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_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
 149config 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
 160config 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
 180config 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
 190config 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
 204config 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
 217config 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
 237config 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
 248config 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
 259config 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
 272config 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
 284comment "shared options"
 285
 286config X86_SPEEDSTEP_LIB
 287        tristate
 288        default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD)
 289
 290config 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
 300
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