Version:  2.0.40 2.2.26 2.4.37 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8

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        help
 10           This driver provides a P state for Intel core processors.
 11           The driver implements an internal governor and will become
 12           the scaling driver and governor for Sandy bridge processors.
 13 
 14           When this driver is enabled it will become the preferred
 15           scaling driver for Sandy bridge processors.
 16 
 17           If in doubt, say N.
 18 
 19 config X86_PCC_CPUFREQ
 20         tristate "Processor Clocking Control interface driver"
 21         depends on ACPI && ACPI_PROCESSOR
 22         help
 23           This driver adds support for the PCC interface.
 24 
 25           For details, take a look at:
 26           <file:Documentation/cpu-freq/pcc-cpufreq.txt>.
 27 
 28           To compile this driver as a module, choose M here: the
 29           module will be called pcc-cpufreq.
 30 
 31           If in doubt, say N.
 32 
 33 config X86_ACPI_CPUFREQ
 34         tristate "ACPI Processor P-States driver"
 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 56           file has now been superseded by the more generic "boost" entry.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 X86_SFI_CPUFREQ
 62         tristate "SFI Performance-States driver"
 63         depends on X86_INTEL_MID && SFI
 64         help
 65           This adds a CPUFreq driver for some Silvermont based Intel Atom
 66           architectures like Z34xx and Z35xx which enumerate processor
 67           performance states through SFI.
 68 
 69           If in doubt, say N.
 70 
 71 config ELAN_CPUFREQ
 72         tristate "AMD Elan SC400 and SC410"
 73         depends on MELAN
 74         ---help---
 75           This adds the CPUFreq driver for AMD Elan SC400 and SC410
 76           processors.
 77 
 78           You need to specify the processor maximum speed as boot
 79           parameter: elanfreq=maxspeed (in kHz) or as module
 80           parameter "max_freq".
 81 
 82           For details, take a look at <file:Documentation/cpu-freq/>.
 83 
 84           If in doubt, say N.
 85 
 86 config SC520_CPUFREQ
 87         tristate "AMD Elan SC520"
 88         depends on MELAN
 89         ---help---
 90           This adds the CPUFreq driver for AMD Elan SC520 processor.
 91 
 92           For details, take a look at <file:Documentation/cpu-freq/>.
 93 
 94           If in doubt, say N.
 95 
 96 
 97 config X86_POWERNOW_K6
 98         tristate "AMD Mobile K6-2/K6-3 PowerNow!"
 99         depends on X86_32
100         help
101           This adds the CPUFreq driver for mobile AMD K6-2+ and mobile
102           AMD K6-3+ processors.
103 
104           For details, take a look at <file:Documentation/cpu-freq/>.
105 
106           If in doubt, say N.
107 
108 config X86_POWERNOW_K7
109         tristate "AMD Mobile Athlon/Duron PowerNow!"
110         depends on X86_32
111         help
112           This adds the CPUFreq driver for mobile AMD K7 mobile processors.
113 
114           For details, take a look at <file:Documentation/cpu-freq/>.
115 
116           If in doubt, say N.
117 
118 config X86_POWERNOW_K7_ACPI
119         bool
120         depends on X86_POWERNOW_K7 && ACPI_PROCESSOR
121         depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m)
122         depends on X86_32
123         default y
124 
125 config X86_POWERNOW_K8
126         tristate "AMD Opteron/Athlon64 PowerNow!"
127         depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ
128         help
129           This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors.
130           Support for K10 and newer processors is now in acpi-cpufreq.
131 
132           To compile this driver as a module, choose M here: the
133           module will be called powernow-k8.
134 
135           For details, take a look at <file:Documentation/cpu-freq/>.
136 
137 config X86_AMD_FREQ_SENSITIVITY
138         tristate "AMD frequency sensitivity feedback powersave bias"
139         depends on CPU_FREQ_GOV_ONDEMAND && X86_ACPI_CPUFREQ && CPU_SUP_AMD
140         help
141           This adds AMD-specific powersave bias function to the ondemand
142           governor, which allows it to make more power-conscious frequency
143           change decisions based on feedback from hardware (available on AMD
144           Family 16h and above).
145 
146           Hardware feedback tells software how "sensitive" to frequency changes
147           the CPUs' workloads are. CPU-bound workloads will be more sensitive
148           -- they will perform better as frequency increases. Memory/IO-bound
149           workloads will be less sensitive -- they will not necessarily perform
150           better as frequency increases.
151 
152           If in doubt, say N.
153 
154 config X86_GX_SUSPMOD
155         tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
156         depends on X86_32 && PCI
157         help
158          This add the CPUFreq driver for NatSemi Geode processors which
159          support suspend modulation.
