Commit | Line | Data |
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ec8f24b7 | 1 | # SPDX-License-Identifier: GPL-2.0-only |
bb0a56ec DJ |
2 | menu "CPU Frequency scaling" |
3 | ||
1da177e4 LT |
4 | config CPU_FREQ |
5 | bool "CPU Frequency scaling" | |
83fe27ea | 6 | select SRCU |
1da177e4 LT |
7 | help |
8 | CPU Frequency scaling allows you to change the clock speed of | |
9 | CPUs on the fly. This is a nice method to save power, because | |
10 | the lower the CPU clock speed, the less power the CPU consumes. | |
11 | ||
12 | Note that this driver doesn't automatically change the CPU | |
13 | clock speed, you need to either enable a dynamic cpufreq governor | |
14 | (see below) after boot, or use a userspace tool. | |
15 | ||
16 | For details, take a look at <file:Documentation/cpu-freq>. | |
17 | ||
18 | If in doubt, say N. | |
19 | ||
20 | if CPU_FREQ | |
21 | ||
2d0c58ad RW |
22 | config CPU_FREQ_GOV_ATTR_SET |
23 | bool | |
24 | ||
1e15f295 | 25 | config CPU_FREQ_GOV_COMMON |
2d0c58ad | 26 | select CPU_FREQ_GOV_ATTR_SET |
e6f03657 | 27 | select IRQ_WORK |
1e15f295 LF |
28 | bool |
29 | ||
1da177e4 | 30 | config CPU_FREQ_STAT |
1aefc75b | 31 | bool "CPU frequency transition statistics" |
9101be53 | 32 | help |
1aefc75b | 33 | Export CPU frequency statistics information through sysfs. |
9101be53 MF |
34 | |
35 | If in doubt, say N. | |
1da177e4 | 36 | |
1da177e4 LT |
37 | choice |
38 | prompt "Default CPUFreq governor" | |
559f56c7 | 39 | default CPU_FREQ_DEFAULT_GOV_USERSPACE if ARM_SA1100_CPUFREQ || ARM_SA1110_CPUFREQ |
1da177e4 LT |
40 | default CPU_FREQ_DEFAULT_GOV_PERFORMANCE |
41 | help | |
42 | This option sets which CPUFreq governor shall be loaded at | |
43 | startup. If in doubt, select 'performance'. | |
44 | ||
45 | config CPU_FREQ_DEFAULT_GOV_PERFORMANCE | |
46 | bool "performance" | |
47 | select CPU_FREQ_GOV_PERFORMANCE | |
48 | help | |
49 | Use the CPUFreq governor 'performance' as default. This sets | |
50 | the frequency statically to the highest frequency supported by | |
51 | the CPU. | |
52 | ||
30d221db AG |
53 | config CPU_FREQ_DEFAULT_GOV_POWERSAVE |
54 | bool "powersave" | |
30d221db AG |
55 | select CPU_FREQ_GOV_POWERSAVE |
56 | help | |
57 | Use the CPUFreq governor 'powersave' as default. This sets | |
58 | the frequency statically to the lowest frequency supported by | |
59 | the CPU. | |
60 | ||
1da177e4 LT |
61 | config CPU_FREQ_DEFAULT_GOV_USERSPACE |
62 | bool "userspace" | |
63 | select CPU_FREQ_GOV_USERSPACE | |
64 | help | |
65 | Use the CPUFreq governor 'userspace' as default. This allows | |
0211a9c8 | 66 | you to set the CPU frequency manually or when a userspace |
1da177e4 LT |
67 | program shall be able to set the CPU dynamically without having |
68 | to enable the userspace governor manually. | |
69 | ||
1c256245 TR |
70 | config CPU_FREQ_DEFAULT_GOV_ONDEMAND |
71 | bool "ondemand" | |
72 | select CPU_FREQ_GOV_ONDEMAND | |
73 | select CPU_FREQ_GOV_PERFORMANCE | |
74 | help | |
75 | Use the CPUFreq governor 'ondemand' as default. This allows | |
76 | you to get a full dynamic frequency capable system by simply | |
77 | loading your cpufreq low-level hardware driver. | |
78 | Be aware that not all cpufreq drivers support the ondemand | |
