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 55           file has now been superseded by the more generic "boost" entry.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

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