** Changed in: linux-oem-5.6 (Ubuntu Focal)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1876844
Title:
Speed up the process of s3 resume
Status in HWE Next:
New
Status in linux package in Ubuntu:
Invalid
Status in linux-oem-5.6 package in Ubuntu:
New
Status in linux-oem-osp1 package in Ubuntu:
Invalid
Status in linux source package in Bionic:
In Progress
Status in linux-oem-5.6 source package in Bionic:
Invalid
Status in linux-oem-osp1 source package in Bionic:
Fix Released
Status in linux source package in Focal:
New
Status in linux-oem-5.6 source package in Focal:
Fix Committed
Status in linux-oem-osp1 source package in Focal:
Invalid
Bug description:
[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.
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