79 | governor. If unsure have a look at the help section of the | |
80 | driver. Fallback governor will be the performance governor. | |
81 | ||
82 | config CPU_FREQ_DEFAULT_GOV_CONSERVATIVE | |
83 | bool "conservative" | |
84 | select CPU_FREQ_GOV_CONSERVATIVE | |
85 | select CPU_FREQ_GOV_PERFORMANCE | |
86 | help | |
87 | Use the CPUFreq governor 'conservative' 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 conservative | |
91 | governor. If unsure have a look at the help section of the | |
92 | driver. Fallback governor will be the performance governor. | |
9bdcb44e RW |
93 | |
94 | config CPU_FREQ_DEFAULT_GOV_SCHEDUTIL | |
95 | bool "schedutil" | |
cfe9492f | 96 | depends on SMP |
9bdcb44e RW |
97 | select CPU_FREQ_GOV_SCHEDUTIL |
98 | select CPU_FREQ_GOV_PERFORMANCE | |
99 | help | |
100 | Use the 'schedutil' CPUFreq governor by default. If unsure, | |
101 | have a look at the help section of that governor. The fallback | |
102 | governor will be 'performance'. | |
103 | ||
1da177e4 LT |
104 | endchoice |
105 | ||
106 | config CPU_FREQ_GOV_PERFORMANCE | |
9101be53 MF |
107 | tristate "'performance' governor" |
108 | help | |
1da177e4 LT |
109 | This cpufreq governor sets the frequency statically to the |
110 | highest available CPU frequency. | |
111 | ||
9101be53 MF |
112 | To compile this driver as a module, choose M here: the |
113 | module will be called cpufreq_performance. | |
114 | ||
1da177e4 LT |
115 | If in doubt, say Y. |
116 | ||
117 | config CPU_FREQ_GOV_POWERSAVE | |
9101be53 MF |
118 | tristate "'powersave' governor" |
119 | help | |
1da177e4 LT |
120 | This cpufreq governor sets the frequency statically to the |
121 | lowest available CPU frequency. | |
122 | ||
9101be53 MF |
123 | To compile this driver as a module, choose M here: the |
124 | module will be called cpufreq_powersave. | |
125 | ||
1da177e4 LT |
126 | If in doubt, say Y. |
127 | ||
128 | config CPU_FREQ_GOV_USERSPACE | |
9101be53 MF |
129 | tristate "'userspace' governor for userspace frequency scaling" |
130 | help | |
1da177e4 | 131 | Enable this cpufreq governor when you either want to set the |
0211a9c8 | 132 | CPU frequency manually or when a userspace program shall |
1da177e4 | 133 | be able to set the CPU dynamically, like on LART |
4c41251e | 134 | <http://www.lartmaker.nl/>. |
1da177e4 | 135 | |
9101be53 MF |
136 | To compile this driver as a module, choose M here: the |
137 | module will be called cpufreq_userspace. | |
138 | ||
1da177e4 LT |
139 | For details, take a look at <file:Documentation/cpu-freq/>. |
140 | ||
141 | If in doubt, say Y. | |
142 | ||
143 | config CPU_FREQ_GOV_ONDEMAND | |
144 | tristate "'ondemand' cpufreq policy governor" | |
1e15f295 | 145 | select CPU_FREQ_GOV_COMMON |
1da177e4 LT |
146 | help |
147 | 'ondemand' - This driver adds a dynamic cpufreq policy governor. | |
148 | The governor does a periodic polling and | |
149 | changes frequency based on the CPU utilization. | |
150 | The support for this governor depends on CPU capability to | |
151 | do fast frequency switching (i.e, very low latency frequency | |
152 | transitions). | |
153 | ||
9101be53 MF |
154 | To compile this driver as a module, choose M here: the |
