1 files changed, 183 insertions, 128 deletions

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index a428aa080a36..d6cc83249341 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1636,11 +1636,6 @@ void usb_disconnect(struct usb_device **pdev)
 	int			i;
 	struct usb_hcd		*hcd = bus_to_hcd(udev->bus);
 
-	if (!udev) {
-		pr_debug ("%s nodev\n", __func__);
-		return;
-	}
-
 	/* mark the device as inactive, so any further urb submissions for
 	 * this device (and any of its children) will fail immediately.
 	 * this quiesces everything except pending urbs.
@@ -2030,11 +2025,23 @@ static unsigned hub_is_wusb(struct usb_hub *hub)
 
 #define HUB_ROOT_RESET_TIME	50	/* times are in msec */
 #define HUB_SHORT_RESET_TIME	10
+#define HUB_BH_RESET_TIME	50
 #define HUB_LONG_RESET_TIME	200
 #define HUB_RESET_TIMEOUT	500
 
+static int hub_port_reset(struct usb_hub *hub, int port1,
+			struct usb_device *udev, unsigned int delay, bool warm);
+
+/* Is a USB 3.0 port in the Inactive state? */
+static bool hub_port_inactive(struct usb_hub *hub, u16 portstatus)
+{
+	return hub_is_superspeed(hub->hdev) &&
+		(portstatus & USB_PORT_STAT_LINK_STATE) ==
+		USB_SS_PORT_LS_SS_INACTIVE;
+}
+
 static int hub_port_wait_reset(struct usb_hub *hub, int port1,
-				struct usb_device *udev, unsigned int delay)
+			struct usb_device *udev, unsigned int delay, bool warm)
 {
 	int delay_time, ret;
 	u16 portstatus;
@@ -2051,28 +2058,71 @@ static int hub_port_wait_reset(struct usb_hub *hub, int port1,
 		if (ret < 0)
 			return ret;
 
-		/* Device went away? */
-		if (!(portstatus & USB_PORT_STAT_CONNECTION))
-			return -ENOTCONN;
-
-		/* bomb out completely if the connection bounced */
-		if ((portchange & USB_PORT_STAT_C_CONNECTION))
-			return -ENOTCONN;
-
-		/* if we`ve finished resetting, then break out of the loop */
-		if (!(portstatus & USB_PORT_STAT_RESET) &&
-		    (portstatus & USB_PORT_STAT_ENABLE)) {
-			if (hub_is_wusb(hub))
-				udev->speed = USB_SPEED_WIRELESS;
-			else if (hub_is_superspeed(hub->hdev))
-				udev->speed = USB_SPEED_SUPER;
-			else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
-				udev->speed = USB_SPEED_HIGH;
-			else if (portstatus & USB_PORT_STAT_LOW_SPEED)
-				udev->speed = USB_SPEED_LOW;
-			else
-				udev->speed = USB_SPEED_FULL;
-			return 0;
+		/*
+		 * Some buggy devices require a warm reset to be issued even
+		 * when the port appears not to be connected.
+		 */
+		if (!warm) {
+			/*
+			 * Some buggy devices can cause an NEC host controller
+			 * to transition to the "Error" state after a hot port
+			 * reset.  This will show up as the port state in
+			 * "Inactive", and the port may also report a
+			 * disconnect.  Forcing a warm port reset seems to make
+			 * the device work.
+			 *
+			 * See https://bugzilla.kernel.org/show_bug.cgi?id=41752
+			 */
+			if (hub_port_inactive(hub, portstatus)) {
+				int ret;
+
+				if ((portchange & USB_PORT_STAT_C_CONNECTION))
+					clear_port_feature(hub->hdev, port1,
+							USB_PORT_FEAT_C_CONNECTION);
+				if (portchange & USB_PORT_STAT_C_LINK_STATE)
+					clear_port_feature(hub->hdev, port1,
+							USB_PORT_FEAT_C_PORT_LINK_STATE);
+				if (portchange & USB_PORT_STAT_C_RESET)
+					clear_port_feature(hub->hdev, port1,
+							USB_PORT_FEAT_C_RESET);
+				dev_dbg(hub->intfdev, "hot reset failed, warm reset port %d\n",
+						port1);
+				ret = hub_port_reset(hub, port1,
+						udev, HUB_BH_RESET_TIME,
+						true);
+				if ((portchange & USB_PORT_STAT_C_CONNECTION))
+					clear_port_feature(hub->hdev, port1,
+							USB_PORT_FEAT_C_CONNECTION);
+				return ret;
+			}
+			/* Device went away? */
+			if (!(portstatus & USB_PORT_STAT_CONNECTION))
+				return -ENOTCONN;
+
+			/* bomb out completely if the connection bounced */
+			if ((portchange & USB_PORT_STAT_C_CONNECTION))
+				return -ENOTCONN;
+
+			/* if we`ve finished resetting, then break out of
+			 * the loop
+			 */
+			if (!(portstatus & USB_PORT_STAT_RESET) &&
+			    (portstatus & USB_PORT_STAT_ENABLE)) {
+				if (hub_is_wusb(hub))
+					udev->speed = USB_SPEED_WIRELESS;
+				else if (hub_is_superspeed(hub->hdev))
+					udev->speed = USB_SPEED_SUPER;
+				else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
+					udev->speed = USB_SPEED_HIGH;
+				else if (portstatus & USB_PORT_STAT_LOW_SPEED)
+					udev->speed = USB_SPEED_LOW;
+				else
+					udev->speed = USB_SPEED_FULL;
+				return 0;
+			}
+		} else {
+			if (portchange & USB_PORT_STAT_C_BH_RESET)
+				return 0;
 		}
 
