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usb: dwc3: gadget: fix OUT eps buffer size alignment issue

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Per dwc3 databook "Buffer Size Rules and Zero-Length Packets",
dwc3 needs buffer size to be aligned to MaxPacketSize on ep out.

Change-Id: Iff0e9c29c02c09b93bb34fed178051c02221ecc7
Signed-off-by: Wu Liang feng <wulf@rock-chips.com>
This commit is contained in:
Wu Liang feng
2016-06-06 11:30:35 +08:00
committed by Huang, Tao
parent f9f19c1066
commit bb6cd1d5aa
1 changed files with 12 additions and 1 deletions
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13
drivers/usb/dwc3/gadget.c
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@@ -1010,6 +1010,17 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
trace_dwc3_ep_queue(req);
/*
* Per databook, the total size of buffer must be a multiple
* of MaxPacketSize for OUT endpoints. And MaxPacketSize is
* configed for endpoints in dwc3_gadget_set_ep_config(),
* set to usb_endpoint_descriptor->wMaxPacketSize.
*/
if (dep->direction == 0 &&
req->request.length % dep->endpoint.desc->wMaxPacketSize)
req->request.length = roundup(req->request.length,
dep->endpoint.desc->wMaxPacketSize);
/*
* We only add to our list of requests now and
* start consuming the list once we get XferNotReady
@@ -1156,7 +1167,7 @@ static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request,
* any other request.
*/
if (ret == 0 && request->zero && request->length &&
(request->length % ep->maxpacket == 0))
(request->length % ep->desc->wMaxPacketSize == 0))
ret = __dwc3_gadget_ep_queue_zlp(dwc, dep);
spin_unlock_irqrestore(&dwc->lock, flags);