| # | |
| # x86 CPU Frequency scaling drivers | |
| # | |
| config X86_INTEL_PSTATE | |
| bool "Intel P state control" | |
| depends on X86 | |
| select ACPI_PROCESSOR if ACPI | |
| help | |
| This driver provides a P state for Intel core processors. | |
| The driver implements an internal governor and will become | |
| the scaling driver and governor for Sandy bridge processors. | |
| When this driver is enabled it will become the preferred | |
| scaling driver for Sandy bridge processors. | |
| If in doubt, say N. | |
| config X86_PCC_CPUFREQ | |
| tristate "Processor Clocking Control interface driver" | |
| depends on ACPI && ACPI_PROCESSOR | |
| help | |
| This driver adds support for the PCC interface. | |
| For details, take a look at: | |
| <file:Documentation/cpu-freq/pcc-cpufreq.txt>. | |
| To compile this driver as a module, choose M here: the | |
| module will be called pcc-cpufreq. | |
| If in doubt, say N. | |
| config X86_ACPI_CPUFREQ | |
| tristate "ACPI Processor P-States driver" | |
| depends on ACPI_PROCESSOR | |
| help | |
| This driver adds a CPUFreq driver which utilizes the ACPI | |
| Processor Performance States. | |
| This driver also supports Intel Enhanced Speedstep and newer | |
| AMD CPUs. | |
| To compile this driver as a module, choose M here: the | |
| module will be called acpi-cpufreq. | |
| For details, take a look at <file:Documentation/cpu-freq/>. | |
| If in doubt, say N. | |
| config X86_ACPI_CPUFREQ_CPB | |
| default y | |
| bool "Legacy cpb sysfs knob support for AMD CPUs" | |
| depends on X86_ACPI_CPUFREQ && CPU_SUP_AMD | |
| help | |
| The powernow-k8 driver used to provide a sysfs knob called "cpb" | |
| to disable the Core Performance Boosting feature of AMD CPUs. This | |
| file has now been superseded by the more generic "boost" entry. | |
| By enabling this option the acpi_cpufreq driver provides the old | |
| entry in addition to the new boost ones, for compatibility reasons. | |
| config X86_SFI_CPUFREQ | |
| tristate "SFI Performance-States driver" | |
| depends on X86_INTEL_MID && SFI | |
| help | |
| This adds a CPUFreq driver for some Silvermont based Intel Atom | |
| architectures like Z34xx and Z35xx which enumerate processor | |
| performance states through SFI. | |
| If in doubt, say N. | |
| config ELAN_CPUFREQ | |
| tristate "AMD Elan SC400 and SC410" | |
| depends on MELAN | |
| ---help--- | |
| This adds the CPUFreq driver for AMD Elan SC400 and SC410 | |
| processors. | |
| You need to specify the processor maximum speed as boot | |
| parameter: elanfreq=maxspeed (in kHz) or as module | |
| parameter "max_freq". | |
| For details, take a look at <file:Documentation/cpu-freq/>. | |
| If in doubt, say N. | |
| config SC520_CPUFREQ | |
| tristate "AMD Elan SC520" | |
| depends on MELAN | |
| ---help--- | |
| This adds the CPUFreq driver for AMD Elan SC520 processor. | |
| For details, take a look at <file:Documentation/cpu-freq/>. | |
| If in doubt, say N. | |
| config X86_POWERNOW_K6 | |
| tristate "AMD Mobile K6-2/K6-3 PowerNow!" | |
| depends on X86_32 | |
| help | |
| This adds the CPUFreq driver for mobile AMD K6-2+ and mobile | |
| AMD K6-3+ processors. | |
| For details, take a look at <file:Documentation/cpu-freq/>. | |
| If in doubt, say N. | |
| config X86_POWERNOW_K7 | |
| tristate "AMD Mobile Athlon/Duron PowerNow!" | |
| depends on X86_32 | |
| help | |
| This adds the CPUFreq driver for mobile AMD K7 mobile processors. | |
| For details, take a look at <file:Documentation/cpu-freq/>. | |
| If in doubt, say N. | |
| config X86_POWERNOW_K7_ACPI | |
| bool | |
| depends on X86_POWERNOW_K7 && ACPI_PROCESSOR | |
| depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m) | |
| depends on X86_32 | |
| default y | |
| config X86_POWERNOW_K8 | |
| tristate "AMD Opteron/Athlon64 PowerNow!" | |
| depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ | |
| help | |
| This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors. | |
| Support for K10 and newer processors is now in acpi-cpufreq. | |
| To compile this driver as a module, choose M here: the | |
| module will be called powernow-k8. | |
| For details, take a look at <file:Documentation/cpu-freq/>. | |
| config X86_AMD_FREQ_SENSITIVITY | |
| tristate "AMD frequency sensitivity feedback powersave bias" | |
| depends on CPU_FREQ_GOV_ONDEMAND && X86_ACPI_CPUFREQ && CPU_SUP_AMD | |
| help | |
| This adds AMD-specific powersave bias function to the ondemand | |
| governor, which allows it to make more power-conscious frequency | |
| change decisions based on feedback from hardware (available on AMD | |
| Family 16h and above). | |
| Hardware feedback tells software how "sensitive" to frequency changes | |
| the CPUs' workloads are. CPU-bound workloads will be more sensitive | |
| -- they will perform better as frequency increases. Memory/IO-bound | |
| workloads will be less sensitive -- they will not necessarily perform | |
| better as frequency increases. | |
