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1 menu "CPU Frequency scaling"
2
3 config CPU_FREQ
4 bool "CPU Frequency scaling"
5 help
6 CPU Frequency scaling allows you to change the clock speed of
7 CPUs on the fly. This is a nice method to save power, because
8 the lower the CPU clock speed, the less power the CPU consumes.
9
10 Note that this driver doesn't automatically change the CPU
11 clock speed, you need to either enable a dynamic cpufreq governor
12 (see below) after boot, or use a userspace tool.
13
14 For details, take a look at <file:Documentation/cpu-freq>.
15
16 If in doubt, say N.
17
18 if CPU_FREQ
19
20 config CPU_FREQ_GOV_COMMON
21 bool
22
23 config CPU_FREQ_BOOST_SW
24 bool
25 depends on THERMAL
26
27 config CPU_FREQ_STAT
28 tristate "CPU frequency translation statistics"
29 default y
30 help
31 This driver exports CPU frequency statistics information through sysfs
32 file system.
33
34 To compile this driver as a module, choose M here: the
35 module will be called cpufreq_stats.
36
37 If in doubt, say N.
38
39 config CPU_FREQ_STAT_DETAILS
40 bool "CPU frequency translation statistics details"
41 depends on CPU_FREQ_STAT
42 help
43 This will show detail CPU frequency translation table in sysfs file
44 system.
45
46 If in doubt, say N.
47
48 choice
49 prompt "Default CPUFreq governor"
50 default CPU_FREQ_DEFAULT_GOV_USERSPACE if ARM_SA1100_CPUFREQ || ARM_SA1110_CPUFREQ
51 default CPU_FREQ_DEFAULT_GOV_PERFORMANCE
52 help
53 This option sets which CPUFreq governor shall be loaded at
54 startup. If in doubt, select 'performance'.
55
56 config CPU_FREQ_DEFAULT_GOV_PERFORMANCE
57 bool "performance"
58 select CPU_FREQ_GOV_PERFORMANCE
59 help
60 Use the CPUFreq governor 'performance' as default. This sets
61 the frequency statically to the highest frequency supported by
62 the CPU.
63
64 config CPU_FREQ_DEFAULT_GOV_POWERSAVE
65 bool "powersave"
66 depends on EXPERT
67 select CPU_FREQ_GOV_POWERSAVE
68 help
69 Use the CPUFreq governor 'powersave' as default. This sets
70 the frequency statically to the lowest frequency supported by
71 the CPU.
72
73 config CPU_FREQ_DEFAULT_GOV_USERSPACE
74 bool "userspace"
75 select CPU_FREQ_GOV_USERSPACE
76 help
77 Use the CPUFreq governor 'userspace' as default. This allows
78 you to set the CPU frequency manually or when a userspace
79 program shall be able to set the CPU dynamically without having
80 to enable the userspace governor manually.
81
82 config CPU_FREQ_DEFAULT_GOV_ONDEMAND
83 bool "ondemand"
84 select CPU_FREQ_GOV_ONDEMAND
85 select CPU_FREQ_GOV_PERFORMANCE
86 help
87 Use the CPUFreq governor 'ondemand' as default. This allows
88 you to get a full dynamic frequency capable system by simply
89 loading your cpufreq low-level hardware driver.
90 Be aware that not all cpufreq drivers support the ondemand
91 governor. If unsure have a look at the help section of the
92 driver. Fallback governor will be the performance governor.
93
94 config CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
95 bool "conservative"
96 select CPU_FREQ_GOV_CONSERVATIVE
97 select CPU_FREQ_GOV_PERFORMANCE
98 help
99 Use the CPUFreq governor 'conservative' as default. This allows
100 you to get a full dynamic frequency capable system by simply
101 loading your cpufreq low-level hardware driver.
102 Be aware that not all cpufreq drivers support the conservative
103 governor. If unsure have a look at the help section of the
104 driver. Fallback governor will be the performance governor.
105 endchoice
106
107 config CPU_FREQ_GOV_PERFORMANCE
108 tristate "'performance' governor"
109 help
110 This cpufreq governor sets the frequency statically to the
111 highest available CPU frequency.
112
113 To compile this driver as a module, choose M here: the
114 module will be called cpufreq_performance.
115
116 If in doubt, say Y.
117
118 config CPU_FREQ_GOV_POWERSAVE
119 tristate "'powersave' governor"
120 help
121 This cpufreq governor sets the frequency statically to the
122 lowest available CPU frequency.
123
124 To compile this driver as a module, choose M here: the
125 module will be called cpufreq_powersave.
126
127 If in doubt, say Y.
128
129 config CPU_FREQ_GOV_USERSPACE
130 tristate "'userspace' governor for userspace frequency scaling"
131 help
132 Enable this cpufreq governor when you either want to set the
133 CPU frequency manually or when a userspace program shall
134 be able to set the CPU dynamically, like on LART
135 <http://www.lartmaker.nl/>.
136
137 To compile this driver as a module, choose M here: the
138 module will be called cpufreq_userspace.
139
140 For details, take a look at <file:Documentation/cpu-freq/>.
141
142 If in doubt, say Y.
143
144 config CPU_FREQ_GOV_ONDEMAND
145 tristate "'ondemand' cpufreq policy governor"
146 select CPU_FREQ_GOV_COMMON
147 help
148 'ondemand' - This driver adds a dynamic cpufreq policy governor.
