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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        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 preferred
 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 55           file has now been superseded by the more generic "boost" entry.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 X86_SFI_CPUFREQ
 61         tristate "SFI Performance-States driver"
 62         depends on X86_INTEL_MID && SFI
 63         help
 64           This adds a CPUFreq driver for some Silvermont based Intel Atom
 65           architectures like Z34xx and Z35xx which enumerate processor
 66           performance states through SFI.
 67 
 68           If in doubt, say N.
 69 
 70 config ELAN_CPUFREQ
 71         tristate "AMD Elan SC400 and SC410"
 72         depends on MELAN
 73         ---help---
 74           This adds the CPUFreq driver for AMD Elan SC400 and SC410
 75           processors.
 76 
 77           You need to specify the processor maximum speed as boot
 78           parameter: elanfreq=maxspeed (in kHz) or as module
 79           parameter "max_freq".
 80 
 81           For details, take a look at <file:Documentation/cpu-freq/>.
 82 
 83           If in doubt, say N.
 84 
 85 config SC520_CPUFREQ
 86         tristate "AMD Elan SC520"
 87         depends on MELAN
 88         ---help---
 89           This adds the CPUFreq driver for AMD Elan SC520 processor.
 90 
 91           For details, take a look at <file:Documentation/cpu-freq/>.
 92 
 93           If in doubt, say N.
 94 
 95 
 96 config X86_POWERNOW_K6
 97         tristate "AMD Mobile K6-2/K6-3 PowerNow!"
 98         depends on X86_32
 99         help
100           This adds the CPUFreq driver for mobile AMD K6-2+ and mobile
101           AMD K6-3+ 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
108         tristate "AMD Mobile Athlon/Duron PowerNow!"
109         depends on X86_32
110         help
111           This adds the CPUFreq driver for mobile AMD K7 mobile processors.
112 
113           For details, take a look at <file:Documentation/cpu-freq/>.
114 
115           If in doubt, say N.
116 
117 config X86_POWERNOW_K7_ACPI
118         bool
119         depends on X86_POWERNOW_K7 && ACPI_PROCESSOR
120         depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m)
121         depends on X86_32
122         default y
123 
124 config X86_POWERNOW_K8
125         tristate "AMD Opteron/Athlon64 PowerNow!"
126         depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ
127         help
128           This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors.
129           Support for K10 and newer processors is now in acpi-cpufreq.
130 
131           To compile this driver as a module, choose M here: the
132           module will be called powernow-k8.
133 
134           For details, take a look at <file:Documentation/cpu-freq/>.
135 
136 config X86_AMD_FREQ_SENSITIVITY
137         tristate "AMD frequency sensitivity feedback powersave bias"
138         depends on CPU_FREQ_GOV_ONDEMAND && X86_ACPI_CPUFREQ && CPU_SUP_AMD
139         help
140           This adds AMD-specific powersave bias function to the ondemand
141           governor, which allows it to make more power-conscious frequency
142           change decisions based on feedback from hardware (available on AMD
143           Family 16h and above).
144 
145           Hardware feedback tells software how "sensitive" to frequency changes
146           the CPUs' workloads are. CPU-bound workloads will be more sensitive
147           -- they will perform better as frequency increases. Memory/IO-bound
148           workloads will be less sensitive -- they will not necessarily perform
149           better as frequency increases.
150 
151           If in doubt, say N.
152 
153 config X86_GX_SUSPMOD
154         tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
155         depends on X86_32 && PCI
156         help
157          This add the CPUFreq driver for NatSemi Geode processors which
158          support suspend modulation.
159 
160          For details, take a look at <file:Documentation/cpu-freq/>.
161 
162          If in doubt, say N.
163 
164 config X86_SPEEDSTEP_CENTRINO
165         tristate "Intel Enhanced SpeedStep (deprecated)"
166         select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
167         depends on X86_32 || (X86_64 && ACPI_PROCESSOR)
168         help
169           This is deprecated and this functionality is now merged into
170           acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
171           speedstep_centrino.
172           This adds the CPUFreq driver for Enhanced SpeedStep enabled
173           mobile CPUs.  This means Intel Pentium M (Centrino) CPUs
174           or 64bit enabled Intel Xeons.
