drivers/cpufreq/Kconfig.x86

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  57           file has now been superseded by the more generic "boost" entry.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