usb: dwc3: add a workaround for too small OUT requests

DWC3 hangs on OUT requests smaller than maxpacket size,
so HACK the request length to be at least equal to maxpacket size.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index de4d90859c5002d87047890cb6dbc4dddcde10eb..7c342c63ec67097cab6b77873df8d240bd08863b 100644 (file)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -974,6 +974,14 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
        req->direction          = dep->direction;
        req->epnum              = dep->number;
 
+       /*
+        * DWC3 hangs on OUT requests smaller than maxpacket size,
+        * so HACK the request length
+        */
+       if (dep->direction == 0 &&
+           req->request.length < dep->endpoint.maxpacket)
+               req->request.length = dep->endpoint.maxpacket;
+
        /*
         * We only add to our list of requests now and
         * start consuming the list once we get XferNotReady