linux-kernel - [PATCH 4.9 14/83] usb: dwc3: gadget: set PCM1 field of isochronous-first TRBs

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Message-Id: <20170104200447.144802370@linuxfoundation.org>
Date:   Wed,  4 Jan 2017 21:06:06 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Felipe Balbi <felipe.balbi@...ux.intel.com>
Subject: [PATCH 4.9 14/83] usb: dwc3: gadget: set PCM1 field of isochronous-first TRBs

4.9-stable 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/dwc3/gadget.c |   13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -771,6 +771,9 @@ static void dwc3_prepare_one_trb(struct
 		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
 		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;