[OEM-OSP1-B] [PATCH 0/4] Make hotplugging docking station to Thunderbolt port more reliable

[Kai-Heng Feng]

BugLink: https://bugs.launchpad.net/bugs/1853991

[Impact]
Sometimes USB ports and USB ethernet on Thunderbolt Docking don't work
after hotplugging.

[Fix]
Add proper link delay when PCIe devices transit out from D3cold.

[Test]
Tested with Dell WD19DC docking station on Dell XPS 9380. After applying
the fix, the USB ports on docking always work after hotplugging.

[Regression Potential]
Low. This patch series adds proper delay required by PCIe spec, and only
affects hotplug ports, i.e. Thunderbolt.

Mika Westerberg (3):
  PCI: Make pcie_downstream_port() available outside of access.c
  PCI/PM: Add pcie_wait_for_link_delay()
  PCI/PM: Add missing link delays required by the PCIe spec

Rafael J. Wysocki (1):
  PCI: PM: Avoid skipping bus-level PM on platforms without ACPI

 drivers/pci/access.c     |   9 ---
 drivers/pci/pci-driver.c |  17 +++--
 drivers/pci/pci.c        | 142 +++++++++++++++++++++++++++++++++++++--
 drivers/pci/pci.h        |  10 +++
 include/linux/suspend.h  |  26 ++++++-
 kernel/power/suspend.c   |   3 +
 6 files changed, 187 insertions(+), 20 deletions(-)

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2.17.1