[PATCH 0/2][SRU][OEM-OSP1-B] pci: Speed up the process of s3 resume

[Koba Ko]

BugLink: https://bugs.launchpad.net/bugs/1876844

[Impact]
Process of s3 resume take 7s and it's too long which is over 5s.

[Fix]
Instead of using the supported speeds to determine whether to wait for 
Link training, check whether the port supports DLL Link Active reporting. 
The ports in question do not, so we'll wait only the 100 ms required for Ports 
that support Link speeds <= 5 GT/s.

This of course assumes these Ports always train the Link within 100 ms even 
if they are operating at > 5 GT/s, which is not required by the spec.

[test]
With the patch, the total time s3 resume is 4454.244 ms which is smaller than 5s.

[Regression Potential]
Low. Follow the PCI spec to check whether the device supports DLL Link Active 
reporting, then choose the time of delay.

Bjorn Helgaas (1):
  PCI/PM: Adjust pcie_wait_for_link_delay() for caller delay

Mika Westerberg (1):
  PCI/PM: Assume ports without DLL Link Active train links in 100 ms

 drivers/pci/pci.c | 34 +++++++++++++++++++++++-----------
 1 file changed, 23 insertions(+), 11 deletions(-)

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2.17.1