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Linux/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        select ACPI_PROCESSOR if ACPI
  9        select ACPI_CPPC_LIB if X86_64 && ACPI && SCHED_MC_PRIO
 10        help
 11           This driver provides a P state for Intel core processors.
 12           The driver implements an internal governor and will become
 13           the scaling driver and governor for Sandy bridge processors.
 14 
 15           When this driver is enabled it will become the preferred
 16           scaling driver for Sandy bridge processors.
 17 
 18           If in doubt, say N.
 19 
 20 config X86_PCC_CPUFREQ
 21         tristate "Processor Clocking Control interface driver"
 22         depends on ACPI && ACPI_PROCESSOR
 23         help
 24           This driver adds support for the PCC interface.
 25 
 26           For details, take a look at:
 27           <file:Documentation/cpu-freq/pcc-cpufreq.txt>.
 28 
 29           To compile this driver as a module, choose M here: the
 30           module will be called pcc-cpufreq.
 31 
 32           If in doubt, say N.
 33 
 34 config X86_ACPI_CPUFREQ
 35         tristate "ACPI Processor P-States driver"
 36         depends on ACPI_PROCESSOR
 37         help
 38           This driver adds a CPUFreq driver which utilizes the ACPI
 39           Processor Performance States.
 40           This driver also supports Intel Enhanced Speedstep and newer
 41           AMD CPUs.
 42 
 43           To compile this driver as a module, choose M here: the
 44           module will be called acpi-cpufreq.
 45 
 46           For details, take a look at <file:Documentation/cpu-freq/>.
 47 
 48           If in doubt, say N.
 49 
 50 config X86_ACPI_CPUFREQ_CPB
 51         default y
 52         bool "Legacy cpb sysfs knob support for AMD CPUs"
 53         depends on X86_ACPI_CPUFREQ && CPU_SUP_AMD
 54         help
 55           The powernow-k8 driver used to provide a sysfs knob called "cpb"
 56           to disable the Core Performance Boosting feature of AMD CPUs. This
 57           file has now been superseded by the more generic "boost" entry.
 58 
 59           By enabling this option the acpi_cpufreq driver provides the old
 60           entry in addition to the new boost ones, for compatibility reasons.
 61 
 62 config X86_SFI_CPUFREQ
 63         tristate "SFI Performance-States driver"
 64         depends on X86_INTEL_MID && SFI
 65         help
 66           This adds a CPUFreq driver for some Silvermont based Intel Atom
 67           architectures like Z34xx and Z35xx which enumerate processor
 68           performance states through SFI.
 69 
 70           If in doubt, say N.
 71 
 72 config ELAN_CPUFREQ
 73         tristate "AMD Elan SC400 and SC410"
 74         depends on MELAN
 75         ---help---
 76           This adds the CPUFreq driver for AMD Elan SC400 and SC410
 77           processors.
 78 
 79           You need to specify the processor maximum speed as boot
 80           parameter: elanfreq=maxspeed (in kHz) or as module
 81           parameter "max_freq".
 82 
 83           For details, take a look at <file:Documentation/cpu-freq/>.
 84 
 85           If in doubt, say N.
 86 
 87 config SC520_CPUFREQ
 88         tristate "AMD Elan SC520"
 89         depends on MELAN
 90         ---help---
 91           This adds the CPUFreq driver for AMD Elan SC520 processor.
 92 
 93           For details, take a look at <file:Documentation/cpu-freq/>.
 94 
 95           If in doubt, say N.
 96 
 97 
 98 config X86_POWERNOW_K6
 99         tristate "AMD Mobile K6-2/K6-3 PowerNow!"
100         depends on X86_32
101         help
102           This adds the CPUFreq driver for mobile AMD K6-2+ and mobile
103           AMD K6-3+ processors.
104 
105           For details, take a look at <file:Documentation/cpu-freq/>.
106 
107           If in doubt, say N.
108 
109 config X86_POWERNOW_K7
110         tristate "AMD Mobile Athlon/Duron PowerNow!"
111         depends on X86_32
112         help
113           This adds the CPUFreq driver for mobile AMD K7 mobile processors.
114 
115           For details, take a look at <file:Documentation/cpu-freq/>.
116 
117           If in doubt, say N.
118 
119 config X86_POWERNOW_K7_ACPI
120         bool
121         depends on X86_POWERNOW_K7 && ACPI_PROCESSOR
122         depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m)
123         depends on X86_32
124         default y
125 
126 config X86_POWERNOW_K8
127         tristate "AMD Opteron/Athlon64 PowerNow!"
128         depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ
129         help
130           This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors.
131           Support for K10 and newer processors is now in acpi-cpufreq.
132 
133           To compile this driver as a module, choose M here: the
134           module will be called powernow-k8.
