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  55           file has now been superseded by the more generic "boost" entry.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