Hi Anton,
On Wed, Dec 18, 2013 at 12:11:33PM +0800, Felipe Balbi wrote:
> Hi,
>
> On Tue, Dec 17, 2013 at 03:59:31PM +0900, Anton Tikhomirov wrote:
> > In accordance with specification, when sent data length is
>
> please mention section of specification.
>
> > an exact multiple of wMaxPacketSize for the pipe and less
> > than requested by host, the function shall return a zero-length
> > packet (ZLP) to indicate the end of the Data stage to a USB host.
>
> hmm... so in USB3 mode that would be host requesting 513 bytes and us
> sending only 512.
Curious, what was the use case when you encountered above situation?
Wouldn't something simple as follows be able to resolve it?
diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
index 95f7649..8b419aa 100644
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -924,6 +924,10 @@ static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
ret = dwc3_ep0_start_trans(dwc, dep->number, req->request.dma,
req->request.length, DWC3_TRBCTL_CONTROL_DATA);
+ if (req->zero && !ret)
+ ret = dwc3_ep0_start_trans(dwc, dep->number,
+ dwc->ctrl_req_addr, 0,
+ DWC3_TRBCTL_CONTROL_DATA);
}
WARN_ON(ret < 0);
Regards
Pratyush
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