[PATCH 0/4][SRU][F/H] Fix cold plugged USB device on certain PCIe USB cards

[Chris Chiu]

BugLink: https://bugs.launchpad.net/bugs/1945211

[SRU Justification]

[Impact]
Cold plugged USB device was not detected on certain PCIe USB cards
(like Inateck card connected to AM64 EVM or connected to J7200 EVM).
And also the root hub mentioned in https://bugs.launchpad.net/bugs/1939638.

Re-plugging the USB device always gets it enumerated.

[Fix]
As soonprimary roothub is registered, port status change is handled
even before xHC is running and leads to cold plug USB devices not 
detected. Register both root hubs along with the secondary hcd for xhci.

[Test Case]
1. Plug the USB device to the ports of problematic root hub.
2. Power on the machine.
3. Check if the USB device can work or not after boot.

[Regression Potential]
Low. It simply make sure both primary and secondary roothubs are registered along with the second HCD.

Chris Chiu (1):
  Revert "UBUNTU: SAUCE: Revert "usb: core: reduce power-on-good delay
    time of root hub""

Kishon Vijay Abraham I (3):
  usb: core: hcd: Add support for deferring roothub registration
  xhci: Set HCD flag to defer primary roothub registration
  usb: core: hcd: Modularize HCD stop configuration in usb_stop_hcd()

 drivers/usb/core/hcd.c  | 68 +++++++++++++++++++++++++++--------------
 drivers/usb/core/hub.h  |  6 ++--
 drivers/usb/host/xhci.c |  1 +
 include/linux/usb/hcd.h |  2 ++
 4 files changed, 52 insertions(+), 25 deletions(-)

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2.25.1