[PATCH 0/9] xhci: usb: optimize resuming from S4 (suspend-to-disk)

[Niklas Neronin <niklas.neronin@linux.intel.com>]

On resume from S4, the xHCI controller loses register state, but the
driver currently responds by tearing down and fully reinitializing all
xhci data structures.

This is unnecessary. Instead of freeing and reallocating driver structures,
simply reset the required memory and restore the hardware registers that
lost their contents across hibernation.

Changes since RFCv2:
 * Fix virtual device itteration from max-ports to slots.

Niklas Neronin (9):
  usb: xhci: simplify CMRT initialization logic
  usb: xhci: relocate Restore/Controller error check
  usb: xhci: factor out roothub bandwidth cleanup
  usb: xhci: move reserving command ring trb
  usb: xhci: move ring initialization
  usb: xhci: move initialization for lifetime objects
  usb: xhci: split core allocation and initialization
  usb: xhci: improve debug messages during suspend
  usb: xhci: optimize resuming from S4 (suspend-to-disk)

 drivers/usb/host/xhci-mem.c |  82 +++++++++-------
 drivers/usb/host/xhci.c     | 183 +++++++++++++++++++-----------------
 drivers/usb/host/xhci.h     |   3 +
 3 files changed, 148 insertions(+), 120 deletions(-)

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2.50.1