lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

xHCI: set USB2 hardware LPM

Browse Source 
If the device pass the USB2 software LPM and the host supports hardware
LPM, enable hardware LPM for the device to let the host decide when to
put the link into lower power state.

If hardware LPM is enabled for a port and driver wants to put it into
suspend, it must first disable hardware LPM, resume the port into U0,
and then suspend the port.

Signed-off-by: Andiry Xu <andiry.xu@amd.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Andiry Xu
2011-09-23 14:19:52 -07:00
committed by Greg Kroah-Hartman
parent 9574323c39
commit 65580b4321
9 changed files with 120 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/usb/core/driver.c
View File

@@ -1700,6 +1700,20 @@ int usb_runtime_idle(struct device *dev)
return 0;
}
int usb_set_usb2_hardware_lpm(struct usb_device *udev, int enable)
{
struct usb_hcd *hcd = bus_to_hcd(udev->bus);
int ret = -EPERM;
if (hcd->driver->set_usb2_hw_lpm) {
ret = hcd->driver->set_usb2_hw_lpm(hcd, udev, enable);
if (!ret)
udev->usb2_hw_lpm_enabled = enable;
}
return ret;
}
#endif /* CONFIG_USB_SUSPEND */
struct bus_type usb_bus_type = {

9
drivers/usb/core/hub.c
View File

@@ -2392,6 +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,
@@ -2603,7 +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;
}

5
drivers/usb/core/usb.h
View File

@@ -82,6 +82,7 @@ extern int usb_remote_wakeup(struct usb_device *dev);
extern int usb_runtime_suspend(struct device *dev);
extern int usb_runtime_resume(struct device *dev);
extern int usb_runtime_idle(struct device *dev);
extern int usb_set_usb2_hardware_lpm(struct usb_device *udev, int enable);
#else
@@ -96,6 +97,10 @@ static inline int usb_remote_wakeup(struct usb_device *udev)
return 0;
}
static inline int usb_set_usb2_hardware_lpm(struct usb_device *udev, int enable)
{
return 0;
}
#endif
extern struct bus_type usb_bus_type;