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