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: Alan Stern <st...@rowland.harvard.edu>
Acked-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com>
Signed-off-by: Lan Tianyu <tianyu....@intel.com>
---
drivers/usb/core/hub.c | 27 +++++++++++++++++++++++++++
drivers/usb/core/hub.h | 4 ++++
drivers/usb/core/port.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 77 insertions(+)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 29ca6ed..7fb1633 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -715,6 +715,27 @@ static void hub_tt_work(struct work_struct *work)
}
/**
+ * 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);
diff --git a/drivers/usb/core/hub.h b/drivers/usb/core/hub.h
index d16a7c9..8ea6bc8 100644
--- a/drivers/usb/core/hub.h
+++ b/drivers/usb/core/hub.h
@@ -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);
diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c
index 153e799..169c89e 100644
--- a/drivers/usb/core/port.c
+++ b/drivers/usb/core/port.c
@@ -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");
--
1.7.9.5
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