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 perferred
  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         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
  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 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
  61 config 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
  77 config 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
  89 config 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
 101 config 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
 112 config 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
 119 config 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
 132 config X86_AMD_FREQ_SENSITIVITY
 133         tristate "AMD frequency sensitivity feedback powersave bias"
 134         depends on CPU_FREQ_GOV_ONDEMAND && X86_ACPI_CPUFREQ && CPU_SUP_AMD
 135         help
 136           This adds AMD-specific powersave bias function to the ondemand
 137           governor, which allows it to make more power-conscious frequency
 138           change decisions based on feedback from hardware (availble on AMD
 139           Family 16h and above).
 140
 141           Hardware feedback tells software how "sensitive" to frequency changes
 142           the CPUs' workloads are. CPU-bound workloads will be more sensitive
 143           -- they will perform better as frequency increases. Memory/IO-bound
 144           workloads will be less sensitive -- they will not necessarily perform
 145           better as frequency increases.
 146
 147           If in doubt, say N.
 148
 149 config X86_GX_SUSPMOD
 150         tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
 151         depends on X86_32 && PCI
 152         help
 153          This add the CPUFreq driver for NatSemi Geode processors which
 154          support suspend modulation.
 155
 156          For details, take a look at <file:Documentation/cpu-freq/>.
 157
 158          If in doubt, say N.
 159
 160 config X86_SPEEDSTEP_CENTRINO
 161         tristate "Intel Enhanced SpeedStep (deprecated)"
 162         select CPU_FREQ_TABLE
 163         select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
 164         depends on X86_32 || (X86_64 && ACPI_PROCESSOR)
 165         help
 166           This is deprecated and this functionality is now merged into
 167           acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
 168           speedstep_centrino.
 169           This adds the CPUFreq driver for Enhanced SpeedStep enabled
 170           mobile CPUs.  This means Intel Pentium M (Centrino) CPUs
 171           or 64bit enabled Intel Xeons.
 172
 173           To compile this driver as a module, choose M here: the
 174           module will be called speedstep-centrino.
 175
 176           For details, take a look at <file:Documentation/cpu-freq/>.
 177
 178           If in doubt, say N.
 179
 180 config X86_SPEEDSTEP_CENTRINO_TABLE
 181         bool "Built-in tables for Banias CPUs"
 182         depends on X86_32 && X86_SPEEDSTEP_CENTRINO
 183         default y
 184         help
 185           Use built-in tables for Banias CPUs if ACPI encoding
 186           is not available.
 187
 188           If in doubt, say N.
 189
 190 config X86_SPEEDSTEP_ICH
 191         tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
 192         select CPU_FREQ_TABLE
 193         depends on X86_32
 194         help
 195           This adds the CPUFreq driver for certain mobile Intel Pentium III
 196           (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
 197           mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
 198           ICH3 or ICH4 southbridge.
 199
 200           For details, take a look at <file:Documentation/cpu-freq/>.
 201
 202           If in doubt, say N.
 203
 204 config X86_SPEEDSTEP_SMI
 205         tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
 206         select CPU_FREQ_TABLE
 207         depends on X86_32
 208         help
 209           This adds the CPUFreq driver for certain mobile Intel Pentium III
 210           (Coppermine), all mobile Intel Pentium III-M (Tualatin)
 211           on systems which have an Intel 440BX/ZX/MX southbridge.
 212
 213           For details, take a look at <file:Documentation/cpu-freq/>.
 214
 215           If in doubt, say N.
 216
 217 config X86_P4_CLOCKMOD
 218         tristate "Intel Pentium 4 clock modulation"
 219         select CPU_FREQ_TABLE
 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         select CPU_FREQ_TABLE
 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         select CPU_FREQ_TABLE
 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