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  56           file has now been superseded by the more generic "boost" entry.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