 		/* switch to the long delay after two short delay failures */
@@ -2080,35 +2130,84 @@ static int hub_port_wait_reset(struct usb_hub *hub, int port1,
 			delay = HUB_LONG_RESET_TIME;
 
 		dev_dbg (hub->intfdev,
-			"port %d not reset yet, waiting %dms\n",
-			port1, delay);
+			"port %d not %sreset yet, waiting %dms\n",
+			port1, warm ? "warm " : "", delay);
 	}
 
 	return -EBUSY;
 }
 
+static void hub_port_finish_reset(struct usb_hub *hub, int port1,
+			struct usb_device *udev, int *status, bool warm)
+{
+	switch (*status) {
+	case 0:
+		if (!warm) {
+			struct usb_hcd *hcd;
+			/* TRSTRCY = 10 ms; plus some extra */
+			msleep(10 + 40);
+			update_devnum(udev, 0);
+			hcd = bus_to_hcd(udev->bus);
+			if (hcd->driver->reset_device) {
+				*status = hcd->driver->reset_device(hcd, udev);
+				if (*status < 0) {
+					dev_err(&udev->dev, "Cannot reset "
+							"HCD device state\n");
+					break;
+				}
+			}
+		}
+		/* FALL THROUGH */
+	case -ENOTCONN:
+	case -ENODEV:
+		clear_port_feature(hub->hdev,
+				port1, USB_PORT_FEAT_C_RESET);
+		/* FIXME need disconnect() for NOTATTACHED device */
+		if (warm) {
+			clear_port_feature(hub->hdev, port1,
+					USB_PORT_FEAT_C_BH_PORT_RESET);
+			clear_port_feature(hub->hdev, port1,
+					USB_PORT_FEAT_C_PORT_LINK_STATE);
+		} else {
+			usb_set_device_state(udev, *status
+					? USB_STATE_NOTATTACHED
+					: USB_STATE_DEFAULT);
+		}
+		break;
+	}
+}
+
+/* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */
 static int hub_port_reset(struct usb_hub *hub, int port1,
-				struct usb_device *udev, unsigned int delay)
+			struct usb_device *udev, unsigned int delay, bool warm)
 {
 	int i, status;
-	struct usb_hcd *hcd;
 
-	hcd = bus_to_hcd(udev->bus);
-	/* Block EHCI CF initialization during the port reset.
-	 * Some companion controllers don't like it when they mix.
-	 */
-	down_read(&ehci_cf_port_reset_rwsem);
+	if (!warm) {
+		/* Block EHCI CF initialization during the port reset.
+		 * Some companion controllers don't like it when they mix.
+		 */
+		down_read(&ehci_cf_port_reset_rwsem);
+	} else {
+		if (!hub_is_superspeed(hub->hdev)) {
+			dev_err(hub->intfdev, "only USB3 hub support "
+						"warm reset\n");
+			return -EINVAL;
+		}
+	}
 
 	/* Reset the port */
 	for (i = 0; i < PORT_RESET_TRIES; i++) {
-		status = set_port_feature(hub->hdev,
-				port1, USB_PORT_FEAT_RESET);
-		if (status)
+		status = set_port_feature(hub->hdev, port1, (warm ?
+					USB_PORT_FEAT_BH_PORT_RESET :
+					USB_PORT_FEAT_RESET));
+		if (status) {
 			dev_err(hub->intfdev,
-					"cannot reset port %d (err = %d)\n",
-					port1, status);
-		else {
-			status = hub_port_wait_reset(hub, port1, udev, delay);
+					"cannot %sreset port %d (err = %d)\n",
+					warm ? "warm " : "", port1, status);
+		} else {
+			status = hub_port_wait_reset(hub, port1, udev, delay,
+								warm);
 			if (status && status != -ENOTCONN)
 				dev_dbg(hub->intfdev,
 						"port_wait_reset: err = %d\n",
@@ -2116,34 +2215,14 @@ static int hub_port_reset(struct usb_hub *hub, int port1,
 		}
 
 		/* return on disconnect or reset */
-		switch (status) {
-		case 0:
-			/* TRSTRCY = 10 ms; plus some extra */
-			msleep(10 + 40);
-			update_devnum(udev, 0);
-			if (hcd->driver->reset_device) {
-				status = hcd->driver->reset_device(hcd, udev);
-				if (status < 0) {
-					dev_err(&udev->dev, "Cannot reset "
-							"HCD device state\n");
-					break;
-				}
-			}
-			/* FALL THROUGH */
-		case -ENOTCONN:
-		case -ENODEV:
-			clear_port_feature(hub->hdev,
-				port1, USB_PORT_FEAT_C_RESET);
-			/* FIXME need disconnect() for NOTATTACHED device */
-			usb_set_device_state(udev, status
-					? USB_STATE_NOTATTACHED
-					: USB_STATE_DEFAULT);
+		if (status == 0 || status == -ENOTCONN || status == -ENODEV) {
+			hub_port_finish_reset(hub, port1, udev, &status, warm);
 			goto done;
 		}
 
 		dev_dbg (hub->intfdev,
-			"port %d not enabled, trying reset again...\n",
-			port1);
+			"port %d not enabled, trying %sreset again...\n",
+			port1, warm ? "warm " : "");
 		delay = HUB_LONG_RESET_TIME;
 	}
 
@@ -2151,45 +2230,11 @@ static int hub_port_reset(struct usb_hub *hub, int port1,
 		"Cannot enable port %i.  Maybe the USB cable is bad?\n",
 		port1);
 
- done:
-	up_read(&ehci_cf_port_reset_rwsem);
-	return status;
-}
-
-/* Warm reset a USB3 protocol port */
-static int hub_port_warm_reset(struct usb_hub *hub, int port)
-{
-	int ret;
-	u16 portstatus, portchange;
-
-	if (!hub_is_superspeed(hub->hdev)) {
-		dev_err(hub->intfdev, "only USB3 hub support warm reset\n");
-		return -EINVAL;
-	}
-
-	/* Warm reset the port */
-	ret = set_port_feature(hub->hdev,
-				port, USB_PORT_FEAT_BH_PORT_RESET);
-	if (ret) {
-		dev_err(hub->intfdev, "cannot warm reset port %d\n", port);
-		return ret;
-	}
-
-	msleep(20);
-	ret = hub_port_status(hub, port, &portstatus, &portchange);
-
-	if (portchange & USB_PORT_STAT_C_RESET)
-		clear_port_feature(hub->hdev, port, USB_PORT_FEAT_C_RESET);
-
-	if (portchange & USB_PORT_STAT_C_BH_RESET)
-		clear_port_feature(hub->hdev, port,
-					USB_PORT_FEAT_C_BH_PORT_RESET);
-
-	if (portchange & USB_PORT_STAT_C_LINK_STATE)
-		clear_port_feature(hub->hdev, port,
-					USB_PORT_FEAT_C_PORT_LINK_STATE);
+done:
+	if (!warm)
+		up_read(&ehci_cf_port_reset_rwsem);
 
-	return ret;
+	return status;
 }
 
 /* Check if a port is power on */
@@ -2347,6 +2392,10 @@ int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
 		}
 	}
 
