Commit 971fcd49 authored by Lan Tianyu's avatar Lan Tianyu Committed by Greg Kroah-Hartman
Browse files

usb: add runtime pm support for usb port device 



This patch is to add runtime pm callback for usb port device.
Set/clear PORT_POWER feature in the resume/suspend callback.
Add portnum for struct usb_port to record port number. Do
pm_rumtime_get_sync/put(portdev) when a device is plugged/unplugged
to prevent it from being powered off when it is active.

Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Acked-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: default avatarLan Tianyu <tianyu.lan@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6802771b

drivers/usb/core/hub.c

+27 −0
Original line number Diff line number Diff line
@@ -714,6 +714,27 @@ static void hub_tt_work(struct work_struct *work) 
	spin_unlock_irqrestore (&hub->tt.lock, flags);

}



/**

 * usb_hub_set_port_power - control hub port's power state

 * @hdev: target hub

 * @port1: port index

 * @set: expected status

 *

 * call this function to control port's power via setting or

 * clearing the port's PORT_POWER feature.

 */

int usb_hub_set_port_power(struct usb_device *hdev, int port1,

		bool set)

{

	int ret;



	if (set)

		ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);

	else

		ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER);

	return ret;

}



/**

 * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub

 * @urb: an URB associated with the failed or incomplete split transaction
@@ -1569,6 +1590,7 @@ static void hub_disconnect(struct usb_interface *intf) 
	kfree(hub->status);

	kfree(hub->buffer);



	pm_suspend_ignore_children(&intf->dev, false);

	kref_put(&hub->kref, hub_release);

}
@@ -1671,6 +1693,7 @@ descriptor_error: 


	usb_set_intfdata (intf, hub);

	intf->needs_remote_wakeup = 1;

	pm_suspend_ignore_children(&intf->dev, true);



	if (hdev->speed == USB_SPEED_HIGH)

		highspeed_hubs++;
@@ -1997,6 +2020,8 @@ void usb_disconnect(struct usb_device **pdev) 


		sysfs_remove_link(&udev->dev.kobj, "port");

		sysfs_remove_link(&port_dev->dev.kobj, "device");



		pm_runtime_put(&port_dev->dev);

	}



	usb_remove_ep_devs(&udev->ep0);
@@ -2307,6 +2332,8 @@ int usb_new_device(struct usb_device *udev) 
			sysfs_remove_link(&udev->dev.kobj, "port");

			goto fail;

		}



		pm_runtime_get_sync(&port_dev->dev);

	}



	(void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev);

drivers/usb/core/hub.h

+4 −0
Original line number Diff line number Diff line
@@ -79,12 +79,14 @@ struct usb_hub { 
 * @dev: generic device interface

 * @port_owner: port's owner

 * @connect_type: port's connect type

 * @portnum: port index num based one

 */

struct usb_port {

	struct usb_device *child;

	struct device dev;

	struct dev_state *port_owner;

	enum usb_port_connect_type connect_type;

	u8 portnum;

};



#define to_usb_port(_dev) \
@@ -94,4 +96,6 @@ extern int usb_hub_create_port_device(struct usb_hub *hub, 
		int port1);

extern void usb_hub_remove_port_device(struct usb_hub *hub,

		int port1);

extern int usb_hub_set_port_power(struct usb_device *hdev,

		int port1, bool set);

drivers/usb/core/port.c

+46 −0
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ 
 */



#include <linux/slab.h>

#include <linux/pm_qos.h>



#include "hub.h"
@@ -70,9 +71,50 @@ static void usb_port_device_release(struct device *dev) 
	kfree(port_dev);

}



#ifdef CONFIG_USB_SUSPEND

static int usb_port_runtime_resume(struct device *dev)

{

	struct usb_port *port_dev = to_usb_port(dev);

	struct usb_device *hdev = to_usb_device(dev->parent->parent);

	struct usb_interface *intf = to_usb_interface(dev->parent);

	int retval;



	usb_autopm_get_interface(intf);

	retval = usb_hub_set_port_power(hdev, port_dev->portnum, true);

	usb_autopm_put_interface(intf);

	return retval;

}



static int usb_port_runtime_suspend(struct device *dev)

{

	struct usb_port *port_dev = to_usb_port(dev);

	struct usb_device *hdev = to_usb_device(dev->parent->parent);

	struct usb_interface *intf = to_usb_interface(dev->parent);

	int retval;



	if (dev_pm_qos_flags(&port_dev->dev, PM_QOS_FLAG_NO_POWER_OFF)

			== PM_QOS_FLAGS_ALL)

		return -EAGAIN;



	usb_autopm_get_interface(intf);

	retval = usb_hub_set_port_power(hdev, port_dev->portnum, false);

	usb_autopm_put_interface(intf);

	return retval;

}

#endif



static const struct dev_pm_ops usb_port_pm_ops = {

#ifdef CONFIG_USB_SUSPEND

	.runtime_suspend =	usb_port_runtime_suspend,

	.runtime_resume =	usb_port_runtime_resume,

	.runtime_idle =		pm_generic_runtime_idle,

#endif

};



struct device_type usb_port_device_type = {

	.name =		"usb_port",

	.release =	usb_port_device_release,

	.pm =		&usb_port_pm_ops,

};



int usb_hub_create_port_device(struct usb_hub *hub, int port1)
@@ -87,6 +129,7 @@ int usb_hub_create_port_device(struct usb_hub *hub, int port1) 
	}



	hub->ports[port1 - 1] = port_dev;

	port_dev->portnum = port1;

	port_dev->dev.parent = hub->intfdev;

	port_dev->dev.groups = port_dev_group;

	port_dev->dev.type = &usb_port_device_type;
@@ -96,6 +139,9 @@ int usb_hub_create_port_device(struct usb_hub *hub, int port1) 
	if (retval)

		goto error_register;



	pm_runtime_set_active(&port_dev->dev);

	pm_runtime_enable(&port_dev->dev);



	retval = usb_acpi_register_power_resources(&port_dev->dev);

	if (retval && retval != -ENODEV)

		dev_warn(&port_dev->dev, "the port can't register its ACPI power resource.\n");

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