diff options
| author | Paul Mackerras <paulus@ozlabs.org> | 2018-01-19 02:09:57 +0100 |
|---|---|---|
| committer | Paul Mackerras <paulus@ozlabs.org> | 2018-01-19 02:09:57 +0100 |
| commit | d27998185da8fbdc35911307ae13518d168778d7 (patch) | |
| tree | 4c5a99fd7cff7c9da1f858fdfccf8dc1cc6c597b /Documentation/admin-guide/thunderbolt.rst | |
| parent | KVM: PPC: Book3S HV: Allow HPT and radix on the same core for POWER9 v2.2 (diff) | |
| parent | KVM: PPC: Book3S HV: Improve handling of debug-trigger HMIs on POWER9 (diff) | |
| download | linux-d27998185da8fbdc35911307ae13518d168778d7.tar.xz linux-d27998185da8fbdc35911307ae13518d168778d7.zip | |
Merge remote-tracking branch 'remotes/powerpc/topic/ppc-kvm' into kvm-ppc-next
This merges in the ppc-kvm topic branch of the powerpc tree to get
two patches which are prerequisites for the following patch series,
plus another patch which touches both powerpc and KVM code.
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Diffstat (limited to 'Documentation/admin-guide/thunderbolt.rst')
| -rw-r--r-- | Documentation/admin-guide/thunderbolt.rst | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/Documentation/admin-guide/thunderbolt.rst b/Documentation/admin-guide/thunderbolt.rst index 5c62d11d77e8..de50a8561774 100644 --- a/Documentation/admin-guide/thunderbolt.rst +++ b/Documentation/admin-guide/thunderbolt.rst @@ -221,3 +221,18 @@ The driver will create one virtual ethernet interface per Thunderbolt port which are named like ``thunderbolt0`` and so on. From this point you can either use standard userspace tools like ``ifconfig`` to configure the interface or let your GUI to handle it automatically. + +Forcing power +------------- +Many OEMs include a method that can be used to force the power of a +thunderbolt controller to an "On" state even if nothing is connected. +If supported by your machine this will be exposed by the WMI bus with +a sysfs attribute called "force_power". + +For example the intel-wmi-thunderbolt driver exposes this attribute in: + /sys/devices/platform/PNP0C14:00/wmi_bus/wmi_bus-PNP0C14:00/86CCFD48-205E-4A77-9C48-2021CBEDE341/force_power + + To force the power to on, write 1 to this attribute file. + To disable force power, write 0 to this attribute file. + +Note: it's currently not possible to query the force power state of a platform. |