135 
136           For details, take a look at <file:Documentation/cpu-freq/>.
137 
138 config X86_AMD_FREQ_SENSITIVITY
139         tristate "AMD frequency sensitivity feedback powersave bias"
140         depends on CPU_FREQ_GOV_ONDEMAND && X86_ACPI_CPUFREQ && CPU_SUP_AMD
141         help
142           This adds AMD-specific powersave bias function to the ondemand
143           governor, which allows it to make more power-conscious frequency
144           change decisions based on feedback from hardware (available on AMD
145           Family 16h and above).
146 
147           Hardware feedback tells software how "sensitive" to frequency changes
148           the CPUs' workloads are. CPU-bound workloads will be more sensitive
149           -- they will perform better as frequency increases. Memory/IO-bound
150           workloads will be less sensitive -- they will not necessarily perform
151           better as frequency increases.
152 
153           If in doubt, say N.
154 
155 config X86_GX_SUSPMOD
156         tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
157         depends on X86_32 && PCI
158         help
159          This add the CPUFreq driver for NatSemi Geode processors which
160          support suspend modulation.
161 
162          For details, take a look at <file:Documentation/cpu-freq/>.
163 
164          If in doubt, say N.
165 
166 config X86_SPEEDSTEP_CENTRINO
167         tristate "Intel Enhanced SpeedStep (deprecated)"
168         select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
169         depends on X86_32 || (X86_64 && ACPI_PROCESSOR)
170         help
171           This is deprecated and this functionality is now merged into
172           acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
173           speedstep_centrino.
174           This adds the CPUFreq driver for Enhanced SpeedStep enabled
175           mobile CPUs.  This means Intel Pentium M (Centrino) CPUs
176           or 64bit enabled Intel Xeons.
177 
178           To compile this driver as a module, choose M here: the
179           module will be called speedstep-centrino.
180 
181           For details, take a look at <file:Documentation/cpu-freq/>.
182 
183           If in doubt, say N.
184 
185 config X86_SPEEDSTEP_CENTRINO_TABLE
186         bool "Built-in tables for Banias CPUs"
187         depends on X86_32 && X86_SPEEDSTEP_CENTRINO
188         default y
189         help
190           Use built-in tables for Banias CPUs if ACPI encoding
191           is not available.
192 
193           If in doubt, say N.
194 
195 config X86_SPEEDSTEP_ICH
196         tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
197         depends on X86_32
198         help
199           This adds the CPUFreq driver for certain mobile Intel Pentium III
200           (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
201           mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
202           ICH3 or ICH4 southbridge.
203 
204           For details, take a look at <file:Documentation/cpu-freq/>.
205 
206           If in doubt, say N.
207 
208 config X86_SPEEDSTEP_SMI
209         tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
210         depends on X86_32
211         help
212           This adds the CPUFreq driver for certain mobile Intel Pentium III
213           (Coppermine), all mobile Intel Pentium III-M (Tualatin)
214           on systems which have an Intel 440BX/ZX/MX southbridge.
215 
216           For details, take a look at <file:Documentation/cpu-freq/>.
217 
218           If in doubt, say N.
219 
220 config X86_P4_CLOCKMOD
221         tristate "Intel Pentium 4 clock modulation"
222         help
223           This adds the CPUFreq driver for Intel Pentium 4 / XEON
224           processors.  When enabled it will lower CPU temperature by skipping
225           clocks.
226 
227           This driver should be only used in exceptional
228           circumstances when very low power is needed because it causes severe
229           slowdowns and noticeable latencies.  Normally Speedstep should be used
230           instead.
231 
232           To compile this driver as a module, choose M here: the
233           module will be called p4-clockmod.
234 
235           For details, take a look at <file:Documentation/cpu-freq/>.
236 
237           Unless you are absolutely sure say N.
238 
239 config X86_CPUFREQ_NFORCE2
240         tristate "nVidia nForce2 FSB changing"
241         depends on X86_32
242         help
243           This adds the CPUFreq driver for FSB changing on nVidia nForce2
244           platforms.
245 
246           For details, take a look at <file:Documentation/cpu-freq/>.
247 
248           If in doubt, say N.
249 
250 config X86_LONGRUN
251         tristate "Transmeta LongRun"
252         depends on X86_32
253         help
254           This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors
255           which support LongRun.
256 
257           For details, take a look at <file:Documentation/cpu-freq/>.
258 
259           If in doubt, say N.
260 
261 config X86_LONGHAUL
262         tristate "VIA Cyrix III Longhaul"
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         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 
284 comment "shared options"
285 
286 config X86_SPEEDSTEP_LIB
287         tristate
288         default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD)
289 
290 config 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 

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