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292 lines
8.8 KiB
292 lines
8.8 KiB
# SPDX-License-Identifier: GPL-2.0-only |
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# |
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# x86 CPU Frequency scaling drivers |
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# |
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config X86_INTEL_PSTATE |
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bool "Intel P state control" |
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depends on X86 |
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select ACPI_PROCESSOR if ACPI |
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select ACPI_CPPC_LIB if X86_64 && ACPI && SCHED_MC_PRIO |
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select CPU_FREQ_GOV_PERFORMANCE |
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select CPU_FREQ_GOV_SCHEDUTIL if SMP |
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help |
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This driver provides a P state for Intel core processors. |
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The driver implements an internal governor and will become |
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the scaling driver and governor for Sandy bridge processors. |
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When this driver is enabled it will become the preferred |
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scaling driver for Sandy bridge processors. |
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If in doubt, say N. |
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config X86_PCC_CPUFREQ |
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tristate "Processor Clocking Control interface driver" |
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depends on ACPI && ACPI_PROCESSOR |
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help |
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This driver adds support for the PCC interface. |
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For details, take a look at: |
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<file:Documentation/admin-guide/pm/cpufreq_drivers.rst>. |
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To compile this driver as a module, choose M here: the |
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module will be called pcc-cpufreq. |
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If in doubt, say N. |
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config X86_ACPI_CPUFREQ |
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tristate "ACPI Processor P-States driver" |
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depends on ACPI_PROCESSOR |
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help |
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This driver adds a CPUFreq driver which utilizes the ACPI |
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Processor Performance States. |
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This driver also supports Intel Enhanced Speedstep and newer |
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AMD CPUs. |
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To compile this driver as a module, choose M here: the |
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module will be called acpi-cpufreq. |
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For details, take a look at <file:Documentation/cpu-freq/>. |
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If in doubt, say N. |
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config X86_ACPI_CPUFREQ_CPB |
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default y |
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bool "Legacy cpb sysfs knob support for AMD CPUs" |
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depends on X86_ACPI_CPUFREQ && CPU_SUP_AMD |
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help |
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The powernow-k8 driver used to provide a sysfs knob called "cpb" |
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to disable the Core Performance Boosting feature of AMD CPUs. This |
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file has now been superseded by the more generic "boost" entry. |
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By enabling this option the acpi_cpufreq driver provides the old |
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entry in addition to the new boost ones, for compatibility reasons. |
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config ELAN_CPUFREQ |
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tristate "AMD Elan SC400 and SC410" |
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depends on MELAN |
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help |
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This adds the CPUFreq driver for AMD Elan SC400 and SC410 |
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processors. |
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You need to specify the processor maximum speed as boot |
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parameter: elanfreq=maxspeed (in kHz) or as module |
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parameter "max_freq". |
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For details, take a look at <file:Documentation/cpu-freq/>. |
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If in doubt, say N. |
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config SC520_CPUFREQ |
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tristate "AMD Elan SC520" |
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depends on MELAN |
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help |
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This adds the CPUFreq driver for AMD Elan SC520 processor. |
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For details, take a look at <file:Documentation/cpu-freq/>. |
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If in doubt, say N. |
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config X86_POWERNOW_K6 |
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tristate "AMD Mobile K6-2/K6-3 PowerNow!" |
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depends on X86_32 |
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help |
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This adds the CPUFreq driver for mobile AMD K6-2+ and mobile |
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AMD K6-3+ processors. |
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For details, take a look at <file:Documentation/cpu-freq/>. |
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If in doubt, say N. |
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config X86_POWERNOW_K7 |
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tristate "AMD Mobile Athlon/Duron PowerNow!" |
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depends on X86_32 |
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help |
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This adds the CPUFreq driver for mobile AMD K7 mobile processors. |
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For details, take a look at <file:Documentation/cpu-freq/>. |
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If in doubt, say N. |
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config X86_POWERNOW_K7_ACPI |
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bool |
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depends on X86_POWERNOW_K7 && ACPI_PROCESSOR |
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depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m) |
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depends on X86_32 |
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default y |
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config X86_POWERNOW_K8 |
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tristate "AMD Opteron/Athlon64 PowerNow!" |
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depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ |
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help |
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This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors. |
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Support for K10 and newer processors is now in acpi-cpufreq. |
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To compile this driver as a module, choose M here: the |
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module will be called powernow-k8. |
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For details, take a look at <file:Documentation/cpu-freq/>. |
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config X86_AMD_FREQ_SENSITIVITY |
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tristate "AMD frequency sensitivity feedback powersave bias" |
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depends on CPU_FREQ_GOV_ONDEMAND && X86_ACPI_CPUFREQ && CPU_SUP_AMD |
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help |
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This adds AMD-specific powersave bias function to the ondemand |
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governor, which allows it to make more power-conscious frequency |
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change decisions based on feedback from hardware (available on AMD |
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Family 16h and above). |
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Hardware feedback tells software how "sensitive" to frequency changes |
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the CPUs' workloads are. CPU-bound workloads will be more sensitive |
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-- they will perform better as frequency increases. Memory/IO-bound |
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workloads will be less sensitive -- they will not necessarily perform |
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better as frequency increases. |
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If in doubt, say N. |
