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_GX_SUSPMOD
 133         tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
 134         depends on X86_32 && PCI
 135         help
 136          This add the CPUFreq driver for NatSemi Geode processors which
 137          support suspend modulation.
 138
 139          For details, take a look at <file:Documentation/cpu-freq/>.
 140
 141          If in doubt, say N.
 142
 143 config X86_SPEEDSTEP_CENTRINO
 144         tristate "Intel Enhanced SpeedStep (deprecated)"
 145         select CPU_FREQ_TABLE
 146         select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
 147         depends on X86_32 || (X86_64 && ACPI_PROCESSOR)
 148         help
 149           This is deprecated and this functionality is now merged into
 150           acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
 151           speedstep_centrino.
 152           This adds the CPUFreq driver for Enhanced SpeedStep enabled
 153           mobile CPUs.  This means Intel Pentium M (Centrino) CPUs
 154           or 64bit enabled Intel Xeons.
 155
 156           To compile this driver as a module, choose M here: the
 157           module will be called speedstep-centrino.
 158
 159           For details, take a look at <file:Documentation/cpu-freq/>.
 160
 161           If in doubt, say N.
 162
 163 config X86_SPEEDSTEP_CENTRINO_TABLE
 164         bool "Built-in tables for Banias CPUs"
 165         depends on X86_32 && X86_SPEEDSTEP_CENTRINO
 166         default y
 167         help
 168           Use built-in tables for Banias CPUs if ACPI encoding
 169           is not available.
 170
 171           If in doubt, say N.
 172
 173 config X86_SPEEDSTEP_ICH
 174         tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
 175         select CPU_FREQ_TABLE
 176         depends on X86_32
 177         help
 178           This adds the CPUFreq driver for certain mobile Intel Pentium III
 179           (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
 180           mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
 181           ICH3 or ICH4 southbridge.
 182
 183           For details, take a look at <file:Documentation/cpu-freq/>.
 184
 185           If in doubt, say N.
 186
 187 config X86_SPEEDSTEP_SMI
 188         tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
 189         select CPU_FREQ_TABLE
 190         depends on X86_32
 191         help
 192           This adds the CPUFreq driver for certain mobile Intel Pentium III
 193           (Coppermine), all mobile Intel Pentium III-M (Tualatin)
 194           on systems which have an Intel 440BX/ZX/MX southbridge.
 195
 196           For details, take a look at <file:Documentation/cpu-freq/>.
 197
 198           If in doubt, say N.
 199
 200 config X86_P4_CLOCKMOD
 201         tristate "Intel Pentium 4 clock modulation"
 202         select CPU_FREQ_TABLE
 203         help
 204           This adds the CPUFreq driver for Intel Pentium 4 / XEON
 205           processors.  When enabled it will lower CPU temperature by skipping
 206           clocks.
 207
 208           This driver should be only used in exceptional
 209           circumstances when very low power is needed because it causes severe
 210           slowdowns and noticeable latencies.  Normally Speedstep should be used
 211           instead.
 212
 213           To compile this driver as a module, choose M here: the
 214           module will be called p4-clockmod.
 215
 216           For details, take a look at <file:Documentation/cpu-freq/>.
 217
 218           Unless you are absolutely sure say N.
 219
 220 config X86_CPUFREQ_NFORCE2
 221         tristate "nVidia nForce2 FSB changing"
 222         depends on X86_32
 223         help
 224           This adds the CPUFreq driver for FSB changing on nVidia nForce2
 225           platforms.
 226
 227           For details, take a look at <file:Documentation/cpu-freq/>.
 228
 229           If in doubt, say N.
 230
 231 config X86_LONGRUN
 232         tristate "Transmeta LongRun"
 233         depends on X86_32
 234         help
 235           This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors
 236           which support LongRun.
 237
 238           For details, take a look at <file:Documentation/cpu-freq/>.
 239
 240           If in doubt, say N.
 241
 242 config X86_LONGHAUL
 243         tristate "VIA Cyrix III Longhaul"
 244         select CPU_FREQ_TABLE
 245         depends on X86_32 && ACPI_PROCESSOR
 246         help
 247           This adds the CPUFreq driver for VIA Samuel/CyrixIII,
 248           VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
 249           processors.
 250
 251           For details, take a look at <file:Documentation/cpu-freq/>.
 252
 253           If in doubt, say N.
 254
 255 config X86_E_POWERSAVER
 256         tristate "VIA C7 Enhanced PowerSaver (DANGEROUS)"
 257         select CPU_FREQ_TABLE
 258         depends on X86_32
 259         help
 260           This adds the CPUFreq driver for VIA C7 processors.  However, this driver
 261           does not have any safeguards to prevent operating the CPU out of spec
 262           and is thus considered dangerous.  Please use the regular ACPI cpufreq
 263           driver, enabled by CONFIG_X86_ACPI_CPUFREQ.
 264
 265           If in doubt, say N.
 266
 267 comment "shared options"
 268
 269 config X86_SPEEDSTEP_LIB
 270         tristate
 271         default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD)
 272
 273 config X86_SPEEDSTEP_RELAXED_CAP_CHECK
 274         bool "Relaxed speedstep capability checks"
 275         depends on X86_32 && (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH)
 276         help
 277           Don't perform all checks for a speedstep capable system which would
 278           normally be done. Some ancient or strange systems, though speedstep
 279           capable, don't always indicate that they are speedstep capable. This
 280           option lets the probing code bypass some of those checks if the
 281           parameter "relaxed_check=1" is passed to the module.
 282