| If in doubt, say N. | |
| config X86_GX_SUSPMOD | |
| tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation" | |
| depends on X86_32 && PCI | |
| help | |
| This add the CPUFreq driver for NatSemi Geode processors which | |
| support suspend modulation. | |
| For details, take a look at <file:Documentation/cpu-freq/>. | |
| If in doubt, say N. | |
| config X86_SPEEDSTEP_CENTRINO | |
| tristate "Intel Enhanced SpeedStep (deprecated)" | |
| select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32 | |
| depends on X86_32 || (X86_64 && ACPI_PROCESSOR) | |
| help | |
| This is deprecated and this functionality is now merged into | |
| acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of | |
| speedstep_centrino. | |
| This adds the CPUFreq driver for Enhanced SpeedStep enabled | |
| mobile CPUs. This means Intel Pentium M (Centrino) CPUs | |
| or 64bit enabled Intel Xeons. | |
| To compile this driver as a module, choose M here: the | |
| module will be called speedstep-centrino. | |
| For details, take a look at <file:Documentation/cpu-freq/>. | |
| If in doubt, say N. | |
| config X86_SPEEDSTEP_CENTRINO_TABLE | |
| bool "Built-in tables for Banias CPUs" | |
| depends on X86_32 && X86_SPEEDSTEP_CENTRINO | |
| default y | |
| help | |
| Use built-in tables for Banias CPUs if ACPI encoding | |
| is not available. | |
| If in doubt, say N. | |
| config X86_SPEEDSTEP_ICH | |
| tristate "Intel Speedstep on ICH-M chipsets (ioport interface)" | |
| depends on X86_32 | |
| help | |
| This adds the CPUFreq driver for certain mobile Intel Pentium III | |
| (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all | |
| mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2, | |
| ICH3 or ICH4 southbridge. | |
| For details, take a look at <file:Documentation/cpu-freq/>. | |
| If in doubt, say N. | |
| config X86_SPEEDSTEP_SMI | |
| tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)" | |
| depends on X86_32 | |
| help | |
| This adds the CPUFreq driver for certain mobile Intel Pentium III | |
| (Coppermine), all mobile Intel Pentium III-M (Tualatin) | |
| on systems which have an Intel 440BX/ZX/MX southbridge. | |
| For details, take a look at <file:Documentation/cpu-freq/>. | |
| If in doubt, say N. | |
| config X86_P4_CLOCKMOD | |
| tristate "Intel Pentium 4 clock modulation" | |
| help | |
| This adds the CPUFreq driver for Intel Pentium 4 / XEON | |
| processors. When enabled it will lower CPU temperature by skipping | |
| clocks. | |
| This driver should be only used in exceptional | |
| circumstances when very low power is needed because it causes severe | |
| slowdowns and noticeable latencies. Normally Speedstep should be used | |
| instead. | |
| To compile this driver as a module, choose M here: the | |
| module will be called p4-clockmod. | |
| For details, take a look at <file:Documentation/cpu-freq/>. | |
| Unless you are absolutely sure say N. | |
| config X86_CPUFREQ_NFORCE2 | |
| tristate "nVidia nForce2 FSB changing" | |
| depends on X86_32 | |
| help | |
| This adds the CPUFreq driver for FSB changing on nVidia nForce2 | |
| platforms. | |
| For details, take a look at <file:Documentation/cpu-freq/>. | |
| If in doubt, say N. | |
| config X86_LONGRUN | |
| tristate "Transmeta LongRun" | |
| depends on X86_32 | |
| help | |
| This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors | |
| which support LongRun. | |
| For details, take a look at <file:Documentation/cpu-freq/>. | |
| If in doubt, say N. | |
| config X86_LONGHAUL | |
| tristate "VIA Cyrix III Longhaul" | |
| depends on X86_32 && ACPI_PROCESSOR | |
| help | |
| This adds the CPUFreq driver for VIA Samuel/CyrixIII, | |
| VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T | |
| processors. | |
| For details, take a look at <file:Documentation/cpu-freq/>. | |
| If in doubt, say N. | |
| config X86_E_POWERSAVER | |
| tristate "VIA C7 Enhanced PowerSaver (DANGEROUS)" | |
| depends on X86_32 && ACPI_PROCESSOR | |
| help | |
| This adds the CPUFreq driver for VIA C7 processors. However, this driver | |
| does not have any safeguards to prevent operating the CPU out of spec | |
| and is thus considered dangerous. Please use the regular ACPI cpufreq | |
| driver, enabled by CONFIG_X86_ACPI_CPUFREQ. | |
| If in doubt, say N. | |
| comment "shared options" | |
| config X86_SPEEDSTEP_LIB | |
| tristate | |
| default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD) | |
| config X86_SPEEDSTEP_RELAXED_CAP_CHECK | |
| bool "Relaxed speedstep capability checks" | |
| depends on X86_32 && (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH) | |
| help | |
| Don't perform all checks for a speedstep capable system which would | |
| normally be done. Some ancient or strange systems, though speedstep | |
| capable, don't always indicate that they are speedstep capable. This | |
| option lets the probing code bypass some of those checks if the | |
| parameter "relaxed_check=1" is passed to the module. | |