On 17 July 2015 at 20:03, Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> wrote: > 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? True. Will add to the IA64 Kconfig. Thanks, Ashwin. -- 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
