[SRU] [Unstable/OEM-5.6] [PATCH 0/1] Enable ASPM for links under VMD domain

[Kai-Heng Feng]

BugLink: https://bugs.launchpad.net/bugs/1889384

[Impact]
New Intel laptops with VMD cannot reach deeper power saving state,
renders very short battery time.

[Fix]
Introduce a new quirk to program ASPM settings on bridges under VMD.

[Test Case]
A simple command to grep current LnkCtl state:

  $ sudo lspci -vv | grep -E '^(1|\s+LnkCtl:)'

Confirm ASPM is enabled.

[Regression Potential]
None. The quirk matches device IDs that are specific to Intel Tigerlake
systems, which are not on the market yet.

Kai-Heng Feng (1):
  PCI/ASPM: Enable ASPM for links under VMD domain

 drivers/pci/pcie/aspm.c |  3 ++-
 drivers/pci/quirks.c    | 11 +++++++++++
 include/linux/pci.h     |  2 ++
 3 files changed, 15 insertions(+), 1 deletion(-)

-- 
2.17.1