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authorAshwin Chaugule <ashwin.chaugule@linaro.org>2015-08-05 09:40:25 -0400
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-08-25 03:25:47 +0200
commit239708a3af44064366f1af0eea02dc1e8991c11b (patch)
tree3660c0e42ac0c18b322239aadba3505b791cb772 /drivers/acpi/Kconfig
parentd3c68f218f927bd4b14b586ea2dcecee54cf09ad (diff)
downloadtalos-obmc-linux-239708a3af44064366f1af0eea02dc1e8991c11b.tar.gz
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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/Kconfig15
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 114cf48085ab..d6e2a869033c 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.
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