149 The governor does a periodic polling and
150 changes frequency based on the CPU utilization.
151 The support for this governor depends on CPU capability to
152 do fast frequency switching (i.e, very low latency frequency
153 transitions).
154
155 To compile this driver as a module, choose M here: the
156 module will be called cpufreq_ondemand.
157
158 For details, take a look at linux/Documentation/cpu-freq.
159
160 If in doubt, say N.
161
162 config CPU_FREQ_GOV_CONSERVATIVE
163 tristate "'conservative' cpufreq governor"
164 depends on CPU_FREQ
165 select CPU_FREQ_GOV_COMMON
166 help
167 'conservative' - this driver is rather similar to the 'ondemand'
168 governor both in its source code and its purpose, the difference is
169 its optimisation for better suitability in a battery powered
170 environment. The frequency is gracefully increased and decreased
171 rather than jumping to 100% when speed is required.
172
173 If you have a desktop machine then you should really be considering
174 the 'ondemand' governor instead, however if you are using a laptop,
175 PDA or even an AMD64 based computer (due to the unacceptable
176 step-by-step latency issues between the minimum and maximum frequency
177 transitions in the CPU) you will probably want to use this governor.
178
179 To compile this driver as a module, choose M here: the
180 module will be called cpufreq_conservative.
181
182 For details, take a look at linux/Documentation/cpu-freq.
183
184 If in doubt, say N.
185
186 config GENERIC_CPUFREQ_CPU0
187 tristate "Generic CPU0 cpufreq driver"
188 depends on HAVE_CLK && REGULATOR && OF && THERMAL && CPU_THERMAL
189 select PM_OPP
190 help
191 This adds a generic cpufreq driver for CPU0 frequency management.
192 It supports both uniprocessor (UP) and symmetric multiprocessor (SMP)
193 systems which share clock and voltage across all CPUs.
194
195 If in doubt, say N.
196
197 menu "x86 CPU frequency scaling drivers"
198 depends on X86
199 source "drivers/cpufreq/Kconfig.x86"
200 endmenu
201
202 menu "ARM CPU frequency scaling drivers"
203 depends on ARM
204 source "drivers/cpufreq/Kconfig.arm"
205 endmenu
206
207 menu "AVR32 CPU frequency scaling drivers"
208 depends on AVR32
209
210 config AVR32_AT32AP_CPUFREQ
211 bool "CPU frequency driver for AT32AP"
212 depends on PLATFORM_AT32AP
213 default n
214 help
215 This enables the CPU frequency driver for AT32AP processors.
216 If in doubt, say N.
217
218 endmenu
219
220 menu "CPUFreq processor drivers"
221 depends on IA64
222
223 config IA64_ACPI_CPUFREQ
224 tristate "ACPI Processor P-States driver"
225 depends on ACPI_PROCESSOR
226 help
227 This driver adds a CPUFreq driver which utilizes the ACPI
228 Processor Performance States.
229
230 For details, take a look at <file:Documentation/cpu-freq/>.
231
232 If in doubt, say N.
233
234 endmenu
235
236 menu "MIPS CPUFreq processor drivers"
237 depends on MIPS
238
239 config LOONGSON2_CPUFREQ
240 tristate "Loongson2 CPUFreq Driver"
241 help
242 This option adds a CPUFreq driver for loongson processors which
243 support software configurable cpu frequency.
244
245 Loongson2F and it's successors support this feature.
246
247 For details, take a look at <file:Documentation/cpu-freq/>.
248
249 If in doubt, say N.
250
251 endmenu
252
253 menu "PowerPC CPU frequency scaling drivers"
254 depends on PPC32 || PPC64
255 source "drivers/cpufreq/Kconfig.powerpc"
256 endmenu
257
258 menu "SPARC CPU frequency scaling drivers"
259 depends on SPARC64
260 config SPARC_US3_CPUFREQ
261 tristate "UltraSPARC-III CPU Frequency driver"
262 help
263 This adds the CPUFreq driver for UltraSPARC-III processors.
264
265 For details, take a look at <file:Documentation/cpu-freq>.
266
267 If in doubt, say N.
268
269 config SPARC_US2E_CPUFREQ
270 tristate "UltraSPARC-IIe CPU Frequency driver"
271 help
272 This adds the CPUFreq driver for UltraSPARC-IIe processors.
273
274 For details, take a look at <file:Documentation/cpu-freq>.
275
276 If in doubt, say N.
277 endmenu
278
279 menu "SH CPU Frequency scaling"
280 depends on SUPERH
281 config SH_CPU_FREQ
282 tristate "SuperH CPU Frequency driver"
283 help
284 This adds the cpufreq driver for SuperH. Any CPU that supports
285 clock rate rounding through the clock framework can use this
286 driver. While it will make the kernel slightly larger, this is
287 harmless for CPUs that don't support rate rounding. The driver
288 will also generate a notice in the boot log before disabling
289 itself if the CPU in question is not capable of rate rounding.
290
291 For details, take a look at <file:Documentation/cpu-freq>.
292
293 If unsure, say N.
294 endmenu
295
296 endif
297 endmenu