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1#
2# x86 CPU Frequency scaling drivers
3#
4
5config X86_PCC_CPUFREQ
6 tristate "Processor Clocking Control interface driver"
7 depends on ACPI && ACPI_PROCESSOR
8 help
9 This driver adds support for the PCC interface.
10
11 For details, take a look at:
12 <file:Documentation/cpu-freq/pcc-cpufreq.txt>.
13
14 To compile this driver as a module, choose M here: the
15 module will be called pcc-cpufreq.
16
17 If in doubt, say N.
18
19config X86_ACPI_CPUFREQ
20 tristate "ACPI Processor P-States driver"
21 select CPU_FREQ_TABLE
22 depends on ACPI_PROCESSOR
23 help
24 This driver adds a CPUFreq driver which utilizes the ACPI
25 Processor Performance States.
26 This driver also supports Intel Enhanced Speedstep.
27
28 To compile this driver as a module, choose M here: the
29 module will be called acpi-cpufreq.
30
31 For details, take a look at <file:Documentation/cpu-freq/>.
32
33 If in doubt, say N.
34
35config ELAN_CPUFREQ
36 tristate "AMD Elan SC400 and SC410"
37 select CPU_FREQ_TABLE
38 depends on MELAN
39 ---help---
40 This adds the CPUFreq driver for AMD Elan SC400 and SC410
41 processors.
42
43 You need to specify the processor maximum speed as boot
44 parameter: elanfreq=maxspeed (in kHz) or as module
45 parameter "max_freq".
46
47 For details, take a look at <file:Documentation/cpu-freq/>.
48
49 If in doubt, say N.
50
51config SC520_CPUFREQ
52 tristate "AMD Elan SC520"
53 select CPU_FREQ_TABLE
54 depends on MELAN
55 ---help---
56 This adds the CPUFreq driver for AMD Elan SC520 processor.
57
58 For details, take a look at <file:Documentation/cpu-freq/>.
59
60 If in doubt, say N.
61
62
63config X86_POWERNOW_K6
64 tristate "AMD Mobile K6-2/K6-3 PowerNow!"
65 select CPU_FREQ_TABLE
66 depends on X86_32
67 help
68 This adds the CPUFreq driver for mobile AMD K6-2+ and mobile
69 AMD K6-3+ processors.
70
71 For details, take a look at <file:Documentation/cpu-freq/>.
72
73 If in doubt, say N.
74
75config X86_POWERNOW_K7
76 tristate "AMD Mobile Athlon/Duron PowerNow!"
77 select CPU_FREQ_TABLE
78 depends on X86_32
79 help
80 This adds the CPUFreq driver for mobile AMD K7 mobile processors.
81
82 For details, take a look at <file:Documentation/cpu-freq/>.
83
84 If in doubt, say N.
85
86config X86_POWERNOW_K7_ACPI
87 bool
88 depends on X86_POWERNOW_K7 && ACPI_PROCESSOR
89 depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m)
90 depends on X86_32
91 default y
92
93config X86_POWERNOW_K8
94 tristate "AMD Opteron/Athlon64 PowerNow!"
95 select CPU_FREQ_TABLE
96 depends on ACPI && ACPI_PROCESSOR
97 help
98 This adds the CPUFreq driver for K8/K10 Opteron/Athlon64 processors.
99
100 To compile this driver as a module, choose M here: the
101 module will be called powernow-k8.
102
103 For details, take a look at <file:Documentation/cpu-freq/>.
104
105config X86_GX_SUSPMOD
106 tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
107 depends on X86_32 && PCI
108 help
109 This add the CPUFreq driver for NatSemi Geode processors which
110 support suspend modulation.
111
112 For details, take a look at <file:Documentation/cpu-freq/>.
113
114 If in doubt, say N.
115
116config X86_SPEEDSTEP_CENTRINO
117 tristate "Intel Enhanced SpeedStep (deprecated)"
118 select CPU_FREQ_TABLE
119 select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
120 depends on X86_32 || (X86_64 && ACPI_PROCESSOR)
121 help
122 This is deprecated and this functionality is now merged into
123 acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
124 speedstep_centrino.
125 This adds the CPUFreq driver for Enhanced SpeedStep enabled
126 mobile CPUs. This means Intel Pentium M (Centrino) CPUs
127 or 64bit enabled Intel Xeons.
128
129 To compile this driver as a module, choose M here: the
130 module will be called speedstep-centrino.
