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| author | Ashwin Chaugule <ashwin.chaugule@linaro.org> | 2015-08-05 09:40:25 -0400 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-08-25 03:25:47 +0200 |
| commit | 239708a3af44064366f1af0eea02dc1e8991c11b (patch) | |
| tree | 3660c0e42ac0c18b322239aadba3505b791cb772 /drivers/acpi/Kconfig | |
| parent | d3c68f218f927bd4b14b586ea2dcecee54cf09ad (diff) | |
| download | op-kernel-dev-239708a3af44064366f1af0eea02dc1e8991c11b.zip op-kernel-dev-239708a3af44064366f1af0eea02dc1e8991c11b.tar.gz | |
ACPI: Split out ACPI PSS from ACPI Processor driver
The ACPI processor driver is currently tied too closely
to the ACPI P-states (PSS) and other related constructs
for controlling CPU performance.
The newer ACPI specification (v5.1 onwards) introduces
alternative methods to PSS. These new mechanisms are
described within each ACPI Processor object and so they
need to be scanned whenever a new Processor object is detected.
This patch introduces a new Kconfig symbol to allow for
finer configurability among the two options for controlling
performance states. There is no change in functionality and
the option is auto-selected by the architectures which support it.
A future commit will introduce support for CPPC: A newer method of
controlling CPU performance. The OS is not expected to support
CPPC and PSS at the same time, so the Kconfig option lets us make
the two mutually exclusive at compile time.
Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org>
[ rjw: Changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/Kconfig')
| -rw-r--r-- | drivers/acpi/Kconfig | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index 114cf48..d6e2a86 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -189,17 +189,20 @@ config ACPI_DOCK This driver supports ACPI-controlled docking stations and removable drive bays such as the IBM Ultrabay and the Dell Module Bay. +config ACPI_CPU_FREQ_PSS + bool + select THERMAL + config ACPI_PROCESSOR tristate "Processor" - select THERMAL - select CPU_IDLE depends on X86 || IA64 + select CPU_IDLE + select ACPI_CPU_FREQ_PSS default y help - This driver installs ACPI as the idle handler for Linux and uses - ACPI C2 and C3 processor states to save power on systems that - support it. It is required by several flavors of cpufreq - performance-state drivers. + This driver adds support for the ACPI Processor package. It is required + by several flavors of cpufreq performance-state, thermal, throttling and + idle drivers. To compile this driver as a module, choose M here: the module will be called processor. |
