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Commit 6b9018d4 authored by Felipe Balbi's avatar Felipe Balbi
Browse files

usb: dwc3: gadget: set PCM1 field of isochronous-first TRBs 



In case of High-Speed, High-Bandwidth endpoints, we
need to tell DWC3 that we have more than one packet
per interval. We do that by setting PCM1 field of
Isochronous-First TRB.

Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarFelipe Balbi <felipe.balbi@linux.intel.com>
parent eaa496ff

drivers/usb/dwc3/gadget.c

+11 −2
Original line number Diff line number Diff line
@@ -771,6 +771,9 @@ static void dwc3_prepare_one_trb(struct dwc3_ep *dep, 
		unsigned length, unsigned chain, unsigned node)

{

	struct dwc3_trb		*trb;

	struct dwc3		*dwc = dep->dwc;

	struct usb_gadget	*gadget = &dwc->gadget;

	enum usb_device_speed	speed = gadget->speed;



	dwc3_trace(trace_dwc3_gadget, "%s: req %p dma %08llx length %d%s",

			dep->name, req, (unsigned long long) dma,
@@ -798,10 +801,16 @@ static void dwc3_prepare_one_trb(struct dwc3_ep *dep, 
		break;



	case USB_ENDPOINT_XFER_ISOC:

		if (!node)

		if (!node) {

			trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS_FIRST;

		else



			if (speed == USB_SPEED_HIGH) {

				struct usb_ep *ep = &dep->endpoint;

				trb->size |= DWC3_TRB_SIZE_PCM1(ep->mult - 1);

			}

		} else {

			trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS;

		}



		/* always enable Interrupt on Missed ISOC */

		trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;