usb: dwc3: gadget: start requests as soon as they come (1d6a3918) · Commits · 戴 / test

In an attempt to make dwc3 slightly faster, let's start usb_requests as soon as they come as that will let us avoid a XFER_NOT_READY event and save a little bit of time. Signed-off-by:

Felipe Balbi <balbi@ti.com>

drivers/usb/dwc3/gadget.c

+16 −0

Original line number	Diff line number	Diff line
		@@ -1071,6 +1071,22 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep dep, struct dwc3_request req)

		list_add_tail(&req->list, &dep->request_list);

		/*
		* If there are no pending requests and the endpoint isn't already
		* busy, we will just start the request straight away.
		*
		* This will save one IRQ (XFER_NOT_READY) and possibly make it a
		* little bit faster.
		*/
		if (!usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
		!(dep->flags & DWC3_EP_BUSY)) {
		ret = __dwc3_gadget_kick_transfer(dep, 0, true);
		if (ret && ret != -EBUSY)
		dev_dbg(dwc->dev, "%s: failed to kick transfers\n",
		dep->name);
		return ret;
		}

		/*
		* There are a few special cases:
		*

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