usb: dwc2: gadget: Fix issue in dwc2_gadget_start_isoc()

-----Original Message-----
From: linux-usb-owner@vger.kernel.org
[mailto:linux-usb-owner@vger.kernel.org] On Behalf Of Minas Harutyunyan
Sent: Tuesday, June 12, 2018 4:37 PM
To: Felipe Balbi <balbi@kernel.org>; Greg Kroah-Hartman
[off-list ref]; Minas Harutyunyan
[off-list ref]; linux-usb@vger.kernel.org
Cc: John Youn <redacted>
Subject: [PATCH] usb: dwc2: gadget: Fix issue in dwc2_gadget_start_isoc()

In case of requests queue is empty reset EP target_frame to initial value.

This allow restarting ISOC traffic in case when function driver queued
requests with interruptions.

Signed-off-by: Minas Harutyunyan <hminas@synopsys.com>
---
drivers/usb/dwc2/gadget.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c index

7a5e265f48f7..24d23025be77 100644

--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c

@@ -891,6 +891,7 @@ static void dwc2_gadget_start_isoc_ddma(struct

dwc2_hsotg_ep *hs_ep)
	struct dwc2_dma_desc *desc;

	if (list_empty(&hs_ep->queue)) {
+		hs_ep->target_frame = TARGET_FRAME_INITIAL;
		dev_dbg(hsotg->dev, "%s: No requests in queue\n", __func__);
		return;
	}
--