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usb: dwc3: gadget: start requests as soon as they come

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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>
This commit is contained in:
Felipe Balbi 2015-09-14 11:27:46 -05:00
parent fe84f522ed
commit 1d6a39186b
1 changed files with 16 additions and 0 deletions
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16
drivers/usb/dwc3/gadget.c
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@ -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:
*