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         select CPU_FREQ_TABLE
 136         help
 137           This adds AMD-specific powersave bias function to the ondemand
 138           governor, which allows it to make more power-conscious frequency
 139           change decisions based on feedback from hardware (availble on AMD
 140           Family 16h and above).
 141
 142           Hardware feedback tells software how "sensitive" to frequency changes
 143           the CPUs' workloads are. CPU-bound workloads will be more sensitive
 144           -- they will perform better as frequency increases. Memory/IO-bound
 145           workloads will be less sensitive -- they will not necessarily perform
 146           better as frequency increases.
 147
 148           If in doubt, say N.
 149
 150 config X86_GX_SUSPMOD
 151         tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
 152         depends on X86_32 && PCI
 153         help
 154          This add the CPUFreq driver for NatSemi Geode processors which
 155          support suspend modulation.
 156
 157          For details, take a look at <file:Documentation/cpu-freq/>.
 158
 159          If in doubt, say N.
 160
 161 config X86_SPEEDSTEP_CENTRINO
 162         tristate "Intel Enhanced SpeedStep (deprecated)"
 163         select CPU_FREQ_TABLE
 164         select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
 165         depends on X86_32 || (X86_64 && ACPI_PROCESSOR)
 166         help
 167           This is deprecated and this functionality is now merged into
 168           acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
 169           speedstep_centrino.
 170           This adds the CPUFreq driver for Enhanced SpeedStep enabled
 171           mobile CPUs.  This means Intel Pentium M (Centrino) CPUs
 172           or 64bit enabled Intel Xeons.
 173
 174           To compile this driver as a module, choose M here: the
 175           module will be called speedstep-centrino.
 176
 177           For details, take a look at <file:Documentation/cpu-freq/>.
 178
 179           If in doubt, say N.
 180
 181 config X86_SPEEDSTEP_CENTRINO_TABLE
 182         bool "Built-in tables for Banias CPUs"
 183         depends on X86_32 && X86_SPEEDSTEP_CENTRINO
 184         default y
 185         help
 186           Use built-in tables for Banias CPUs if ACPI encoding
 187           is not available.
 188
 189           If in doubt, say N.
 190
 191 config X86_SPEEDSTEP_ICH
 192         tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
 193         select CPU_FREQ_TABLE
 194         depends on X86_32
 195         help
 196           This adds the CPUFreq driver for certain mobile Intel Pentium III
 197           (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
 198           mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
 199           ICH3 or ICH4 southbridge.
 200
 201           For details, take a look at <file:Documentation/cpu-freq/>.
 202
 203           If in doubt, say N.
 204
 205 config X86_SPEEDSTEP_SMI
 206         tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
 207         select CPU_FREQ_TABLE
 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         select CPU_FREQ_TABLE
 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         select CPU_FREQ_TABLE
 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         select CPU_FREQ_TABLE
 276         depends on X86_32 && ACPI_PROCESSOR
 277         help
 278           This adds the CPUFreq driver for VIA C7 processors.  However, this driver
 279           does not have any safeguards to prevent operating the CPU out of spec
 280           and is thus considered dangerous.  Please use the regular ACPI cpufreq
 281           driver, enabled by CONFIG_X86_ACPI_CPUFREQ.
 282
 283           If in doubt, say N.
 284
 285 comment "shared options"
 286
 287 config X86_SPEEDSTEP_LIB
 288         tristate
 289         default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD)
 290
 291 config X86_SPEEDSTEP_RELAXED_CAP_CHECK
 292         bool "Relaxed speedstep capability checks"
 293         depends on X86_32 && (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH)
 294         help
 295           Don't perform all checks for a speedstep capable system which would
 296           normally be done. Some ancient or strange systems, though speedstep
 297           capable, don't always indicate that they are speedstep capable. This
 298           option lets the probing code bypass some of those checks if the
 299           parameter "relaxed_check=1" is passed to the module.
 300