[SRU] [B/C/D/Unstable] [PATCH 0/2] Fix non-working QCA Rome Bluetooth after S3

[Kai-Heng Feng]

BugLink: https://bugs.launchpad.net/bugs/1812812

[Impact]
Sometimes QCA Rome Bluetooth USB host doesn't work after S3:
[ 165.110742] Bluetooth: hci0: using NVM file: qca/nvm_usb_00000302.bin
[ 168.432065] Bluetooth: hci0: Failed to send body at 4 of 1953 (-110)

This is due to USB core enables LPM two times after S3.

[Fix]
Only enable LPM once.

[Test]
The Bluetooth USB works all the time after applying the fix.

[Regression Potential]
Low. Enabling a hardware feature twice in a row isn't right, I'd be
surprise if any hardware relies on this driver behavior.

Kai-Heng Feng (2):
  USB: Add new USB LPM helpers
  USB: Consolidate LPM checks to avoid enabling LPM twice

 drivers/usb/core/driver.c  | 23 +++++++++++++++++++----
 drivers/usb/core/hub.c     | 16 ++++++----------
 drivers/usb/core/message.c |  3 +--
 drivers/usb/core/sysfs.c   |  5 ++++-
 drivers/usb/core/usb.h     | 10 ++++++++--
 5 files changed, 38 insertions(+), 19 deletions(-)

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2.17.1