175 
176           To compile this driver as a module, choose M here: the
177           module will be called speedstep-centrino.
178 
179           For details, take a look at <file:Documentation/cpu-freq/>.
180 
181           If in doubt, say N.
182 
183 config X86_SPEEDSTEP_CENTRINO_TABLE
184         bool "Built-in tables for Banias CPUs"
185         depends on X86_32 && X86_SPEEDSTEP_CENTRINO
186         default y
187         help
188           Use built-in tables for Banias CPUs if ACPI encoding
189           is not available.
190 
191           If in doubt, say N.
192 
193 config X86_SPEEDSTEP_ICH
194         tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
195         depends on X86_32
196         help
197           This adds the CPUFreq driver for certain mobile Intel Pentium III
198           (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
199           mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
200           ICH3 or ICH4 southbridge.
201 
202           For details, take a look at <file:Documentation/cpu-freq/>.
203 
204           If in doubt, say N.
205 
206 config X86_SPEEDSTEP_SMI
207         tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
208         depends on X86_32
209         help
210           This adds the CPUFreq driver for certain mobile Intel Pentium III
211           (Coppermine), all mobile Intel Pentium III-M (Tualatin)
212           on systems which have an Intel 440BX/ZX/MX southbridge.
213 
214           For details, take a look at <file:Documentation/cpu-freq/>.
215 
216           If in doubt, say N.
217 
218 config X86_P4_CLOCKMOD
219         tristate "Intel Pentium 4 clock modulation"
220         help
221           This adds the CPUFreq driver for Intel Pentium 4 / XEON
222           processors.  When enabled it will lower CPU temperature by skipping
223           clocks.
224 
225           This driver should be only used in exceptional
226           circumstances when very low power is needed because it causes severe
227           slowdowns and noticeable latencies.  Normally Speedstep should be used
228           instead.
229 
230           To compile this driver as a module, choose M here: the
231           module will be called p4-clockmod.
232 
233           For details, take a look at <file:Documentation/cpu-freq/>.
234 
235           Unless you are absolutely sure say N.
236 
237 config X86_CPUFREQ_NFORCE2
238         tristate "nVidia nForce2 FSB changing"
239         depends on X86_32
240         help
241           This adds the CPUFreq driver for FSB changing on nVidia nForce2
242           platforms.
243 
244           For details, take a look at <file:Documentation/cpu-freq/>.
245 
246           If in doubt, say N.
247 
248 config X86_LONGRUN
249         tristate "Transmeta LongRun"
250         depends on X86_32
251         help
252           This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors
253           which support LongRun.
254 
255           For details, take a look at <file:Documentation/cpu-freq/>.
256 
257           If in doubt, say N.
258 
259 config X86_LONGHAUL
260         tristate "VIA Cyrix III Longhaul"
261         depends on X86_32 && ACPI_PROCESSOR
262         help
263           This adds the CPUFreq driver for VIA Samuel/CyrixIII,
264           VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
265           processors.
266 
267           For details, take a look at <file:Documentation/cpu-freq/>.
268 
269           If in doubt, say N.
270 
271 config X86_E_POWERSAVER
272         tristate "VIA C7 Enhanced PowerSaver (DANGEROUS)"
273         depends on X86_32 && ACPI_PROCESSOR
274         help
275           This adds the CPUFreq driver for VIA C7 processors.  However, this driver
276           does not have any safeguards to prevent operating the CPU out of spec
277           and is thus considered dangerous.  Please use the regular ACPI cpufreq
278           driver, enabled by CONFIG_X86_ACPI_CPUFREQ.
279 
280           If in doubt, say N.
281 
282 comment "shared options"
283 
284 config X86_SPEEDSTEP_LIB
285         tristate
286         default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD)
287 
288 config X86_SPEEDSTEP_RELAXED_CAP_CHECK
289         bool "Relaxed speedstep capability checks"
290         depends on X86_32 && (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH)
291         help
292           Don't perform all checks for a speedstep capable system which would
293           normally be done. Some ancient or strange systems, though speedstep
294           capable, don't always indicate that they are speedstep capable. This
295           option lets the probing code bypass some of those checks if the
296           parameter "relaxed_check=1" is passed to the module.
297 

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