diff options
| author | Kevin Strasser <kevin.strasser@linux.intel.com> | 2015-06-16 20:35:30 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-07-23 01:45:03 +0300 |
| commit | 655fe4effe0f1f40e4f6ca6b3cc64a7fe0032183 (patch) | |
| tree | 00e7be3af68a08b25e6688fc8d4571124b81d704 /Documentation/ABI | |
| parent | eb4861c3cef7f745df0d2a26b0f4287da0190424 (diff) | |
| download | linux-655fe4effe0f1f40e4f6ca6b3cc64a7fe0032183.tar.xz | |
usbcore: add sysfs support to xHCI usb3 hardware LPM
Add a sysfs node to make it easier to verify if LPM is supported and being
enabled for USB 3.0 devices.
Signed-off-by: Kevin Strasser <kevin.strasser@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-usb | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-usb b/Documentation/ABI/testing/sysfs-bus-usb index e5cc7633d013..e935625f5995 100644 --- a/Documentation/ABI/testing/sysfs-bus-usb +++ b/Documentation/ABI/testing/sysfs-bus-usb @@ -114,6 +114,20 @@ Description: enabled for the device. Developer can write y/Y/1 or n/N/0 to the file to enable/disable the feature. +What: /sys/bus/usb/devices/.../power/usb3_hardware_lpm +Date: June 2015 +Contact: Kevin Strasser <kevin.strasser@linux.intel.com> +Description: + If CONFIG_PM_RUNTIME is set and a USB 3.0 lpm-capable device is + plugged in to a xHCI host which supports link PM, it will check + if U1 and U2 exit latencies have been set in the BOS + descriptor; if the check is is passed and the host supports + USB3 hardware LPM, USB3 hardware LPM will be enabled for the + device and the USB device directory will contain a file named + power/usb3_hardware_lpm. The file holds a string value (enable + or disable) indicating whether or not USB3 hardware LPM is + enabled for the device. + What: /sys/bus/usb/devices/.../removable Date: February 2012 Contact: Matthew Garrett <mjg@redhat.com> |