drivers/cpufreq/Kconfig.x86

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 #
   3 # x86 CPU Frequency scaling drivers
   4 #
   5
   6 config X86_INTEL_PSTATE
   7         bool "Intel P state control"
   8         depends on X86
   9         select ACPI_PROCESSOR if ACPI
  10         select ACPI_CPPC_LIB if X86_64 && ACPI && SCHED_MC_PRIO
  11         help
  12           This driver provides a P state for Intel core processors.
  13           The driver implements an internal governor and will become
  14           the scaling driver and governor for Sandy bridge processors.
  15
  16           When this driver is enabled it will become the preferred
  17           scaling driver for Sandy bridge processors.
  18
  19           If in doubt, say N.
  20
  21 config X86_PCC_CPUFREQ
  22         tristate "Processor Clocking Control interface driver"
  23         depends on ACPI && ACPI_PROCESSOR
  24         help
  25           This driver adds support for the PCC interface.
  26
  27           For details, take a look at:
  28           <file:Documentation/cpu-freq/pcc-cpufreq.txt>.
  29
  30           To compile this driver as a module, choose M here: the
  31           module will be called pcc-cpufreq.
  32
  33           If in doubt, say N.
  34
  35 config X86_ACPI_CPUFREQ
  36         tristate "ACPI Processor P-States driver"
  37         depends on ACPI_PROCESSOR
  38         help
  39           This driver adds a CPUFreq driver which utilizes the ACPI
  40           Processor Performance States.
  41           This driver also supports Intel Enhanced Speedstep and newer
  42           AMD CPUs.
  43
  44           To compile this driver as a module, choose M here: the
  45           module will be called acpi-cpufreq.
  46
  47           For details, take a look at <file:Documentation/cpu-freq/>.
  48
  49           If in doubt, say N.
  50
  51 config X86_ACPI_CPUFREQ_CPB
  52         default y
  53         bool "Legacy cpb sysfs knob support for AMD CPUs"
  54         depends on X86_ACPI_CPUFREQ && CPU_SUP_AMD
  55         help
  56           The powernow-k8 driver used to provide a sysfs knob called "cpb"
  57           to disable the Core Performance Boosting feature of AMD CPUs. This
  58           file has now been superseded by the more generic "boost" entry.
  59
  60           By enabling this option the acpi_cpufreq driver provides the old
  61           entry in addition to the new boost ones, for compatibility reasons.
  62
  63 config X86_SFI_CPUFREQ
  64         tristate "SFI Performance-States driver"
  65         depends on X86_INTEL_MID && SFI
  66         help
  67           This adds a CPUFreq driver for some Silvermont based Intel Atom
  68           architectures like Z34xx and Z35xx which enumerate processor
  69           performance states through SFI.
  70
  71           If in doubt, say N.
  72
  73 config ELAN_CPUFREQ
  74         tristate "AMD Elan SC400 and SC410"
  75         depends on MELAN
  76         ---help---
  77           This adds the CPUFreq driver for AMD Elan SC400 and SC410
  78           processors.
  79
  80           You need to specify the processor maximum speed as boot
  81           parameter: elanfreq=maxspeed (in kHz) or as module
  82           parameter "max_freq".
  83
  84           For details, take a look at <file:Documentation/cpu-freq/>.
  85
  86           If in doubt, say N.
  87
  88 config SC520_CPUFREQ
  89         tristate "AMD Elan SC520"
  90         depends on MELAN
  91         ---help---
  92           This adds the CPUFreq driver for AMD Elan SC520 processor.
  93
  94           For details, take a look at <file:Documentation/cpu-freq/>.
  95
  96           If in doubt, say N.
  97
  98
  99 config X86_POWERNOW_K6
 100         tristate "AMD Mobile K6-2/K6-3 PowerNow!"
 101         depends on X86_32
 102         help
 103           This adds the CPUFreq driver for mobile AMD K6-2+ and mobile
 104           AMD K6-3+ processors.
 105
 106           For details, take a look at <file:Documentation/cpu-freq/>.
 107
 108           If in doubt, say N.
 109
 110 config X86_POWERNOW_K7
 111         tristate "AMD Mobile Athlon/Duron PowerNow!"
 112         depends on X86_32
 113         help
 114           This adds the CPUFreq driver for mobile AMD K7 mobile processors.
 115
 116           For details, take a look at <file:Documentation/cpu-freq/>.
 117
 118           If in doubt, say N.
 119
 120 config X86_POWERNOW_K7_ACPI
 121         bool
 122         depends on X86_POWERNOW_K7 && ACPI_PROCESSOR
 123         depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m)
 124         depends on X86_32
 125         default y
 126
 127 config X86_POWERNOW_K8
 128         tristate "AMD Opteron/Athlon64 PowerNow!"
 129         depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ
 130         help
 131           This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors.
 132           Support for K10 and newer processors is now in acpi-cpufreq.
 133
 134           To compile this driver as a module, choose M here: the
 135           module will be called powernow-k8.
 136
 137           For details, take a look at <file:Documentation/cpu-freq/>.
 138
 139 config X86_AMD_FREQ_SENSITIVITY
 140         tristate "AMD frequency sensitivity feedback powersave bias"
 141         depends on CPU_FREQ_GOV_ONDEMAND && X86_ACPI_CPUFREQ && CPU_SUP_AMD
 142         help
 143           This adds AMD-specific powersave bias function to the ondemand
 144           governor, which allows it to make more power-conscious frequency
 145           change decisions based on feedback from hardware (available on AMD
 146           Family 16h and above).
 147
 148           Hardware feedback tells software how "sensitive" to frequency changes
 149           the CPUs' workloads are. CPU-bound workloads will be more sensitive
 150           -- they will perform better as frequency increases. Memory/IO-bound
 151           workloads will be less sensitive -- they will not necessarily perform
 152           better as frequency increases.
