diff options
| author | Felipe Balbi <balbi@ti.com> | 2015-09-14 16:27:46 (GMT) |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2015-09-27 15:54:31 (GMT) |
| commit | 1d6a39186b37b6f5097f9cdee8fcbfc24d231428 (patch) | |
| tree | f5b45a64eadecbdaa16979cbef121eb53b942718 /drivers/usb/dwc3 | |
| parent | fe84f522ed6d27ed0a48e202e04327c2f4891e23 (diff) | |
| download | linux-1d6a39186b37b6f5097f9cdee8fcbfc24d231428.tar.xz | |
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 <balbi@ti.com>
Diffstat (limited to 'drivers/usb/dwc3')
| -rw-r--r-- | drivers/usb/dwc3/gadget.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 0429820..2d0dc2d 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -1072,6 +1072,22 @@ 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: * * 1. XferNotReady with empty list of requests. We need to kick the |