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