Commit 922f640c authored Jun 27, 2015 by Mayank Rana

dwc3: gadget: Avoid starting next transfer if transfer is active



XFERNOTREADY event provides status about current transfer. Hence
if transfer is active, then avoid starting next transfer by calling
__dwc3_gadget_kick_transfer() API. Otherwise USB controller stalls to
perform data transfer on that endpoint due to starting new transfer
without completing in progress transfer.

Change-Id: I90370e7e5de55b499a78fbfe5e913f39ec22c7e5
Signed-off-by: Mayank Rana <mrana@codeaurora.org>

parent 4c47f344

drivers/usb/dwc3/gadget.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -2602,6 +2602,14 @@ static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
		? "Transfer Active"
		: "Transfer Not Active");

		/*
		* If XFERNOTREADY interrupt is received with event
		* status as TRANSFER ACTIVE, don't kick next transfer.
		* otherwise data stall is seen on that endpoint.
		*/
		if (event->status & DEPEVT_STATUS_TRANSFER_ACTIVE)
		return;

		ret = __dwc3_gadget_kick_transfer(dep, 0, 1);
		if (!ret \|\| ret == -EBUSY)
		return;