linux-kernel - [PATCH 3.16 015/370] usb: dwc3: gadget: set PCM1 field of isochronous-first TRBs

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Date:   Fri, 10 Mar 2017 11:46:22 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Felipe Balbi" <felipe.balbi@...ux.intel.com>
Subject: [PATCH 3.16 015/370] usb: dwc3: gadget: set PCM1 field of
 isochronous-first TRBs

3.16.42-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Felipe Balbi <felipe.balbi@...ux.intel.com>

commit 6b9018d4c1e5c958625be94a160a5984351d4632 upstream.

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.

Signed-off-by: Felipe Balbi <felipe.balbi@...ux.intel.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -863,6 +863,8 @@ static void dwc3_prepare_one_trb(struct
 {
 	struct dwc3		*dwc = dep->dwc;
 	struct dwc3_trb		*trb;
+	struct usb_gadget	*gadget = &dwc->gadget;
+	enum usb_device_speed	speed = gadget->speed;
 
 	dev_vdbg(dwc->dev, "%s: req %p dma %08llx length %d%s%s\n",
 			dep->name, req, (unsigned long long) dma,
@@ -895,10 +897,16 @@ static void dwc3_prepare_one_trb(struct
 		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;
+		}
 		break;
 
 	case USB_ENDPOINT_XFER_BULK: