USB: force handover port to companion when hub_port_connect_change fails

This patch hands over the port to the companion when the
hub_port_connect_change fails.
Signed-off-by: Balaji Rao <balajirrao@gmail.com>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/core/hcd.h

@@ -210,6 +210,9 @@ struct hc_driver {
 	int		(*start_port_reset)(struct usb_hcd *, unsigned port_num);
 	void		(*hub_irq_enable)(struct usb_hcd *);
 		/* Needed only if port-change IRQs are level-triggered */
+
+		/* force handover of high-speed port to full-speed companion */
+	void		(*relinquish_port)(struct usb_hcd *, int);
 };
 
 extern int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb);

drivers/usb/core/hub.c

@@ -2482,6 +2482,7 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1,
 {
 	struct usb_device *hdev = hub->hdev;
 	struct device *hub_dev = hub->intfdev;
+	struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
 	u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
 	int status, i;
  
@@ -2645,6 +2646,8 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1,
  
 done:
 	hub_port_disable(hub, port1, 1);
+	if (hcd->driver->relinquish_port && !hub->hdev->parent)
+		hcd->driver->relinquish_port(hcd, port1);
 }
 
 static void hub_events(void)

drivers/usb/host/ehci-au1xxx.c

@@ -222,6 +222,7 @@ static const struct hc_driver ehci_au1xxx_hc_driver = {
 	.hub_control = ehci_hub_control,
 	.bus_suspend = ehci_bus_suspend,
 	.bus_resume = ehci_bus_resume,
+	.relinquish_port = ehci_relinquish_port,
 };
 
 /*-------------------------------------------------------------------------*/

drivers/usb/host/ehci-fsl.c

@@ -323,6 +323,7 @@ static const struct hc_driver ehci_fsl_hc_driver = {
 	.hub_control = ehci_hub_control,
 	.bus_suspend = ehci_bus_suspend,
 	.bus_resume = ehci_bus_resume,
+	.relinquish_port = ehci_relinquish_port,
 };
 
 static int ehci_fsl_drv_probe(struct platform_device *pdev)

drivers/usb/host/ehci-hub.c

@@ -314,41 +314,21 @@ static ssize_t show_companion(struct device *dev,
 }
 
 /*
- * Dedicate or undedicate a port to the companion controller.
- * Syntax is "[-]portnum", where a leading '-' sign means
- * return control of the port to the EHCI controller.
+ * Sets the owner of a port
  */
-static ssize_t store_companion(struct device *dev,
-			       struct device_attribute *attr,
-			       const char *buf, size_t count)
+static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
 {
-	struct ehci_hcd		*ehci;
-	int			portnum, new_owner, try;
 	u32 __iomem		*status_reg;
 	u32			port_status;
+	int 			try;
 
-	ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
-	new_owner = PORT_OWNER;		/* Owned by companion */
-	if (sscanf(buf, "%d", &portnum) != 1)
-		return -EINVAL;
-	if (portnum < 0) {
-		portnum = - portnum;
-		new_owner = 0;		/* Owned by EHCI */
-	}
-	if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
-		return -ENOENT;
-	status_reg = &ehci->regs->port_status[--portnum];
-	if (new_owner)
-		set_bit(portnum, &ehci->companion_ports);
-	else
-		clear_bit(portnum, &ehci->companion_ports);
+	status_reg = &ehci->regs->port_status[portnum];
 
 	/*
 	 * The controller won't set the OWNER bit if the port is
 	 * enabled, so this loop will sometimes require at least two
 	 * iterations: one to disable the port and one to set OWNER.
 	 */
-
 	for (try = 4; try > 0; --try) {
 		spin_lock_irq(&ehci->lock);
 		port_status = ehci_readl(ehci, status_reg);
@@ -365,6 +345,36 @@ static ssize_t store_companion(struct device *dev,
 		if (try > 1)
 			msleep(5);
 	}
+}
+
+/*
+ * Dedicate or undedicate a port to the companion controller.
+ * Syntax is "[-]portnum", where a leading '-' sign means
+ * return control of the port to the EHCI controller.
+ */
+static ssize_t store_companion(struct device *dev,
+			       struct device_attribute *attr,
+			       const char *buf, size_t count)
+{
+	struct ehci_hcd		*ehci;
+	int			portnum, new_owner;
+
+	ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
+	new_owner = PORT_OWNER;		/* Owned by companion */
+	if (sscanf(buf, "%d", &portnum) != 1)
+		return -EINVAL;
+	if (portnum < 0) {
+		portnum = - portnum;
+		new_owner = 0;		/* Owned by EHCI */
+	}
+	if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
+		return -ENOENT;
+	portnum--;
+	if (new_owner)
+		set_bit(portnum, &ehci->companion_ports);
+	else
+		clear_bit(portnum, &ehci->companion_ports);
+	set_owner(ehci, portnum, new_owner);
 	return count;
 }
 static DEVICE_ATTR(companion, 0644, show_companion, store_companion);
@@ -867,3 +877,13 @@ static int ehci_hub_control (
 	spin_unlock_irqrestore (&ehci->lock, flags);
 	return retval;
 }
+
+static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
+{
+	struct ehci_hcd		*ehci = hcd_to_ehci(hcd);
+
+	if (ehci_is_TDI(ehci))
+		return;
+	set_owner(ehci, --portnum, PORT_OWNER);
+}
+

drivers/usb/host/ehci-pci.c

@@ -364,6 +364,7 @@ static const struct hc_driver ehci_pci_hc_driver = {
 	.hub_control =		ehci_hub_control,
 	.bus_suspend =		ehci_bus_suspend,
 	.bus_resume =		ehci_bus_resume,
+	.relinquish_port = 	ehci_relinquish_port,
 };
 
 /*-------------------------------------------------------------------------*/

drivers/usb/host/ehci-ppc-soc.c

@@ -162,6 +162,7 @@ static const struct hc_driver ehci_ppc_soc_hc_driver = {
 	.hub_control = ehci_hub_control,
 	.bus_suspend = ehci_bus_suspend,
 	.bus_resume = ehci_bus_resume,
+	.relinquish_port = ehci_relinquish_port,
 };
 
 static int ehci_hcd_ppc_soc_drv_probe(struct platform_device *pdev)

drivers/usb/host/ehci-ps3.c

@@ -72,6 +72,7 @@ static const struct hc_driver ps3_ehci_hc_driver = {
 	.bus_suspend		= ehci_bus_suspend,
 	.bus_resume		= ehci_bus_resume,
 #endif
+	.relinquish_port	= ehci_relinquish_port,
 };
 
 static int ps3_ehci_probe(struct ps3_system_bus_device *dev)