From 1d6a39186b37b6f5097f9cdee8fcbfc24d231428 Mon Sep 17 00:00:00 2001 From: Felipe Balbi Date: Mon, 14 Sep 2015 11:27:46 -0500 Subject: [PATCH] usb: dwc3: gadget: start requests as soon as they come 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 --- drivers/usb/dwc3/gadget.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 0429820152f9..2d0dc2d5c3c6 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -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: *