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

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>

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index f483c3b1e971e1d37b762c57b74b7a9850f82dd5..26efe8c7535f50e39fb08b157c201255c2f20980 100644 (file)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2528,6 +2528,8 @@ 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) &&