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Commit 90da096e authored by Balaji Rao's avatar Balaji Rao Committed by Greg Kroah-Hartman
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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: default avatarBalaji Rao <balajirrao@gmail.com>
Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent eb0be47d

drivers/usb/core/hcd.h

+3 −0
Original line number Diff line number Diff line
@@ -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

+3 −0
Original line number Diff line number Diff line
@@ -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 @@ loop: 
 

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

+1 −0
Original line number Diff line number Diff line
@@ -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

+1 −0
Original line number Diff line number Diff line
@@ -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

+44 −24
Original line number Diff line number Diff line
@@ -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 @@ error: 
	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);

}