drivers/cpufreq/Kconfig

   1 menu "CPU Frequency scaling"
   2
   3 config CPU_FREQ
   4         bool "CPU Frequency scaling"
   5         select SRCU
   6         help
   7           CPU Frequency scaling allows you to change the clock speed of
   8           CPUs on the fly. This is a nice method to save power, because
   9           the lower the CPU clock speed, the less power the CPU consumes.
  10
  11           Note that this driver doesn't automatically change the CPU
  12           clock speed, you need to either enable a dynamic cpufreq governor
  13           (see below) after boot, or use a userspace tool.
  14
  15           For details, take a look at <file:Documentation/cpu-freq>.
  16
  17           If in doubt, say N.
  18
  19 if CPU_FREQ
  20
  21 config CPU_FREQ_GOV_ATTR_SET
  22         bool
  23
  24 config CPU_FREQ_GOV_COMMON
  25         select CPU_FREQ_GOV_ATTR_SET
  26         select IRQ_WORK
  27         bool
  28
  29 config CPU_FREQ_BOOST_SW
  30         bool
  31         depends on THERMAL
  32
  33 config CPU_FREQ_STAT
  34         bool "CPU frequency transition statistics"
  35         help
  36           Export CPU frequency statistics information through sysfs.
  37
  38           If in doubt, say N.
  39
  40 config CPU_FREQ_TIMES
  41        bool "CPU frequency time-in-state statistics"
  42        help
  43          Export CPU time-in-state information through procfs.
  44
  45          If in doubt, say N.
  46
  47 choice
  48         prompt "Default CPUFreq governor"
  49         default CPU_FREQ_DEFAULT_GOV_USERSPACE if ARM_SA1100_CPUFREQ || ARM_SA1110_CPUFREQ
  50         default CPU_FREQ_DEFAULT_GOV_PERFORMANCE
  51         help
  52           This option sets which CPUFreq governor shall be loaded at
  53           startup. If in doubt, select 'performance'.
  54
  55 config CPU_FREQ_DEFAULT_GOV_PERFORMANCE
  56         bool "performance"
  57         select CPU_FREQ_GOV_PERFORMANCE
  58         help
  59           Use the CPUFreq governor 'performance' as default. This sets
  60           the frequency statically to the highest frequency supported by
  61           the CPU.
  62
  63 config CPU_FREQ_DEFAULT_GOV_POWERSAVE
  64         bool "powersave"
  65         select CPU_FREQ_GOV_POWERSAVE
  66         help
  67           Use the CPUFreq governor 'powersave' as default. This sets
  68           the frequency statically to the lowest frequency supported by
  69           the CPU.
  70
  71 config CPU_FREQ_DEFAULT_GOV_USERSPACE
  72         bool "userspace"
  73         select CPU_FREQ_GOV_USERSPACE
  74         help
  75           Use the CPUFreq governor 'userspace' as default. This allows
  76           you to set the CPU frequency manually or when a userspace
  77           program shall be able to set the CPU dynamically without having
  78           to enable the userspace governor manually.
  79
  80 config CPU_FREQ_DEFAULT_GOV_ONDEMAND
  81         bool "ondemand"
  82         select CPU_FREQ_GOV_ONDEMAND
  83         select CPU_FREQ_GOV_PERFORMANCE
  84         help
  85           Use the CPUFreq governor 'ondemand' as default. This allows
  86           you to get a full dynamic frequency capable system by simply
  87           loading your cpufreq low-level hardware driver.
  88           Be aware that not all cpufreq drivers support the ondemand
  89           governor. If unsure have a look at the help section of the
  90           driver. Fallback governor will be the performance governor.
  91
  92 config CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
  93         bool "conservative"
  94         select CPU_FREQ_GOV_CONSERVATIVE
  95         select CPU_FREQ_GOV_PERFORMANCE
  96         help
  97           Use the CPUFreq governor 'conservative' as default. This allows
  98           you to get a full dynamic frequency capable system by simply
  99           loading your cpufreq low-level hardware driver.
 100           Be aware that not all cpufreq drivers support the conservative
 101           governor. If unsure have a look at the help section of the
 102           driver. Fallback governor will be the performance governor.
 103
 104 config CPU_FREQ_DEFAULT_GOV_SCHEDUTIL
 105         bool "schedutil"
 106         depends on SMP
 107         select CPU_FREQ_GOV_SCHEDUTIL
 108         help
 109           Use the 'schedutil' CPUFreq governor by default. If unsure,
 110           have a look at the help section of that governor. The fallback
 111           governor will be 'performance'.
 112
 113 endchoice
 114
 115 config CPU_FREQ_GOV_PERFORMANCE
 116         tristate "'performance' governor"
 117         help
 118           This cpufreq governor sets the frequency statically to the
 119           highest available CPU frequency.
 120
 121           To compile this driver as a module, choose M here: the
 122           module will be called cpufreq_performance.
 123
 124           If in doubt, say Y.
 125
 126 config CPU_FREQ_GOV_POWERSAVE
 127         tristate "'powersave' governor"
 128         help
 129           This cpufreq governor sets the frequency statically to the
 130           lowest available CPU frequency.
 131
 132           To compile this driver as a module, choose M here: the
 133           module will be called cpufreq_powersave.
 134
 135           If in doubt, say Y.
 136
 137 config CPU_FREQ_GOV_USERSPACE
 138         tristate "'userspace' governor for userspace frequency scaling"
 139         help
 140           Enable this cpufreq governor when you either want to set the
 141           CPU frequency manually or when a userspace program shall
 142           be able to set the CPU dynamically, like on LART
 143           <http://www.lartmaker.nl/>.
 144
 145           To compile this driver as a module, choose M here: the
 146           module will be called cpufreq_userspace.
 147
 148           For details, take a look at <file:Documentation/cpu-freq/>.
 149
 150           If in doubt, say Y.
 151
 152 config CPU_FREQ_GOV_ONDEMAND
 153         tristate "'ondemand' cpufreq policy governor"
 154         select CPU_FREQ_GOV_COMMON
 155         help
 156           'ondemand' - This driver adds a dynamic cpufreq policy governor.
 157           The governor does a periodic polling and
 158           changes frequency based on the CPU utilization.
 159           The support for this governor depends on CPU capability to
 160           do fast frequency switching (i.e, very low latency frequency
 161           transitions).
 162
 163           To compile this driver as a module, choose M here: the
 164           module will be called cpufreq_ondemand.
 165
 166           For details, take a look at linux/Documentation/cpu-freq.
 167
 168           If in doubt, say N.
 169
 170 config CPU_FREQ_GOV_CONSERVATIVE
 171         tristate "'conservative' cpufreq governor"
 172         depends on CPU_FREQ
 173         select CPU_FREQ_GOV_COMMON
 174         help
 175           'conservative' - this driver is rather similar to the 'ondemand'
 176           governor both in its source code and its purpose, the difference is
 177           its optimisation for better suitability in a battery powered
 178           environment.  The frequency is gracefully increased and decreased
 179           rather than jumping to 100% when speed is required.
 180
 181           If you have a desktop machine then you should really be considering
 182           the 'ondemand' governor instead, however if you are using a laptop,
 183           PDA or even an AMD64 based computer (due to the unacceptable
 184           step-by-step latency issues between the minimum and maximum frequency
 185           transitions in the CPU) you will probably want to use this governor.
 186
 187           To compile this driver as a module, choose M here: the
 188           module will be called cpufreq_conservative.
 189
 190           For details, take a look at linux/Documentation/cpu-freq.
 191
 192           If in doubt, say N.
 193
 194 config CPU_FREQ_GOV_SCHEDUTIL
 195         bool "'schedutil' cpufreq policy governor"
 196         depends on CPU_FREQ && SMP
 197         select CPU_FREQ_GOV_ATTR_SET
 198         select IRQ_WORK
 199         help
 200           This governor makes decisions based on the utilization data provided
 201           by the scheduler.  It sets the CPU frequency to be proportional to
 202           the utilization/capacity ratio coming from the scheduler.  If the
 203           utilization is frequency-invariant, the new frequency is also
 204           proportional to the maximum available frequency.  If that is not the
 205           case, it is proportional to the current frequency of the CPU.  The
 206           frequency tipping point is at utilization/capacity equal to 80% in
 207           both cases.
 208
 209           If in doubt, say N.
 210
 211 config FREQVAR_TUNE
 212         bool "CPU frequency variant tuner"
 213         depends on SCHED_EMS && CPU_FREQ_GOV_SCHEDUTIL
 214         help
 215           This option provides the controller which tunes system performance
 216           as frequency variant.
 217
 218           Say N if unsure.
 219
 220 comment "CPU frequency scaling drivers"
 221
 222 config CPUFREQ_DT
 223         tristate "Generic DT based cpufreq driver"
 224         depends on HAVE_CLK && OF
 225         # if CPU_THERMAL is on and THERMAL=m, CPUFREQ_DT cannot be =y:
 226         depends on !CPU_THERMAL || THERMAL
 227         select CPUFREQ_DT_PLATDEV
 228         select PM_OPP
 229         help
 230           This adds a generic DT based cpufreq driver for frequency management.
 231           It supports both uniprocessor (UP) and symmetric multiprocessor (SMP)
 232           systems.
 233
 234           If in doubt, say N.
 235
 236 config CPUFREQ_DT_PLATDEV
 237         bool
 238         help
 239           This adds a generic DT based cpufreq platdev driver for frequency
 240           management.  This creates a 'cpufreq-dt' platform device, on the
 241           supported platforms.