 153
 154           If in doubt, say N.
 155
 156 config X86_GX_SUSPMOD
 157         tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
 158         depends on X86_32 && PCI
 159         help
 160          This add the CPUFreq driver for NatSemi Geode processors which
 161          support suspend modulation.
 162
 163          For details, take a look at <file:Documentation/cpu-freq/>.
 164
 165          If in doubt, say N.
 166
 167 config X86_SPEEDSTEP_CENTRINO
 168         tristate "Intel Enhanced SpeedStep (deprecated)"
 169         select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
 170         depends on X86_32 || (X86_64 && ACPI_PROCESSOR)
 171         help
 172           This is deprecated and this functionality is now merged into
 173           acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
 174           speedstep_centrino.
 175           This adds the CPUFreq driver for Enhanced SpeedStep enabled
 176           mobile CPUs.  This means Intel Pentium M (Centrino) CPUs
 177           or 64bit enabled Intel Xeons.
 178
 179           To compile this driver as a module, choose M here: the
 180           module will be called speedstep-centrino.
 181
 182           For details, take a look at <file:Documentation/cpu-freq/>.
 183
 184           If in doubt, say N.
 185
 186 config X86_SPEEDSTEP_CENTRINO_TABLE
 187         bool "Built-in tables for Banias CPUs"
 188         depends on X86_32 && X86_SPEEDSTEP_CENTRINO
 189         default y
 190         help
 191           Use built-in tables for Banias CPUs if ACPI encoding
 192           is not available.
 193
 194           If in doubt, say N.
 195
 196 config X86_SPEEDSTEP_ICH
 197         tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
 198         depends on X86_32
 199         help
 200           This adds the CPUFreq driver for certain mobile Intel Pentium III
 201           (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
 202           mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
 203           ICH3 or ICH4 southbridge.
 204
 205           For details, take a look at <file:Documentation/cpu-freq/>.
 206
 207           If in doubt, say N.
 208
 209 config X86_SPEEDSTEP_SMI
 210         tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
 211         depends on X86_32
 212         help
 213           This adds the CPUFreq driver for certain mobile Intel Pentium III
 214           (Coppermine), all mobile Intel Pentium III-M (Tualatin)
 215           on systems which have an Intel 440BX/ZX/MX southbridge.
 216
 217           For details, take a look at <file:Documentation/cpu-freq/>.
 218
 219           If in doubt, say N.
 220
 221 config X86_P4_CLOCKMOD
 222         tristate "Intel Pentium 4 clock modulation"
 223         help
 224           This adds the CPUFreq driver for Intel Pentium 4 / XEON
 225           processors.  When enabled it will lower CPU temperature by skipping
 226           clocks.
 227
 228           This driver should be only used in exceptional
 229           circumstances when very low power is needed because it causes severe
 230           slowdowns and noticeable latencies.  Normally Speedstep should be used
 231           instead.
 232
 233           To compile this driver as a module, choose M here: the
 234           module will be called p4-clockmod.
 235
 236           For details, take a look at <file:Documentation/cpu-freq/>.
 237
 238           Unless you are absolutely sure say N.
 239
 240 config X86_CPUFREQ_NFORCE2
 241         tristate "nVidia nForce2 FSB changing"
 242         depends on X86_32
 243         help
 244           This adds the CPUFreq driver for FSB changing on nVidia nForce2
 245           platforms.
 246
 247           For details, take a look at <file:Documentation/cpu-freq/>.
 248
 249           If in doubt, say N.
 250
 251 config X86_LONGRUN
 252         tristate "Transmeta LongRun"
 253         depends on X86_32
 254         help
 255           This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors
 256           which support LongRun.
 257
 258           For details, take a look at <file:Documentation/cpu-freq/>.
 259
 260           If in doubt, say N.
 261
 262 config X86_LONGHAUL
 263         tristate "VIA Cyrix III Longhaul"
 264         depends on X86_32 && ACPI_PROCESSOR
 265         help
 266           This adds the CPUFreq driver for VIA Samuel/CyrixIII,
 267           VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
 268           processors.
 269
 270           For details, take a look at <file:Documentation/cpu-freq/>.
 271
 272           If in doubt, say N.
 273
 274 config X86_E_POWERSAVER
 275         tristate "VIA C7 Enhanced PowerSaver (DANGEROUS)"
 276         depends on X86_32 && ACPI_PROCESSOR
 277         help
 278           This adds the CPUFreq driver for VIA C7 processors.  However, this driver
 279           does not have any safeguards to prevent operating the CPU out of spec
 280           and is thus considered dangerous.  Please use the regular ACPI cpufreq
 281           driver, enabled by CONFIG_X86_ACPI_CPUFREQ.
 282
 283           If in doubt, say N.
 284
 285 comment "shared options"
 286
 287 config X86_SPEEDSTEP_LIB
 288         tristate
 289         default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD)
 290
 291 config X86_SPEEDSTEP_RELAXED_CAP_CHECK
 292         bool "Relaxed speedstep capability checks"
 293         depends on X86_32 && (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH)
 294         help
 295           Don't perform all checks for a speedstep capable system which would
 296           normally be done. Some ancient or strange systems, though speedstep
 297           capable, don't always indicate that they are speedstep capable. This
 298           option lets the probing code bypass some of those checks if the
 299           parameter "relaxed_check=1" is passed to the module.
 300