On Saturday, July 18, 2015 02:01:40 AM Rafael J. Wysocki wrote: > On Thursday, July 09, 2015 02:04:18 PM Ashwin Chaugule wrote: > > 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 architecture Kconfig files. > > > > The following patchwork introduces CPPC: A newer method of > > controlling CPU performance. The OS is not expected to support > > CPPC and PSS at runtime. So the kconfig option lets us make > > these two mutually exclusive at compile time. > > > > Signed-off-by: Ashwin Chaugule <ashwin.chaugule@xxxxxxxxxx> > > --- > > arch/x86/Kconfig | 1 + > > drivers/acpi/Kconfig | 19 ++++++--- > > drivers/acpi/Makefile | 6 +-- > > drivers/acpi/processor_driver.c | 86 +++++++++++++++++++++++++------------ > > drivers/cpufreq/Kconfig | 2 +- > > drivers/cpufreq/Kconfig.x86 | 2 + > > include/acpi/processor.h | 94 +++++++++++++++++++++++++++-------------- > > 7 files changed, 142 insertions(+), 68 deletions(-) > > > > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig > > index 226d569..93d150d 100644 > > --- a/arch/x86/Kconfig > > +++ b/arch/x86/Kconfig > > @@ -143,6 +143,7 @@ config X86 > > select ACPI_LEGACY_TABLES_LOOKUP if ACPI > > select X86_FEATURE_NAMES if PROC_FS > > select SRCU > > + select ACPI_CPU_FREQ_PSS if ACPI Also, does ia64 not use _PSS-based cpufreq? Thanks, Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