160 
161          For details, take a look at <file:Documentation/cpu-freq/>.
162 
163          If in doubt, say N.
164 
165 config X86_SPEEDSTEP_CENTRINO
166         tristate "Intel Enhanced SpeedStep (deprecated)"
167         select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
168         depends on X86_32 || (X86_64 && ACPI_PROCESSOR)
169         help
170           This is deprecated and this functionality is now merged into
171           acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
172           speedstep_centrino.
173           This adds the CPUFreq driver for Enhanced SpeedStep enabled
174           mobile CPUs.  This means Intel Pentium M (Centrino) CPUs
175           or 64bit enabled Intel Xeons.
176 
177           To compile this driver as a module, choose M here: the
178           module will be called speedstep-centrino.
179 
180           For details, take a look at <file:Documentation/cpu-freq/>.
181 
182           If in doubt, say N.
183 
184 config X86_SPEEDSTEP_CENTRINO_TABLE
185         bool "Built-in tables for Banias CPUs"
186         depends on X86_32 && X86_SPEEDSTEP_CENTRINO
187         default y
188         help
189           Use built-in tables for Banias CPUs if ACPI encoding
190           is not available.
191 
192           If in doubt, say N.
193 
194 config X86_SPEEDSTEP_ICH
195         tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
196         depends on X86_32
197         help
198           This adds the CPUFreq driver for certain mobile Intel Pentium III
199           (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
200           mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
201           ICH3 or ICH4 southbridge.
202 
203           For details, take a look at <file:Documentation/cpu-freq/>.
204 
205           If in doubt, say N.
206 
207 config X86_SPEEDSTEP_SMI
208         tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
209         depends on X86_32
210         help
211           This adds the CPUFreq driver for certain mobile Intel Pentium III
212           (Coppermine), all mobile Intel Pentium III-M (Tualatin)
213           on systems which have an Intel 440BX/ZX/MX southbridge.
214 
215           For details, take a look at <file:Documentation/cpu-freq/>.
216 
217           If in doubt, say N.
218 
219 config X86_P4_CLOCKMOD
220         tristate "Intel Pentium 4 clock modulation"
221         help
222           This adds the CPUFreq driver for Intel Pentium 4 / XEON
223           processors.  When enabled it will lower CPU temperature by skipping
224           clocks.
225 
226           This driver should be only used in exceptional
227           circumstances when very low power is needed because it causes severe
228           slowdowns and noticeable latencies.  Normally Speedstep should be used
229           instead.
230 
231           To compile this driver as a module, choose M here: the
232           module will be called p4-clockmod.
233 
234           For details, take a look at <file:Documentation/cpu-freq/>.
235 
236           Unless you are absolutely sure say N.
237 
238 config X86_CPUFREQ_NFORCE2
239         tristate "nVidia nForce2 FSB changing"
240         depends on X86_32
241         help
242           This adds the CPUFreq driver for FSB changing on nVidia nForce2
243           platforms.
244 
245           For details, take a look at <file:Documentation/cpu-freq/>.
246 
247           If in doubt, say N.
248 
249 config X86_LONGRUN
250         tristate "Transmeta LongRun"
251         depends on X86_32
252         help
253           This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors
254           which support LongRun.
255 
256           For details, take a look at <file:Documentation/cpu-freq/>.
257 
258           If in doubt, say N.
259 
260 config X86_LONGHAUL
261         tristate "VIA Cyrix III Longhaul"
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 
272 config X86_E_POWERSAVER
273         tristate "VIA C7 Enhanced PowerSaver (DANGEROUS)"
274         depends on X86_32 && ACPI_PROCESSOR
275         help
276           This adds the CPUFreq driver for VIA C7 processors.  However, this driver
277           does not have any safeguards to prevent operating the CPU out of spec
278           and is thus considered dangerous.  Please use the regular ACPI cpufreq
279           driver, enabled by CONFIG_X86_ACPI_CPUFREQ.
280 
281           If in doubt, say N.
282 
283 comment "shared options"
284 
285 config X86_SPEEDSTEP_LIB
286         tristate
287         default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD)
288 
289 config X86_SPEEDSTEP_RELAXED_CAP_CHECK
290         bool "Relaxed speedstep capability checks"
291         depends on X86_32 && (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH)
292         help
293           Don't perform all checks for a speedstep capable system which would
294           normally be done. Some ancient or strange systems, though speedstep
295           capable, don't always indicate that they are speedstep capable. This
296           option lets the probing code bypass some of those checks if the
297           parameter "relaxed_check=1" is passed to the module.
298 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us