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config X86_GX_SUSPMOD |
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tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation" |
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depends on X86_32 && PCI |
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help |
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This add the CPUFreq driver for NatSemi Geode processors which |
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support suspend modulation. |
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For details, take a look at <file:Documentation/cpu-freq/>. |
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If in doubt, say N. |
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config X86_SPEEDSTEP_CENTRINO |
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tristate "Intel Enhanced SpeedStep (deprecated)" |
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select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32 |
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depends on X86_32 || (X86_64 && ACPI_PROCESSOR) |
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help |
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This is deprecated and this functionality is now merged into |
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acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of |
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speedstep_centrino. |
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This adds the CPUFreq driver for Enhanced SpeedStep enabled |
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mobile CPUs. This means Intel Pentium M (Centrino) CPUs |
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or 64bit enabled Intel Xeons. |
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To compile this driver as a module, choose M here: the |
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module will be called speedstep-centrino. |
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For details, take a look at <file:Documentation/cpu-freq/>. |
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If in doubt, say N. |
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config X86_SPEEDSTEP_CENTRINO_TABLE |
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bool "Built-in tables for Banias CPUs" |
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depends on X86_32 && X86_SPEEDSTEP_CENTRINO |
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default y |
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help |
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Use built-in tables for Banias CPUs if ACPI encoding |
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is not available. |
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If in doubt, say N. |
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config X86_SPEEDSTEP_ICH |
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tristate "Intel Speedstep on ICH-M chipsets (ioport interface)" |
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depends on X86_32 |
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help |
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This adds the CPUFreq driver for certain mobile Intel Pentium III |
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(Coppermine), all mobile Intel Pentium III-M (Tualatin) and all |
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mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2, |
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ICH3 or ICH4 southbridge. |
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For details, take a look at <file:Documentation/cpu-freq/>. |
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If in doubt, say N. |
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config X86_SPEEDSTEP_SMI |
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tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)" |
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depends on X86_32 |
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help |
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This adds the CPUFreq driver for certain mobile Intel Pentium III |
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(Coppermine), all mobile Intel Pentium III-M (Tualatin) |
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on systems which have an Intel 440BX/ZX/MX southbridge. |
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For details, take a look at <file:Documentation/cpu-freq/>. |
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If in doubt, say N. |
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config X86_P4_CLOCKMOD |
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tristate "Intel Pentium 4 clock modulation" |
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help |
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This adds the CPUFreq driver for Intel Pentium 4 / XEON |
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processors. When enabled it will lower CPU temperature by skipping |
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clocks. |
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This driver should be only used in exceptional |
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circumstances when very low power is needed because it causes severe |
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slowdowns and noticeable latencies. Normally Speedstep should be used |
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instead. |
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To compile this driver as a module, choose M here: the |
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module will be called p4-clockmod. |
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For details, take a look at <file:Documentation/cpu-freq/>. |
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Unless you are absolutely sure say N. |
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config X86_CPUFREQ_NFORCE2 |
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tristate "nVidia nForce2 FSB changing" |
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depends on X86_32 |
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help |
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This adds the CPUFreq driver for FSB changing on nVidia nForce2 |
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platforms. |
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For details, take a look at <file:Documentation/cpu-freq/>. |
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If in doubt, say N. |
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config X86_LONGRUN |
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tristate "Transmeta LongRun" |
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depends on X86_32 |
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help |
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This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors |
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which support LongRun. |
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For details, take a look at <file:Documentation/cpu-freq/>. |
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If in doubt, say N. |
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config X86_LONGHAUL |
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tristate "VIA Cyrix III Longhaul" |
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depends on X86_32 && ACPI_PROCESSOR |
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help |
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This adds the CPUFreq driver for VIA Samuel/CyrixIII, |
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VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T |
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processors. |
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For details, take a look at <file:Documentation/cpu-freq/>. |
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If in doubt, say N. |
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config X86_E_POWERSAVER |
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tristate "VIA C7 Enhanced PowerSaver (DANGEROUS)" |
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depends on X86_32 && ACPI_PROCESSOR |
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help |
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This adds the CPUFreq driver for VIA C7 processors. However, this driver |
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does not have any safeguards to prevent operating the CPU out of spec |
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and is thus considered dangerous. Please use the regular ACPI cpufreq |
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driver, enabled by CONFIG_X86_ACPI_CPUFREQ. |
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If in doubt, say N. |
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comment "shared options" |
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config X86_SPEEDSTEP_LIB |
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tristate |
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default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD) |
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config X86_SPEEDSTEP_RELAXED_CAP_CHECK |
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bool "Relaxed speedstep capability checks" |
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depends on X86_32 && (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH) |
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help |
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Don't perform all checks for a speedstep capable system which would |
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normally be done. Some ancient or strange systems, though speedstep |
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capable, don't always indicate that they are speedstep capable. This |
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option lets the probing code bypass some of those checks if the |
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parameter "relaxed_check=1" is passed to the module. |
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