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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-07-16 16:58:30 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-07-16 16:58:30 -0700 |
| commit | 6470cbc486652942dcf6c4b6420e3a521e766bbf (patch) | |
| tree | 3244e6e1998031ac17e12283b2f797e60743d93b /Documentation/ABI | |
| parent | 43fe3a99d9caf10b25f9c596e9854cdae30db418 (diff) | |
| parent | 024f117c2f3c4bb5df6e6696b709e0f3ed7e5dbb (diff) | |
Merge tag 'for-usb-next-2012-07-11' of git://git.kernel.org/pub/scm/linux/kernel/git/sarah/xhci into usb-next
USB: Link PM fixes and Latency Tolerance Messaging
Hi Greg,
Here's four bug fix patches for Link PM (LPM), which are marked for
3.5-stable. There's also three patches that turn on Latency Tolerance
Messaging (LTM) for xHCI host controllers and USB 3.0 devices that support
this low power feature.
Please queue for 3.6.
Sarah Sharp
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-usb | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-usb b/Documentation/ABI/testing/sysfs-bus-usb index 6df4e6f57560..5f75f8f7df34 100644 --- a/Documentation/ABI/testing/sysfs-bus-usb +++ b/Documentation/ABI/testing/sysfs-bus-usb @@ -208,3 +208,15 @@ Description: such as ACPI. This file will read either "removable" or "fixed" if the information is available, and "unknown" otherwise. + +What: /sys/bus/usb/devices/.../ltm_capable +Date: July 2012 +Contact: Sarah Sharp <sarah.a.sharp@linux.intel.com> +Description: + USB 3.0 devices may optionally support Latency Tolerance + Messaging (LTM). They indicate their support by setting a bit + in the bmAttributes field of their SuperSpeed BOS descriptors. + If that bit is set for the device, ltm_capable will read "yes". + If the device doesn't support LTM, the file will read "no". + The file will be present for all speeds of USB devices, and will + always read "no" for USB 1.1 and USB 2.0 devices. |