usb: dwc3: gadget: Set maxpacket size for ep0 IN

[ Upstream commit 6180026341e852a250e1f97ebdcf71684a3c81b9 ]

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: Sasha Levin <alexander.levin@microsoft.com>

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index ff56aaa00bf73a743fffe9fbb4630183940612aa..3ce30909cbe4477d3988537f5aefd54347c4b570 100644 (file)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2376,6 +2376,8 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
                break;
        }
 
+       dwc->eps[1]->endpoint.maxpacket = dwc->gadget.ep0->maxpacket;
+
        /* Enable USB2 LPM Capability */
 
        if ((dwc->revision > DWC3_REVISION_194A)