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| author | David E. Box <[email protected]> | 2020-12-07 14:39:50 -0800 |
|---|---|---|
| committer | Bjorn Helgaas <[email protected]> | 2020-12-10 14:43:54 -0600 |
| commit | 39850ed51062f89cd46214a16aaafba5ca49fd6c (patch) | |
| tree | b8cb10061b1aecb2eb14001219f1bf8277565354 /tools/perf/scripts/python/exported-sql-viewer.py | |
| parent | f8394f232b1eab649ce2df5c5f15b0e528c92091 (diff) | |
PCI/PTM: Save/restore Precision Time Measurement Capability for suspend/resume
The PCI subsystem does not currently save and restore the configuration
space for the Precision Time Measurement (PTM) Extended Capability leading
to the possibility of the feature returning disabled on S3 resume. This
has been observed on Intel Coffee Lake desktops. Add save/restore of the
PTM control register. This saves the PTM Enable, Root Select, and Effective
Granularity bits.
Suggested-by: Rafael J. Wysocki <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: David E. Box <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/exported-sql-viewer.py')
0 files changed, 0 insertions, 0 deletions