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Current implementations of Intel Thunderbolt controllers will go into a low power mode when not in use. Many machines containing these controllers also have a GPIO wired up that can force the controller awake. This is offered via a ACPI-WMI interface intended to be manipulated by a userspace utility. This mechanism is provided by Intel to OEMs to include in BIOS. It uses an industry wide GUID that is populated in a separate _WDG entry with no binary MOF. This interface allows software such as fwupd to wake up thunderbolt controllers to query the firmware version or flash new firmware. Signed-off-by: Mario Limonciello <mario.limonciello@dell.com> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com> Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com> Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org> [andy fixed merge conflicts and bump kernel version for ABI] Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
12 lines
408 B
Plaintext
12 lines
408 B
Plaintext
What: /sys/devices/platform/<platform>/force_power
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Date: September 2017
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KernelVersion: 4.15
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Contact: "Mario Limonciello" <mario.limonciello@dell.com>
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Description:
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Modify the platform force power state, influencing
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Thunderbolt controllers to turn on or off when no
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devices are connected (write-only)
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There are two available states:
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* 0 -> Force power disabled
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* 1 -> Force power enabled
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