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| author | Changbin Du <changbin.du@gmail.com> | 2019-04-24 19:53:04 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-04-25 23:07:20 +0200 |
| commit | 4887954cac779abe38d3ba6446dec341ccca04ea (patch) | |
| tree | ab9ec6c57324c628188cad0a2911a50fd28ffd43 /Documentation/acpi | |
| parent | Documentation: ACPI: move cppc_sysfs.txt to admin-guide/acpi and convert to reST (diff) | |
| download | linux-4887954cac779abe38d3ba6446dec341ccca04ea.tar.xz linux-4887954cac779abe38d3ba6446dec341ccca04ea.zip | |
Documentation: ACPI: move lpit.txt to firmware-guide/acpi and convert to reST
This converts the plain text documentation to reStructuredText format
and adds it to Sphinx TOC tree.
No essential content change.
Signed-off-by: Changbin Du <changbin.du@gmail.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'Documentation/acpi')
| -rw-r--r-- | Documentation/acpi/lpit.txt | 25 |
1 files changed, 0 insertions, 25 deletions
diff --git a/Documentation/acpi/lpit.txt b/Documentation/acpi/lpit.txt deleted file mode 100644 index b426398d2e97..000000000000 --- a/Documentation/acpi/lpit.txt +++ /dev/null @@ -1,25 +0,0 @@ -To enumerate platform Low Power Idle states, Intel platforms are using -“Low Power Idle Table” (LPIT). More details about this table can be -downloaded from: -http://www.uefi.org/sites/default/files/resources/Intel_ACPI_Low_Power_S0_Idle.pdf - -Residencies for each low power state can be read via FFH -(Function fixed hardware) or a memory mapped interface. - -On platforms supporting S0ix sleep states, there can be two types of -residencies: -- CPU PKG C10 (Read via FFH interface) -- Platform Controller Hub (PCH) SLP_S0 (Read via memory mapped interface) - -The following attributes are added dynamically to the cpuidle -sysfs attribute group: - /sys/devices/system/cpu/cpuidle/low_power_idle_cpu_residency_us - /sys/devices/system/cpu/cpuidle/low_power_idle_system_residency_us - -The "low_power_idle_cpu_residency_us" attribute shows time spent -by the CPU package in PKG C10 - -The "low_power_idle_system_residency_us" attribute shows SLP_S0 -residency, or system time spent with the SLP_S0# signal asserted. -This is the lowest possible system power state, achieved only when CPU is in -PKG C10 and all functional blocks in PCH are in a low power state. |