]>
Commit | Line | Data |
---|---|---|
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 | 35 | help |
1aefc75b | 36 | Export CPU frequency statistics information through sysfs. |
9101be53 MF |
37 | |
38 | If in doubt, say N. | |
1da177e4 LT |
39 | |
40 | config CPU_FREQ_STAT_DETAILS | |
1aefc75b | 41 | bool "CPU frequency transition statistics details" |
9101be53 MF |
42 | depends on CPU_FREQ_STAT |
43 | help | |
1aefc75b | 44 | Show detailed CPU frequency transition table in sysfs. |
9101be53 MF |
45 | |
46 | If in doubt, say N. | |
1da177e4 LT |
47 | |
48 | choice | |
49 | prompt "Default CPUFreq governor" | |
559f56c7 | 50 | default CPU_FREQ_DEFAULT_GOV_USERSPACE if ARM_SA1100_CPUFREQ || ARM_SA1110_CPUFREQ |
1da177e4 LT |
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 | ||
30d221db AG |
64 | config CPU_FREQ_DEFAULT_GOV_POWERSAVE |
65 | bool "powersave" | |
30d221db AG |
66 | select CPU_FREQ_GOV_POWERSAVE |
67 | help | |
68 | Use the CPUFreq governor 'powersave' as default. This sets | |
69 | the frequency statically to the lowest frequency supported by | |
70 | the CPU. | |
71 | ||
1da177e4 LT |
72 | config CPU_FREQ_DEFAULT_GOV_USERSPACE |
73 | bool "userspace" | |
74 | select CPU_FREQ_GOV_USERSPACE | |
75 | help | |
76 | Use the CPUFreq governor 'userspace' as default. This allows | |
0211a9c8 | 77 | you to set the CPU frequency manually or when a userspace |
1da177e4 LT |
78 | program shall be able to set the CPU dynamically without having |
79 | to enable the userspace governor manually. | |
80 | ||
1c256245 TR |
81 | config CPU_FREQ_DEFAULT_GOV_ONDEMAND |
82 | bool "ondemand" | |
83 | select CPU_FREQ_GOV_ONDEMAND | |
84 | select CPU_FREQ_GOV_PERFORMANCE | |
85 | help | |
86 | Use the CPUFreq governor 'ondemand' as default. This allows | |
87 | you to get a full dynamic frequency capable system by simply | |
88 | loading your cpufreq low-level hardware driver. | |
89 | Be aware that not all cpufreq drivers support the ondemand | |
90 | governor. If unsure have a look at the help section of the | |
91 | driver. Fallback governor will be the performance governor. | |
92 | ||
93 | config CPU_FREQ_DEFAULT_GOV_CONSERVATIVE | |
94 | bool "conservative" | |
95 | select CPU_FREQ_GOV_CONSERVATIVE | |
96 | select CPU_FREQ_GOV_PERFORMANCE | |
97 | help | |
98 | Use the CPUFreq governor 'conservative' as default. This allows | |
99 | you to get a full dynamic frequency capable system by simply | |
100 | loading your cpufreq low-level hardware driver. | |
101 | Be aware that not all cpufreq drivers support the conservative | |
102 | governor. If unsure have a look at the help section of the | |
103 | driver. Fallback governor will be the performance governor. | |
9bdcb44e RW |
104 | |
105 | config CPU_FREQ_DEFAULT_GOV_SCHEDUTIL | |
106 | bool "schedutil" | |
cfe9492f | 107 | depends on SMP |
9bdcb44e RW |
108 | select CPU_FREQ_GOV_SCHEDUTIL |
109 | select CPU_FREQ_GOV_PERFORMANCE | |
110 | help | |
111 | Use the 'schedutil' CPUFreq governor by default. If unsure, | |
112 | have a look at the help section of that governor. The fallback | |
113 | governor will be 'performance'. | |
114 | ||
1da177e4 LT |
115 | endchoice |
116 | ||
117 | config CPU_FREQ_GOV_PERFORMANCE | |
9101be53 MF |
118 | tristate "'performance' governor" |
119 | help | |
1da177e4 LT |
120 | This cpufreq governor sets the frequency statically to the |
121 | highest available CPU frequency. | |
122 | ||
9101be53 MF |
123 | To compile this driver as a module, choose M here: the |
124 | module will be called cpufreq_performance. | |
125 | ||
1da177e4 LT |
126 | If in doubt, say Y. |
127 | ||
128 | config CPU_FREQ_GOV_POWERSAVE | |
9101be53 MF |
129 | tristate "'powersave' governor" |
130 | help | |
1da177e4 LT |
131 | This cpufreq governor sets the frequency statically to the |
132 | lowest available CPU frequency. | |
133 | ||
9101be53 MF |
134 | To compile this driver as a module, choose M here: the |
135 | module will be called cpufreq_powersave. | |
136 | ||
1da177e4 LT |
137 | If in doubt, say Y. |
138 | ||
139 | config CPU_FREQ_GOV_USERSPACE | |
9101be53 MF |
140 | tristate "'userspace' governor for userspace frequency scaling" |
141 | help | |
1da177e4 | 142 | Enable this cpufreq governor when you either want to set the |
0211a9c8 | 143 | CPU frequency manually or when a userspace program shall |
1da177e4 | 144 | be able to set the CPU dynamically, like on LART |
4c41251e | 145 | <http://www.lartmaker.nl/>. |
1da177e4 | 146 | |
9101be53 MF |
147 | To compile this driver as a module, choose M here: the |
148 | module will be called cpufreq_userspace. | |
149 | ||
1da177e4 LT |
150 | For details, take a look at <file:Documentation/cpu-freq/>. |
151 | ||
152 | If in doubt, say Y. | |
153 | ||
154 | config CPU_FREQ_GOV_ONDEMAND | |
155 | tristate "'ondemand' cpufreq policy governor" | |
1e15f295 | 156 | select CPU_FREQ_GOV_COMMON |
1da177e4 LT |
157 | help |
158 | 'ondemand' - This driver adds a dynamic cpufreq policy governor. | |
159 | The governor does a periodic polling and | |
160 | changes frequency based on the CPU utilization. | |
161 | The support for this governor depends on CPU capability to | |
162 | do fast frequency switching (i.e, very low latency frequency | |
163 | transitions). | |
164 | ||
9101be53 MF |
165 | To compile this driver as a module, choose M here: the |
166 | module will be called cpufreq_ondemand. | |
167 | ||
1da177e4 LT |
168 | For details, take a look at linux/Documentation/cpu-freq. |
169 | ||
170 | If in doubt, say N. | |
171 | ||
b9170836 DJ |
172 | config CPU_FREQ_GOV_CONSERVATIVE |
173 | tristate "'conservative' cpufreq governor" | |
174 | depends on CPU_FREQ | |
1e15f295 | 175 | select CPU_FREQ_GOV_COMMON |
b9170836 DJ |
176 | help |
177 | 'conservative' - this driver is rather similar to the 'ondemand' | |
178 | governor both in its source code and its purpose, the difference is | |
179 | its optimisation for better suitability in a battery powered | |
180 | environment. The frequency is gracefully increased and decreased | |
181 | rather than jumping to 100% when speed is required. | |
182 | ||
183 | If you have a desktop machine then you should really be considering | |
184 | the 'ondemand' governor instead, however if you are using a laptop, | |
185 | PDA or even an AMD64 based computer (due to the unacceptable | |
186 | step-by-step latency issues between the minimum and maximum frequency | |
187 | transitions in the CPU) you will probably want to use this governor. | |
188 | ||
9101be53 MF |
189 | To compile this driver as a module, choose M here: the |
190 | module will be called cpufreq_conservative. | |
191 | ||
b9170836 DJ |
192 | For details, take a look at linux/Documentation/cpu-freq. |
193 | ||
194 | If in doubt, say N. | |
195 | ||
9bdcb44e | 196 | config CPU_FREQ_GOV_SCHEDUTIL |
58919e83 | 197 | bool "'schedutil' cpufreq policy governor" |
bf7cdff1 | 198 | depends on CPU_FREQ && SMP |
9bdcb44e RW |
199 | select CPU_FREQ_GOV_ATTR_SET |
200 | select IRQ_WORK | |
201 | help | |
202 | This governor makes decisions based on the utilization data provided | |
203 | by the scheduler. It sets the CPU frequency to be proportional to | |
204 | the utilization/capacity ratio coming from the scheduler. If the | |
205 | utilization is frequency-invariant, the new frequency is also | |
206 | proportional to the maximum available frequency. If that is not the | |
207 | case, it is proportional to the current frequency of the CPU. The | |
208 | frequency tipping point is at utilization/capacity equal to 80% in | |
209 | both cases. | |
210 | ||
9bdcb44e RW |
211 | If in doubt, say N. |
212 | ||
f41f4815 VK |
213 | comment "CPU frequency scaling drivers" |
214 | ||
bbcf0719 VK |
215 | config CPUFREQ_DT |
216 | tristate "Generic DT based cpufreq driver" | |
5fbfbcd3 | 217 | depends on HAVE_CLK && OF |
bbcf0719 | 218 | # if CPU_THERMAL is on and THERMAL=m, CPUFREQ_DT cannot be =y: |
217886d3 | 219 | depends on !CPU_THERMAL || THERMAL |
f56aad1d | 220 | select CPUFREQ_DT_PLATDEV |
109df086 | 221 | select PM_OPP |
95ceafd4 | 222 | help |
bbcf0719 | 223 | This adds a generic DT based cpufreq driver for frequency management. |
95ceafd4 | 224 | It supports both uniprocessor (UP) and symmetric multiprocessor (SMP) |
33cc4fc1 | 225 | systems. |
95ceafd4 SG |
226 | |
227 | If in doubt, say N. | |
228 | ||
f56aad1d VK |
229 | config CPUFREQ_DT_PLATDEV |
230 | bool | |
231 | help | |
232 | This adds a generic DT based cpufreq platdev driver for frequency | |
233 | management. This creates a 'cpufreq-dt' platform device, on the | |
234 | supported platforms. | |
235 | ||
236 | If in doubt, say N. | |
237 | ||
f41f4815 | 238 | if X86 |
bb0a56ec | 239 | source "drivers/cpufreq/Kconfig.x86" |
f41f4815 | 240 | endif |
bb0a56ec | 241 | |
f41f4815 | 242 | if ARM || ARM64 |
f7d77079 | 243 | source "drivers/cpufreq/Kconfig.arm" |
f41f4815 | 244 | endif |
f7d77079 | 245 | |
f41f4815 VK |
246 | if PPC32 || PPC64 |
247 | source "drivers/cpufreq/Kconfig.powerpc" | |
248 | endif | |
81c720c9 | 249 | |
f41f4815 | 250 | if AVR32 |
81c720c9 VK |
251 | config AVR32_AT32AP_CPUFREQ |
252 | bool "CPU frequency driver for AT32AP" | |
253 | depends on PLATFORM_AT32AP | |
254 | default n | |
255 | help | |
256 | This enables the CPU frequency driver for AT32AP processors. | |
257 | If in doubt, say N. | |
f41f4815 | 258 | endif |
81c720c9 | 259 | |
f41f4815 | 260 | if IA64 |
ab423e43 VK |
261 | config IA64_ACPI_CPUFREQ |
262 | tristate "ACPI Processor P-States driver" | |
ab423e43 VK |
263 | depends on ACPI_PROCESSOR |
264 | help | |
265 | This driver adds a CPUFreq driver which utilizes the ACPI | |
266 | Processor Performance States. | |
267 | ||
268 | For details, take a look at <file:Documentation/cpu-freq/>. | |
269 | ||
270 | If in doubt, say N. | |
f41f4815 | 271 | endif |
ab423e43 | 272 | |
f41f4815 | 273 | if MIPS |
7a998935 VK |
274 | config LOONGSON2_CPUFREQ |
275 | tristate "Loongson2 CPUFreq Driver" | |
7a998935 VK |
276 | help |
277 | This option adds a CPUFreq driver for loongson processors which | |
278 | support software configurable cpu frequency. | |
279 | ||
280 | Loongson2F and it's successors support this feature. | |
281 | ||
282 | For details, take a look at <file:Documentation/cpu-freq/>. | |
283 | ||
284 | If in doubt, say N. | |
285 | ||
a0a22cf1 KC |
286 | config LOONGSON1_CPUFREQ |
287 | tristate "Loongson1 CPUFreq Driver" | |
288 | help | |
289 | This option adds a CPUFreq driver for loongson1 processors which | |
290 | support software configurable cpu frequency. | |
291 | ||
292 | For details, take a look at <file:Documentation/cpu-freq/>. | |
293 | ||
294 | If in doubt, say N. | |
f41f4815 | 295 | endif |
a0a22cf1 | 296 | |
f41f4815 | 297 | if SPARC64 |
764295ae VK |
298 | config SPARC_US3_CPUFREQ |
299 | tristate "UltraSPARC-III CPU Frequency driver" | |
764295ae VK |
300 | help |
301 | This adds the CPUFreq driver for UltraSPARC-III processors. | |
302 | ||
303 | For details, take a look at <file:Documentation/cpu-freq>. | |
304 | ||
305 | If in doubt, say N. | |
306 | ||
307 | config SPARC_US2E_CPUFREQ | |
308 | tristate "UltraSPARC-IIe CPU Frequency driver" | |
764295ae VK |
309 | help |
310 | This adds the CPUFreq driver for UltraSPARC-IIe processors. | |
311 | ||
312 | For details, take a look at <file:Documentation/cpu-freq>. | |
313 | ||
314 | If in doubt, say N. | |
f41f4815 | 315 | endif |
764295ae | 316 | |
f41f4815 | 317 | if SUPERH |
7258267e VK |
318 | config SH_CPU_FREQ |
319 | tristate "SuperH CPU Frequency driver" | |
7258267e VK |
320 | help |
321 | This adds the cpufreq driver for SuperH. Any CPU that supports | |
322 | clock rate rounding through the clock framework can use this | |
323 | driver. While it will make the kernel slightly larger, this is | |
324 | harmless for CPUs that don't support rate rounding. The driver | |
325 | will also generate a notice in the boot log before disabling | |
326 | itself if the CPU in question is not capable of rate rounding. | |
327 | ||
328 | For details, take a look at <file:Documentation/cpu-freq>. | |
329 | ||
330 | If unsure, say N. | |
f41f4815 | 331 | endif |
7258267e | 332 | |
2f249358 TY |
333 | config QORIQ_CPUFREQ |
334 | tristate "CPU frequency scaling driver for Freescale QorIQ SoCs" | |
335 | depends on OF && COMMON_CLK && (PPC_E500MC || ARM) | |
ddd30ef4 | 336 | depends on !CPU_THERMAL || THERMAL |
2f249358 TY |
337 | select CLK_QORIQ |
338 | help | |
339 | This adds the CPUFreq driver support for Freescale QorIQ SoCs | |
340 | which are capable of changing the CPU's frequency dynamically. | |
341 | ||
bb0a56ec DJ |
342 | endif |
343 | endmenu |