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authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-07-16 19:58:30 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-07-16 19:58:30 -0400
commit6470cbc486652942dcf6c4b6420e3a521e766bbf (patch)
tree3244e6e1998031ac17e12283b2f797e60743d93b /Documentation
parent43fe3a99d9caf10b25f9c596e9854cdae30db418 (diff)
parent024f117c2f3c4bb5df6e6696b709e0f3ed7e5dbb (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')
-rw-r--r--Documentation/ABI/testing/sysfs-bus-usb12
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:
208 such as ACPI. This file will read either "removable" or 208 such as ACPI. This file will read either "removable" or
209 "fixed" if the information is available, and "unknown" 209 "fixed" if the information is available, and "unknown"
210 otherwise. 210 otherwise.
211
212What: /sys/bus/usb/devices/.../ltm_capable
213Date: July 2012
214Contact: Sarah Sharp <sarah.a.sharp@linux.intel.com>
215Description:
216 USB 3.0 devices may optionally support Latency Tolerance
217 Messaging (LTM). They indicate their support by setting a bit
218 in the bmAttributes field of their SuperSpeed BOS descriptors.
219 If that bit is set for the device, ltm_capable will read "yes".
220 If the device doesn't support LTM, the file will read "no".
221 The file will be present for all speeds of USB devices, and will
222 always read "no" for USB 1.1 and USB 2.0 devices.