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| author |   Mathias Nyman <mathias.nyman@linux.intel.com> | 2023-01-16 16:22:15 +0200 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-17 16:37:24 +0100 |
| commit | cd702d18c882d5a4ea44bbdb38edd5d5577ef640 (patch) | |
| tree | 1f85d916c9e56d6751b58fa60f67f4185f705a5e /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | xhci: Add a flag to disable USB3 lpm on a xhci root port level. (diff) | |
| download | wireguard-linux-cd702d18c882d5a4ea44bbdb38edd5d5577ef640.tar.xz wireguard-linux-cd702d18c882d5a4ea44bbdb38edd5d5577ef640.zip | |
usb: acpi: add helper to check port lpm capability using acpi _DSM
Add a helper to evaluate ACPI usb device specific method (_DSM) provided
in case the USB3 port shouldn't enter U1 and U2 link states.
This _DSM was added as port specific retimer configuration may lead to
exit latencies growing beyond U1/U2 exit limits, and OS needs a way to
find which ports can't support U1/U2 link power management states.
This _DSM is also used by windows:
Link: https://docs.microsoft.com/en-us/windows-hardware/drivers/bringup/usb-device-specific-method---dsm-
Some patch issues found in testing resolved by Ron Lee
Cc: stable@vger.kernel.org
Tested-by: Ron Lee <ron.lee@intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20230116142216.1141605-7-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions