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Commit | Line | Data |
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bb0a56ec DJ |
1 | menu "CPU Frequency scaling" |
2 | ||
1da177e4 LT |
3 | config CPU_FREQ |
4 | bool "CPU Frequency scaling" | |
83fe27ea | 5 | select SRCU |
1da177e4 LT |
6 | help |
7 | CPU Frequency scaling allows you to change the clock speed of | |
8 | CPUs on the fly. This is a nice method to save power, because | |
9 | the lower the CPU clock speed, the less power the CPU consumes. | |
10 | ||
11 | Note that this driver doesn't automatically change the CPU | |
12 | clock speed, you need to either enable a dynamic cpufreq governor | |
13 | (see below) after boot, or use a userspace tool. | |
14 | ||
15 | For details, take a look at <file:Documentation/cpu-freq>. | |
16 | ||
17 | If in doubt, say N. | |
18 | ||
19 | if CPU_FREQ | |
20 | ||
2d0c58ad RW |
21 | config CPU_FREQ_GOV_ATTR_SET |
22 | bool | |
23 | ||
1e15f295 | 24 | config CPU_FREQ_GOV_COMMON |
2d0c58ad | 25 | select CPU_FREQ_GOV_ATTR_SET |
e6f03657 | 26 | select IRQ_WORK |
1e15f295 LF |
27 | bool |
28 | ||
2fb4719b LM |
29 | config CPU_FREQ_BOOST_SW |
30 | bool | |
31 | depends on THERMAL | |
32 | ||
1da177e4 | 33 | config CPU_FREQ_STAT |
1aefc75b | 34 | bool "CPU frequency transition statistics" |
9101be53 MF |
35 | default y |
36 | help | |
1aefc75b | 37 | Export CPU frequency statistics information through sysfs. |
9101be53 MF |
38 | |
39 | If in doubt, say N. | |
1da177e4 LT |
40 | |
41 | config CPU_FREQ_STAT_DETAILS | |
1aefc75b | 42 | bool "CPU frequency transition statistics details" |
9101be53 MF |
43 | depends on CPU_FREQ_STAT |
44 | help | |
1aefc75b | 45 | Show detailed CPU frequency transition table in sysfs. |
9101be53 MF |
46 | |
47 | If in doubt, say N. | |
1da177e4 LT |
48 | |
49 | choice | |
50 | prompt "Default CPUFreq governor" | |
559f56c7 | 51 | default CPU_FREQ_DEFAULT_GOV_USERSPACE if ARM_SA1100_CPUFREQ || ARM_SA1110_CPUFREQ |
1da177e4 LT |
52 | default CPU_FREQ_DEFAULT_GOV_PERFORMANCE |
53 | help | |
54 | This option sets which CPUFreq governor shall be loaded at | |
55 | startup. If in doubt, select 'performance'. | |
56 | ||
57 | config CPU_FREQ_DEFAULT_GOV_PERFORMANCE | |
58 | bool "performance" | |
59 | select CPU_FREQ_GOV_PERFORMANCE | |
60 | help | |
61 | Use the CPUFreq governor 'performance' as default. This sets | |
62 | the frequency statically to the highest frequency supported by | |
63 | the CPU. | |
64 | ||
30d221db AG |
65 | config CPU_FREQ_DEFAULT_GOV_POWERSAVE |
66 | bool "powersave" | |
30d221db AG |
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 | ||
1da177e4 LT |
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 | |
0211a9c8 | 78 | you to set the CPU frequency manually or when a userspace |
1da177e4 LT |
79 | program shall be able to set the CPU dynamically without having |
80 | to enable the userspace governor manually. | |
81 | ||
1c256245 TR |
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. | |
9bdcb44e RW |
105 | |
106 | config CPU_FREQ_DEFAULT_GOV_SCHEDUTIL | |
107 | bool "schedutil" | |
cfe9492f | 108 | depends on SMP |
9bdcb44e RW |
109 | select CPU_FREQ_GOV_SCHEDUTIL |
110 | select CPU_FREQ_GOV_PERFORMANCE | |
111 | help | |
112 | Use the 'schedutil' CPUFreq governor by default. If unsure, | |
113 | have a look at the help section of that governor. The fallback | |
114 | governor will be 'performance'. | |
115 | ||
1da177e4 LT |
116 | endchoice |
117 | ||
118 | config CPU_FREQ_GOV_PERFORMANCE | |
9101be53 MF |
119 | tristate "'performance' governor" |
120 | help | |
1da177e4 LT |
121 | This cpufreq governor sets the frequency statically to the |
122 | highest available CPU frequency. | |
123 | ||
9101be53 MF |
124 | To compile this driver as a module, choose M here: the |
125 | module will be called cpufreq_performance. | |
126 | ||
1da177e4 LT |
127 | If in doubt, say Y. |
128 | ||
129 | config CPU_FREQ_GOV_POWERSAVE | |
9101be53 MF |
130 | tristate "'powersave' governor" |
131 | help | |
1da177e4 LT |
132 | This cpufreq governor sets the frequency statically to the |
133 | lowest available CPU frequency. | |
134 | ||
9101be53 MF |
135 | To compile this driver as a module, choose M here: the |
136 | module will be called cpufreq_powersave. | |
137 | ||
1da177e4 LT |
138 | If in doubt, say Y. |
139 | ||
140 | config CPU_FREQ_GOV_USERSPACE | |
9101be53 MF |
141 | tristate "'userspace' governor for userspace frequency scaling" |
142 | help | |
1da177e4 | 143 | Enable this cpufreq governor when you either want to set the |
0211a9c8 | 144 | CPU frequency manually or when a userspace program shall |
1da177e4 | 145 | be able to set the CPU dynamically, like on LART |
4c41251e | 146 | <http://www.lartmaker.nl/>. |
1da177e4 | 147 | |
9101be53 MF |
148 | To compile this driver as a module, choose M here: the |
149 | module will be called cpufreq_userspace. | |
150 | ||
1da177e4 LT |
151 | For details, take a look at <file:Documentation/cpu-freq/>. |
152 | ||
153 | If in doubt, say Y. | |
154 | ||
155 | config CPU_FREQ_GOV_ONDEMAND | |
156 | tristate "'ondemand' cpufreq policy governor" | |
1e15f295 | 157 | select CPU_FREQ_GOV_COMMON |
1da177e4 LT |
158 | help |
159 | 'ondemand' - This driver adds a dynamic cpufreq policy governor. | |
160 | The governor does a periodic polling and | |
161 | changes frequency based on the CPU utilization. | |
162 | The support for this governor depends on CPU capability to | |
163 | do fast frequency switching (i.e, very low latency frequency | |
164 | transitions). | |
165 | ||
9101be53 MF |
166 | To compile this driver as a module, choose M here: the |
167 | module will be called cpufreq_ondemand. | |
168 | ||
1da177e4 LT |
169 | For details, take a look at linux/Documentation/cpu-freq. |
170 | ||
171 | If in doubt, say N. | |
172 | ||
b9170836 DJ |
173 | config CPU_FREQ_GOV_CONSERVATIVE |
174 | tristate "'conservative' cpufreq governor" | |
175 | depends on CPU_FREQ | |
1e15f295 | 176 | select CPU_FREQ_GOV_COMMON |
b9170836 DJ |
177 | help |
178 | 'conservative' - this driver is rather similar to the 'ondemand' | |
179 | governor both in its source code and its purpose, the difference is | |
180 | its optimisation for better suitability in a battery powered | |
181 | environment. The frequency is gracefully increased and decreased | |
182 | rather than jumping to 100% when speed is required. | |
183 | ||
184 | If you have a desktop machine then you should really be considering | |
185 | the 'ondemand' governor instead, however if you are using a laptop, | |
186 | PDA or even an AMD64 based computer (due to the unacceptable | |
187 | step-by-step latency issues between the minimum and maximum frequency | |
188 | transitions in the CPU) you will probably want to use this governor. | |
189 | ||
9101be53 MF |
190 | To compile this driver as a module, choose M here: the |
191 | module will be called cpufreq_conservative. | |
192 | ||
b9170836 DJ |
193 | For details, take a look at linux/Documentation/cpu-freq. |
194 | ||
195 | If in doubt, say N. | |
196 | ||
9bdcb44e RW |
197 | config CPU_FREQ_GOV_SCHEDUTIL |
198 | tristate "'schedutil' cpufreq policy governor" | |
bf7cdff1 | 199 | depends on CPU_FREQ && SMP |
9bdcb44e RW |
200 | select CPU_FREQ_GOV_ATTR_SET |
201 | select IRQ_WORK | |
202 | help | |
203 | This governor makes decisions based on the utilization data provided | |
204 | by the scheduler. It sets the CPU frequency to be proportional to | |
205 | the utilization/capacity ratio coming from the scheduler. If the | |
206 | utilization is frequency-invariant, the new frequency is also | |
207 | proportional to the maximum available frequency. If that is not the | |
208 | case, it is proportional to the current frequency of the CPU. The | |
209 | frequency tipping point is at utilization/capacity equal to 80% in | |
210 | both cases. | |
211 | ||
212 | To compile this driver as a module, choose M here: the module will | |
213 | be called cpufreq_schedutil. | |
214 | ||
215 | If in doubt, say N. | |
216 | ||
f41f4815 VK |
217 | comment "CPU frequency scaling drivers" |
218 | ||
bbcf0719 VK |
219 | config CPUFREQ_DT |
220 | tristate "Generic DT based cpufreq driver" | |
5fbfbcd3 | 221 | depends on HAVE_CLK && OF |
bbcf0719 | 222 | # if CPU_THERMAL is on and THERMAL=m, CPUFREQ_DT cannot be =y: |
217886d3 | 223 | depends on !CPU_THERMAL || THERMAL |
f56aad1d | 224 | select CPUFREQ_DT_PLATDEV |
109df086 | 225 | select PM_OPP |
95ceafd4 | 226 | help |
bbcf0719 | 227 | This adds a generic DT based cpufreq driver for frequency management. |
95ceafd4 SG |
228 | It supports both uniprocessor (UP) and symmetric multiprocessor (SMP) |
229 | systems which share clock and voltage across all CPUs. | |
230 | ||
231 | If in doubt, say N. | |
232 | ||
f56aad1d VK |
233 | config CPUFREQ_DT_PLATDEV |
234 | bool | |
235 | help | |
236 | This adds a generic DT based cpufreq platdev driver for frequency | |
237 | management. This creates a 'cpufreq-dt' platform device, on the | |
238 | supported platforms. | |
239 | ||
240 | If in doubt, say N. | |
241 | ||
f41f4815 | 242 | if X86 |
bb0a56ec | 243 | source "drivers/cpufreq/Kconfig.x86" |
f41f4815 | 244 | endif |
bb0a56ec | 245 | |
f41f4815 | 246 | if ARM || ARM64 |
f7d77079 | 247 | source "drivers/cpufreq/Kconfig.arm" |
f41f4815 | 248 | endif |
f7d77079 | 249 | |
f41f4815 VK |
250 | if PPC32 || PPC64 |
251 | source "drivers/cpufreq/Kconfig.powerpc" | |
252 | endif | |
81c720c9 | 253 | |
f41f4815 | 254 | if AVR32 |
81c720c9 VK |
255 | config AVR32_AT32AP_CPUFREQ |
256 | bool "CPU frequency driver for AT32AP" | |
257 | depends on PLATFORM_AT32AP | |
258 | default n | |
259 | help | |
260 | This enables the CPU frequency driver for AT32AP processors. | |
261 | If in doubt, say N. | |
f41f4815 | 262 | endif |
81c720c9 | 263 | |
f41f4815 | 264 | if IA64 |
ab423e43 VK |
265 | config IA64_ACPI_CPUFREQ |
266 | tristate "ACPI Processor P-States driver" | |
ab423e43 VK |
267 | depends on ACPI_PROCESSOR |
268 | help | |
269 | This driver adds a CPUFreq driver which utilizes the ACPI | |
270 | Processor Performance States. | |
271 | ||
272 | For details, take a look at <file:Documentation/cpu-freq/>. | |
273 | ||
274 | If in doubt, say N. | |
f41f4815 | 275 | endif |
ab423e43 | 276 | |
f41f4815 | 277 | if MIPS |
7a998935 VK |
278 | config LOONGSON2_CPUFREQ |
279 | tristate "Loongson2 CPUFreq Driver" | |
7a998935 VK |
280 | help |
281 | This option adds a CPUFreq driver for loongson processors which | |
282 | support software configurable cpu frequency. | |
283 | ||
284 | Loongson2F and it's successors support this feature. | |
285 | ||
286 | For details, take a look at <file:Documentation/cpu-freq/>. | |
287 | ||
288 | If in doubt, say N. | |
289 | ||
a0a22cf1 KC |
290 | config LOONGSON1_CPUFREQ |
291 | tristate "Loongson1 CPUFreq Driver" | |
292 | help | |
293 | This option adds a CPUFreq driver for loongson1 processors which | |
294 | support software configurable cpu frequency. | |
295 | ||
296 | For details, take a look at <file:Documentation/cpu-freq/>. | |
297 | ||
298 | If in doubt, say N. | |
f41f4815 | 299 | endif |
a0a22cf1 | 300 | |
f41f4815 | 301 | if SPARC64 |
764295ae VK |
302 | config SPARC_US3_CPUFREQ |
303 | tristate "UltraSPARC-III CPU Frequency driver" | |
764295ae VK |
304 | help |
305 | This adds the CPUFreq driver for UltraSPARC-III processors. | |
306 | ||
307 | For details, take a look at <file:Documentation/cpu-freq>. | |
308 | ||
309 | If in doubt, say N. | |
310 | ||
311 | config SPARC_US2E_CPUFREQ | |
312 | tristate "UltraSPARC-IIe CPU Frequency driver" | |
764295ae VK |
313 | help |
314 | This adds the CPUFreq driver for UltraSPARC-IIe processors. | |
315 | ||
316 | For details, take a look at <file:Documentation/cpu-freq>. | |
317 | ||
318 | If in doubt, say N. | |
f41f4815 | 319 | endif |
764295ae | 320 | |
f41f4815 | 321 | if SUPERH |
7258267e VK |
322 | config SH_CPU_FREQ |
323 | tristate "SuperH CPU Frequency driver" | |
7258267e VK |
324 | help |
325 | This adds the cpufreq driver for SuperH. Any CPU that supports | |
326 | clock rate rounding through the clock framework can use this | |
327 | driver. While it will make the kernel slightly larger, this is | |
328 | harmless for CPUs that don't support rate rounding. The driver | |
329 | will also generate a notice in the boot log before disabling | |
330 | itself if the CPU in question is not capable of rate rounding. | |
331 | ||
332 | For details, take a look at <file:Documentation/cpu-freq>. | |
333 | ||
334 | If unsure, say N. | |
f41f4815 | 335 | endif |
7258267e | 336 | |
2f249358 TY |
337 | config QORIQ_CPUFREQ |
338 | tristate "CPU frequency scaling driver for Freescale QorIQ SoCs" | |
339 | depends on OF && COMMON_CLK && (PPC_E500MC || ARM) | |
ddd30ef4 | 340 | depends on !CPU_THERMAL || THERMAL |
2f249358 TY |
341 | select CLK_QORIQ |
342 | help | |
343 | This adds the CPUFreq driver support for Freescale QorIQ SoCs | |
344 | which are capable of changing the CPU's frequency dynamically. | |
345 | ||
bb0a56ec DJ |
346 | endif |
347 | endmenu |