131
132 For details, take a look at <file:Documentation/cpu-freq/>.
133
134 If in doubt, say N.
135
136config X86_SPEEDSTEP_CENTRINO_TABLE
137 bool "Built-in tables for Banias CPUs"
138 depends on X86_32 && X86_SPEEDSTEP_CENTRINO
139 default y
140 help
141 Use built-in tables for Banias CPUs if ACPI encoding
142 is not available.
143
144 If in doubt, say N.
145
146config X86_SPEEDSTEP_ICH
147 tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
148 select CPU_FREQ_TABLE
149 depends on X86_32
150 help
151 This adds the CPUFreq driver for certain mobile Intel Pentium III
152 (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
153 mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
154 ICH3 or ICH4 southbridge.
155
156 For details, take a look at <file:Documentation/cpu-freq/>.
157
158 If in doubt, say N.
159
160config X86_SPEEDSTEP_SMI
161 tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
162 select CPU_FREQ_TABLE
163 depends on X86_32 && EXPERIMENTAL
164 help
165 This adds the CPUFreq driver for certain mobile Intel Pentium III
166 (Coppermine), all mobile Intel Pentium III-M (Tualatin)
167 on systems which have an Intel 440BX/ZX/MX southbridge.
168
169 For details, take a look at <file:Documentation/cpu-freq/>.
170
171 If in doubt, say N.
172
173config X86_P4_CLOCKMOD
174 tristate "Intel Pentium 4 clock modulation"
175 select CPU_FREQ_TABLE
176 help
177 This adds the CPUFreq driver for Intel Pentium 4 / XEON
178 processors. When enabled it will lower CPU temperature by skipping
179 clocks.
180
181 This driver should be only used in exceptional
182 circumstances when very low power is needed because it causes severe
183 slowdowns and noticeable latencies. Normally Speedstep should be used
184 instead.
185
186 To compile this driver as a module, choose M here: the
187 module will be called p4-clockmod.
188
189 For details, take a look at <file:Documentation/cpu-freq/>.
190
191 Unless you are absolutely sure say N.
192
193config X86_CPUFREQ_NFORCE2
194 tristate "nVidia nForce2 FSB changing"
195 depends on X86_32 && EXPERIMENTAL
196 help
197 This adds the CPUFreq driver for FSB changing on nVidia nForce2
198 platforms.
199
200 For details, take a look at <file:Documentation/cpu-freq/>.
201
202 If in doubt, say N.
203
204config X86_LONGRUN
205 tristate "Transmeta LongRun"
206 depends on X86_32
207 help
208 This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors
209 which support LongRun.
210
211 For details, take a look at <file:Documentation/cpu-freq/>.
212
213 If in doubt, say N.
214
215config X86_LONGHAUL
216 tristate "VIA Cyrix III Longhaul"
217 select CPU_FREQ_TABLE
218 depends on X86_32 && ACPI_PROCESSOR
219 help
220 This adds the CPUFreq driver for VIA Samuel/CyrixIII,
221 VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
222 processors.
223
224 For details, take a look at <file:Documentation/cpu-freq/>.
225
226 If in doubt, say N.
227
228config X86_E_POWERSAVER
229 tristate "VIA C7 Enhanced PowerSaver (DANGEROUS)"
230 select CPU_FREQ_TABLE
231 depends on X86_32 && EXPERIMENTAL
232 help
233 This adds the CPUFreq driver for VIA C7 processors. However, this driver
234 does not have any safeguards to prevent operating the CPU out of spec
235 and is thus considered dangerous. Please use the regular ACPI cpufreq
236 driver, enabled by CONFIG_X86_ACPI_CPUFREQ.
237
238 If in doubt, say N.
239
240comment "shared options"
241
242config X86_SPEEDSTEP_LIB
243 tristate
244 default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD)
245
246config X86_SPEEDSTEP_RELAXED_CAP_CHECK
247 bool "Relaxed speedstep capability checks"
248 depends on X86_32 && (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH)
249 help
250 Don't perform all checks for a speedstep capable system which would
251 normally be done. Some ancient or strange systems, though speedstep
252 capable, don't always indicate that they are speedstep capable. This
253 option lets the probing code bypass some of those checks if the
254 parameter "relaxed_check=1" is passed to the module.
255
1#
2# x86 CPU Frequency scaling drivers
3#
4
5config 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
20config 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
34config 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
50config 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
62config 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
72config 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
87config 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
98config 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
109config 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
119config 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
126config 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
138config 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
155config 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
166config 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
185config 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
195config 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
208config 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
220config 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
239config 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
250config 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
261config 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
273config 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
284comment "shared options"
285
286config X86_SPEEDSTEP_LIB
287 tristate
288 default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD)
289
290config 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