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Commit 2cd4cd54 authored by Nadine Toledano's avatar Nadine Toledano Committed by Gerrit - the friendly Code Review server
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usb: dwc3: gadget: Fix isochronous transfer for OUT endpoint 



Initialization of the TRBs for isoc. mode should take into
consideration that the last TRB is reserved as a link TRB.
As a result it should also initialize one less TRB.

Change-Id: Ib5a52585faf180b58c98a14b8430147280f39e0e
Signed-off-by: default avatarGilad Broner <gbroner@codeaurora.org>
Signed-off-by: default avatarBar Weiner <bweiner@codeaurora.org>
Signed-off-by: default avatarNadine Toledano <nadinet@codeaurora.org>
parent 648cfa62

drivers/usb/dwc3/gadget.c

+7 −19
Original line number Original line Diff line number Diff line
@@ -1038,25 +1038,13 @@ static void dwc3_prepare_trbs(struct dwc3_ep *dep, bool starting) 
	if (!trbs_left) {

	if (!trbs_left) {

		if (!starting)

		if (!starting)

			return;

			return;

		trbs_left = DWC3_TRB_NUM;

		/*

		 * In case we start from scratch, we queue the ISOC requests

		 * starting from slot 1. This is done because we use ring

		 * buffer and have no LST bit to stop us. Instead, we place

		 * IOC bit every TRB_NUM/4. We try to avoid having an interrupt

		 * after the first request so we start at slot 1 and have

		 * 7 requests proceed before we hit the first IOC.

		 * Other transfer types don't use the ring buffer and are

		 * processed from the first TRB until the last one. Since we

		 * don't wrap around we have to start at the beginning.

		 */

		if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {

			dep->busy_slot = 1;

			dep->free_slot = 1;

		} else {

		dep->busy_slot = 0;

		dep->busy_slot = 0;

		dep->free_slot = 0;

		dep->free_slot = 0;

		}

		/* For ISOC requests the last TRB is reserved for link TRB */

		if (usb_endpoint_xfer_isoc(dep->endpoint.desc))

			trbs_left = DWC3_TRB_NUM-1;

		else

			trbs_left = DWC3_TRB_NUM;

	}

	}





	list_for_each_entry_safe(req, n, &dep->request_list, list) {

	list_for_each_entry_safe(req, n, &dep->request_list, list) {