Hi Greg, Alan, and Andiry,
Here's revision 2 of the Latency Tolerance Messaging (LTM) patchset.
The first four patches are bug fixes for the Link Power Management (LPM)
code. As I told Alan, I discovered that unconfigured USB 3.0 devices
can't be sent a Set/Clear Feature U1/U2 request. These four patches
rework the USB core LPM code to only enable and disable LPM when the
device is configured.
The last three patches are a new revision of the LTM patchset. Changes
since v1:
- Fix the xHCI driver to actually export the LTM capability
- Add a sysfs file in the usb device directory called ltm_capable
- Remove the forward declarations of usb_enable/disable_ltm()
- Don't check for !hcd
- Remove confusing comment in usb_disable_ltm()
- Simplify LTM disable/enable in usb_reset_and_verify_device()
The last change was actually quite easy once I fixed the LPM code to not
enable LPM when the device was unconfigured. That removed a lot of the
usb_enable_lpm() calls in usb_reset_and_verify_device(), and most of the
calls to usb_enable_ltm() have been removed for the same reason.
Greg, I didn't know whether the LPM fixes could make it into your
usb-linus queue before the merge window, so I marked them for 3.5
stable.
Sarah Sharp
The following changes since commit ff9cce82772a78983b529e044d85884d3ec95fda:
Merge tag 'xceiv-for-v3.6' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb into usb-next (2012-07-05 15:35:41 -0700)
are available in the git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/sarah/xhci.git ltm-v3
for you to fetch changes up to e18bbb85c492445fe091035f011f39ef4f6d382f:
USB: Add a sysfs file to show LTM capabilities. (2012-07-05 18:51:43 -0700)
----------------------------------------------------------------
Sarah Sharp (7):
xhci: Fix LPM disable/enable during device reset.
xhci: Disable LPM while the device is unconfigured.
USB: Fix LPM disable count mismatch on driver unbind.
USB: Remove unused LPM variable.
xhci: Export Latency Tolerance Messaging capabilities.
USB: Enable Latency Tolerance Messaging (LTM).
USB: Add a sysfs file to show LTM capabilities.
drivers/usb/core/hub.c | 100 +++++++++++++++++++++++++++++++++++-------
drivers/usb/core/message.c | 11 +++-
drivers/usb/core/sysfs.c | 10 ++++
drivers/usb/core/usb.c | 1 +
drivers/usb/host/xhci-hub.c | 6 +++
include/linux/usb.h | 12 +++++-
6 files changed, 119 insertions(+), 21 deletions(-)
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