4.9-stable review patch. If anyone has any objections, please let me know.
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From: Thinh Nguyen Thinh.Nguyen@synopsys.com
commit 6180026341e852a250e1f97ebdcf71684a3c81b9 upstream.
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.
Cc: stable@vger.kernel.org Fixes: 72246da40f37 ("usb: Introduce DesignWare USB3 DRD Driver") Signed-off-by: Thinh Nguyen thinhn@synopsys.com Signed-off-by: Felipe Balbi felipe.balbi@linux.intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/usb/dwc3/gadget.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -2528,6 +2528,8 @@ static void dwc3_gadget_conndone_interru break; }
+ dwc->eps[1]->endpoint.maxpacket = dwc->gadget.ep0->maxpacket; + /* Enable USB2 LPM Capability */
if ((dwc->revision > DWC3_REVISION_194A) &&