usb: dwc3: gadget: start transfer on XFER_COMPLETE

if by the time we get to XFER_COMPLETE we have
pending requests to be processed, instead of waiting
for a following XFER_NOT_READY, let's start the request
right away and, maybe, save the time of a few NAKs
due to lack of started transfers.

Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 201e1234244715d1c6f2e453a32773290be49956..c57e2002bcff5b1d0b101981fd8be45df0227ec4 100644 (file)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1967,6 +1967,14 @@ static void dwc3_endpoint_transfer_complete(struct dwc3 *dwc,
 
                dwc->u1u2 = 0;
        }
+
+       if (is_xfer_complete && !usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
+               int ret;
+
+               ret = __dwc3_gadget_kick_transfer(dep, 0, 1);
+               if (!ret || ret == -EBUSY)
+                       return;
+       }
 }
 
 static void dwc3_endpoint_interrupt(struct dwc3 *dwc,