+	/* disable USB2 hardware LPM */
+	if (udev->usb2_hw_lpm_enabled == 1)
+		usb_set_usb2_hardware_lpm(udev, 0);
+
 	/* see 7.1.7.6 */
 	if (hub_is_superspeed(hub->hdev))
 		status = set_port_feature(hub->hdev,
@@ -2558,7 +2607,12 @@ int usb_port_resume(struct usb_device *udev, pm_message_t msg)
 	if (status < 0) {
 		dev_dbg(&udev->dev, "can't resume, status %d\n", status);
 		hub_port_logical_disconnect(hub, port1);
+	} else  {
+		/* Try to enable USB2 hardware LPM */
+		if (udev->usb2_hw_lpm_capable == 1)
+			usb_set_usb2_hardware_lpm(udev, 1);
 	}
+
 	return status;
 }
 
@@ -2798,7 +2852,7 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
 	int			i, j, retval;
 	unsigned		delay = HUB_SHORT_RESET_TIME;
 	enum usb_device_speed	oldspeed = udev->speed;
-	char 			*speed, *type;
+	const char		*speed;
 	int			devnum = udev->devnum;
 
 	/* root hub ports have a slightly longer reset period
@@ -2819,7 +2873,7 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
 
 	/* Reset the device; full speed may morph to high speed */
 	/* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */
-	retval = hub_port_reset(hub, port1, udev, delay);
+	retval = hub_port_reset(hub, port1, udev, delay, false);
 	if (retval < 0)		/* error or disconnect */
 		goto fail;
 	/* success, speed is known */
@@ -2858,25 +2912,16 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
 	default:
 		goto fail;
 	}
- 
-	type = "";
-	switch (udev->speed) {
-	case USB_SPEED_LOW:	speed = "low";	break;
-	case USB_SPEED_FULL:	speed = "full";	break;
-	case USB_SPEED_HIGH:	speed = "high";	break;
-	case USB_SPEED_SUPER:
-				speed = "super";
-				break;
-	case USB_SPEED_WIRELESS:
-				speed = "variable";
-				type = "Wireless ";
-				break;
-	default: 		speed = "?";	break;
-	}
+
+	if (udev->speed == USB_SPEED_WIRELESS)
+		speed = "variable speed Wireless";
+	else
+		speed = usb_speed_string(udev->speed);
+
 	if (udev->speed != USB_SPEED_SUPER)
 		dev_info(&udev->dev,
-				"%s %s speed %sUSB device number %d using %s\n",
-				(udev->config) ? "reset" : "new", speed, type,
+				"%s %s USB device number %d using %s\n",
+				(udev->config) ? "reset" : "new", speed,
 				devnum, udev->bus->controller->driver->name);
 
 	/* Set up TT records, if needed  */
@@ -2949,7 +2994,7 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
 					buf->bMaxPacketSize0;
 			kfree(buf);
 
-			retval = hub_port_reset(hub, port1, udev, delay);
+			retval = hub_port_reset(hub, port1, udev, delay, false);
 			if (retval < 0)		/* error or disconnect */
 				goto fail;
 			if (oldspeed != udev->speed) {
@@ -3023,7 +3068,7 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
 		i = 512;
 	else
 		i = udev->descriptor.bMaxPacketSize0;
-	if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
+	if (usb_endpoint_maxp(&udev->ep0.desc) != i) {
 		if (udev->speed == USB_SPEED_LOW ||
 				!(i == 8 || i == 16 || i == 32 || i == 64)) {
 			dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i);
@@ -3047,6 +3092,15 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
 		goto fail;
 	}
 
+	if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) {
+		retval = usb_get_bos_descriptor(udev);
+		if (!retval) {
+			if (udev->bos->ext_cap && (USB_LPM_SUPPORT &
+				le32_to_cpu(udev->bos->ext_cap->bmAttributes)))
+					udev->lpm_capable = 1;
+		}
+	}
+
 	retval = 0;
 	/* notify HCD that we have a device connected and addressed */
 	if (hcd->driver->update_device)
@@ -3570,7 +3624,8 @@ static void hub_events(void)
 				(portstatus & USB_PORT_STAT_LINK_STATE)
 					== USB_SS_PORT_LS_SS_INACTIVE) {
 				dev_dbg(hub_dev, "warm reset port %d\n", i);
-				hub_port_warm_reset(hub, i);
+				hub_port_reset(hub, i, NULL,
+						HUB_BH_RESET_TIME, true);
 			}
 
 			if (connect_change)