issue END TRANSFER, so that
		* you can receive xfernotready again and can have
		* notion of current microframe.
		*/
		if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
		dwc3_stop_active_transfer(dwc, dep->number);
		return 0;
		}

		ret = __dwc3_gadget_kick_transfer(dep, 0, true);
		if (ret && ret != -EBUSY) {
		struct dwc3 *dwc = dep->dwc;

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