Hi, On 1/8/2018 4:06 AM, Felipe Balbi wrote: > > Hi, > > Thinh Nguyen <thinh.ngu...@synopsys.com> writes: >> There are 2 control endpoint structures for DWC3. However, the driver >> only updates the OUT direction control endpoint structure during >> ConnectDone event. DWC3 driver needs to update the endpoint max packet >> size for control IN endpoint as well. If the max packet size is not >> properly set, then the driver will incorrectly calculate the data >> transfer size and fail to send ZLP for HS/FS 3-stage control read >> transfer. >> >> The fix is simply to update the max packet size for the ep0 IN direction >> during ConnectDone event. >> >> Signed-off-by: Thinh Nguyen <thi...@synopsys.com> >> --- >> drivers/usb/dwc3/gadget.c | 2 ++ >> 1 file changed, 2 insertions(+) >> >> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c >> index bdf2a2014ebd..6ae924d95cbc 100644 >> --- a/drivers/usb/dwc3/gadget.c >> +++ b/drivers/usb/dwc3/gadget.c >> @@ -2751,6 +2751,8 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 >> *dwc) >> break; >> } >> >> + dwc->eps[1]->endpoint.maxpacket = dwc->gadget.ep0->maxpacket; > > thanks :-) I've had that on my list for a while but never got to it > since it has no real effects other than reporting properly on > tracepoints :-) >
Just to clarify, this is a bug. We found this issue when we test for HS/FS 3-stage control read transfer for ZLP. BR, Thinh -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
