---

yaml
---
r: 265131
b: refs/heads/master
c: 48e8236
h: refs/heads/master
i:
  265129: f51d581
  265127: c67ef70
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: fa3ae0c158c70e6cf227b3a194659ee7fed8c588
+refs/heads/master: 48e8236114c12c5366e032fc517e1bd376369a56

trunk/drivers/usb/core/hcd.c

@@ -442,7 +442,11 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
 	struct usb_ctrlrequest *cmd;
  	u16		typeReq, wValue, wIndex, wLength;
 	u8		*ubuf = urb->transfer_buffer;
-	u8		tbuf [sizeof (struct usb_hub_descriptor)]
+	/*
+	 * tbuf should be as big as the BOS descriptor and
+	 * the USB hub descriptor.
+	 */
+	u8		tbuf[USB_DT_BOS_SIZE + USB_DT_USB_SS_CAP_SIZE]
 		__attribute__((aligned(4)));
 	const u8	*bufp = tbuf;
 	unsigned	len = 0;
@@ -562,6 +566,8 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
 			else /* unsupported IDs --> "protocol stall" */
 				goto error;
 			break;
+		case USB_DT_BOS << 8:
+			goto nongeneric;
 		default:
 			goto error;
 		}
@@ -596,6 +602,7 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
 	/* CLASS REQUESTS (and errors) */
 
 	default:
+nongeneric:
 		/* non-generic request */
 		switch (typeReq) {
 		case GetHubStatus:
@@ -605,6 +612,9 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
 		case GetHubDescriptor:
 			len = sizeof (struct usb_hub_descriptor);
 			break;
+		case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
+			/* len is returned by hub_control */
+			break;
 		}
 		status = hcd->driver->hub_control (hcd,
 			typeReq, wValue, wIndex,
@@ -615,7 +625,7 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
 		status = -EPIPE;
 	}
 
-	if (status) {
+	if (status < 0) {
 		len = 0;
 		if (status != -EPIPE) {
 			dev_dbg (hcd->self.controller,
@@ -624,6 +634,10 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
 				typeReq, wValue, wIndex,
 				wLength, status);
 		}
+	} else if (status > 0) {
+		/* hub_control may return the length of data copied. */
+		len = status;
+		status = 0;
 	}
 	if (len) {
 		if (urb->transfer_buffer_length < len)

trunk/drivers/usb/host/xhci-hub.c

@@ -28,6 +28,25 @@
 #define	PORT_RWC_BITS	(PORT_CSC | PORT_PEC | PORT_WRC | PORT_OCC | \
 			 PORT_RC | PORT_PLC | PORT_PE)
 
+/* usb 1.1 root hub device descriptor */
+static u8 usb_bos_descriptor [] = {
+	USB_DT_BOS_SIZE,		/*  __u8 bLength, 5 bytes */
+	USB_DT_BOS,			/*  __u8 bDescriptorType */
+	0x0F, 0x00,			/*  __le16 wTotalLength, 15 bytes */
+	0x1,				/*  __u8 bNumDeviceCaps */
+	/* First device capability */
+	USB_DT_USB_SS_CAP_SIZE,		/*  __u8 bLength, 10 bytes */
+	USB_DT_DEVICE_CAPABILITY,	/* Device Capability */
+	USB_SS_CAP_TYPE,		/* bDevCapabilityType, SUPERSPEED_USB */
+	0x00,				/* bmAttributes, LTM off by default */
+	USB_5GBPS_OPERATION, 0x00,	/* wSpeedsSupported, 5Gbps only */
+	0x03,				/* bFunctionalitySupport,
+					   USB 3.0 speed only */
+	0x00,				/* bU1DevExitLat, set later. */
+	0x00, 0x00			/* __le16 bU2DevExitLat, set later. */
+};
+
+
 static void xhci_common_hub_descriptor(struct xhci_hcd *xhci,
 		struct usb_hub_descriptor *desc, int ports)
 {
@@ -455,6 +474,21 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 		xhci_hub_descriptor(hcd, xhci,
 				(struct usb_hub_descriptor *) buf);
 		break;
+	case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
+		if ((wValue & 0xff00) != (USB_DT_BOS << 8))
+			goto error;
+
+		if (hcd->speed != HCD_USB3)
+			goto error;
+
+		memcpy(buf, &usb_bos_descriptor,
+				USB_DT_BOS_SIZE + USB_DT_USB_SS_CAP_SIZE);
+		temp = xhci_readl(xhci, &xhci->cap_regs->hcs_params3);
+		buf[12] = HCS_U1_LATENCY(temp);
+		put_unaligned_le16(HCS_U2_LATENCY(temp), &buf[13]);
+
+		spin_unlock_irqrestore(&xhci->lock, flags);
+		return USB_DT_BOS_SIZE + USB_DT_USB_SS_CAP_SIZE;
 	case GetPortStatus:
 		if (!wIndex || wIndex > max_ports)
 			goto error;