 242
 243           If in doubt, say N.
 244
 245 if X86
 246 source "drivers/cpufreq/Kconfig.x86"
 247 endif
 248
 249 if ARM || ARM64
 250 source "drivers/cpufreq/Kconfig.arm"
 251 endif
 252
 253 if PPC32 || PPC64
 254 source "drivers/cpufreq/Kconfig.powerpc"
 255 endif
 256
 257 if AVR32
 258 config AVR32_AT32AP_CPUFREQ
 259         bool "CPU frequency driver for AT32AP"
 260         depends on PLATFORM_AT32AP
 261         default n
 262         help
 263           This enables the CPU frequency driver for AT32AP processors.
 264           If in doubt, say N.
 265 endif
 266
 267 if IA64
 268 config IA64_ACPI_CPUFREQ
 269         tristate "ACPI Processor P-States driver"
 270         depends on ACPI_PROCESSOR
 271         help
 272         This driver adds a CPUFreq driver which utilizes the ACPI
 273         Processor Performance States.
 274
 275         For details, take a look at <file:Documentation/cpu-freq/>.
 276
 277         If in doubt, say N.
 278 endif
 279
 280 if MIPS
 281 config BMIPS_CPUFREQ
 282         tristate "BMIPS CPUfreq Driver"
 283         help
 284           This option adds a CPUfreq driver for BMIPS processors with
 285           support for configurable CPU frequency.
 286
 287           For now, BMIPS5 chips are supported (such as the Broadcom 7425).
 288
 289           If in doubt, say N.
 290
 291 config LOONGSON2_CPUFREQ
 292         tristate "Loongson2 CPUFreq Driver"
 293         depends on LEMOTE_MACH2F
 294         help
 295           This option adds a CPUFreq driver for loongson processors which
 296           support software configurable cpu frequency.
 297
 298           Loongson2F and it's successors support this feature.
 299
 300           For details, take a look at <file:Documentation/cpu-freq/>.
 301
 302           If in doubt, say N.
 303
 304 config LOONGSON1_CPUFREQ
 305         tristate "Loongson1 CPUFreq Driver"
 306         depends on LOONGSON1_LS1B
 307         help
 308           This option adds a CPUFreq driver for loongson1 processors which
 309           support software configurable cpu frequency.
 310
 311           For details, take a look at <file:Documentation/cpu-freq/>.
 312
 313           If in doubt, say N.
 314 endif
 315
 316 if SPARC64
 317 config SPARC_US3_CPUFREQ
 318         tristate "UltraSPARC-III CPU Frequency driver"
 319         help
 320           This adds the CPUFreq driver for UltraSPARC-III processors.
 321
 322           For details, take a look at <file:Documentation/cpu-freq>.
 323
 324           If in doubt, say N.
 325
 326 config SPARC_US2E_CPUFREQ
 327         tristate "UltraSPARC-IIe CPU Frequency driver"
 328         help
 329           This adds the CPUFreq driver for UltraSPARC-IIe processors.
 330
 331           For details, take a look at <file:Documentation/cpu-freq>.
 332
 333           If in doubt, say N.
 334 endif
 335
 336 if SUPERH
 337 config SH_CPU_FREQ
 338         tristate "SuperH CPU Frequency driver"
 339         help
 340           This adds the cpufreq driver for SuperH. Any CPU that supports
 341           clock rate rounding through the clock framework can use this
 342           driver. While it will make the kernel slightly larger, this is
 343           harmless for CPUs that don't support rate rounding. The driver
 344           will also generate a notice in the boot log before disabling
 345           itself if the CPU in question is not capable of rate rounding.
 346
 347           For details, take a look at <file:Documentation/cpu-freq>.
 348
 349           If unsure, say N.
 350 endif
 351
 352 config QORIQ_CPUFREQ
 353         tristate "CPU frequency scaling driver for Freescale QorIQ SoCs"
 354         depends on OF && COMMON_CLK && (PPC_E500MC || ARM || ARM64)
 355         depends on !CPU_THERMAL || THERMAL
 356         select CLK_QORIQ
 357         help
 358           This adds the CPUFreq driver support for Freescale QorIQ SoCs
 359           which are capable of changing the CPU's frequency dynamically.
 360
 361 comment "P-state Boost Solutions"
 362
 363 choice EXYNOS_PSTATE
 364         prompt "P-state Boost Solution"
 365         default EXYNOS_PSTATE_DISABLE
 366         depends on ARCH_EXYNOS
 367         depends on CPU_FREQ
 368         help
 369           Default status of P-state boost is disable.
 370
 371 config EXYNOS_PSTATE_DISABLE
 372         bool "disable"
 373         help
 374           This option sets P-state boost solution as disable.
 375           If in doubt, set this config.
 376
 377 config EXYNOS_PSTATE_HAFM
 378         bool "Exynos HAFM"
 379         help
 380           This option sets P-state boost solution as HAFM.
 381           The config makes HIU just deliver frequency level and power budget
 382           given from CPUFreq driver and register set.
 383
 384 config EXYNOS_PSTATE_HAFM_TB
 385         bool "Exynos HAFM-TB"
 386         help
 387           This option sets P-state boost solution as HAFM-TB.
 388
 389 config EXYNOS_PSTATE_MODE_CHANGER
 390         bool "Exynos Mode Changer"
 391         depends on HOTPLUG_CPU
 392         help
 393           This option sets P-state boost solution as EMC.
 394
 395 endchoice
 396
 397 endif
 398 endmenu