diff options
| author | Andiry Xu <andiry.xu@amd.com> | 2011-09-23 21:19:52 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-09-26 22:51:10 (GMT) |
| commit | 65580b4321eb36f16ae8b5987bfa1bb948fc5112 (patch) | |
| tree | 12735f923ad670c405efb5ab34c188dc06ad15f7 /drivers/usb/core/driver.c | |
| parent | 9574323c39d1f8359a04843075d89c9f32d8b7e6 (diff) | |
| download | linux-65580b4321eb36f16ae8b5987bfa1bb948fc5112.tar.xz | |
xHCI: set USB2 hardware LPM
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>
Diffstat (limited to 'drivers/usb/core/driver.c')
| -rw-r--r-- | drivers/usb/core/driver.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index 14b83f2..adf5ca8 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -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 = { |