155 | module will be called cpufreq_ondemand. | |
156 | ||
1da177e4 LT |
157 | For details, take a look at linux/Documentation/cpu-freq. |
158 | ||
159 | If in doubt, say N. | |
160 | ||
b9170836 DJ |
161 | config CPU_FREQ_GOV_CONSERVATIVE |
162 | tristate "'conservative' cpufreq governor" | |
163 | depends on CPU_FREQ | |
1e15f295 | 164 | select CPU_FREQ_GOV_COMMON |
b9170836 DJ |
165 | help |
166 | 'conservative' - this driver is rather similar to the 'ondemand' | |
167 | governor both in its source code and its purpose, the difference is | |
168 | its optimisation for better suitability in a battery powered | |
169 | environment. The frequency is gracefully increased and decreased | |
170 | rather than jumping to 100% when speed is required. | |
171 | ||
172 | If you have a desktop machine then you should really be considering | |
173 | the 'ondemand' governor instead, however if you are using a laptop, | |
174 | PDA or even an AMD64 based computer (due to the unacceptable | |
175 | step-by-step latency issues between the minimum and maximum frequency | |
176 | transitions in the CPU) you will probably want to use this governor. | |
177 | ||
9101be53 MF |
178 | To compile this driver as a module, choose M here: the |
179 | module will be called cpufreq_conservative. | |
180 | ||
b9170836 DJ |
181 | For details, take a look at linux/Documentation/cpu-freq. |
182 | ||
183 | If in doubt, say N. | |
184 | ||
9bdcb44e | 185 | config CPU_FREQ_GOV_SCHEDUTIL |
58919e83 | 186 | bool "'schedutil' cpufreq policy governor" |
bf7cdff1 | 187 | depends on CPU_FREQ && SMP |
9bdcb44e RW |
188 | select CPU_FREQ_GOV_ATTR_SET |
189 | select IRQ_WORK | |
190 | help | |
191 | This governor makes decisions based on the utilization data provided | |
192 | by the scheduler. It sets the CPU frequency to be proportional to | |
193 | the utilization/capacity ratio coming from the scheduler. If the | |
194 | utilization is frequency-invariant, the new frequency is also | |
195 | proportional to the maximum available frequency. If that is not the | |
196 | case, it is proportional to the current frequency of the CPU. The | |
197 | frequency tipping point is at utilization/capacity equal to 80% in | |
198 | both cases. | |
199 | ||
9bdcb44e RW |
200 | If in doubt, say N. |
201 | ||
f41f4815 VK |
202 | comment "CPU frequency scaling drivers" |
203 | ||
bbcf0719 VK |
204 | config CPUFREQ_DT |
205 | tristate "Generic DT based cpufreq driver" | |
5fbfbcd3 | 206 | depends on HAVE_CLK && OF |
f56aad1d | 207 | select CPUFREQ_DT_PLATDEV |
109df086 | 208 | select PM_OPP |
95ceafd4 | 209 | help |
bbcf0719 | 210 | This adds a generic DT based cpufreq driver for frequency management. |
95ceafd4 | 211 | It supports both uniprocessor (UP) and symmetric multiprocessor (SMP) |
33cc4fc1 | 212 | systems. |
95ceafd4 SG |
213 | |
214 | If in doubt, say N. | |
215 | ||
f56aad1d VK |
216 | config CPUFREQ_DT_PLATDEV |
217 | bool | |
218 | help | |
219 | This adds a generic DT based cpufreq platdev driver for frequency | |
220 | management. This creates a 'cpufreq-dt' platform device, on the | |
221 | supported platforms. | |
222 | ||
223 | If in doubt, say N. | |
224 | ||
f41f4815 | 225 | if X86 |
bb0a56ec | 226 | source "drivers/cpufreq/Kconfig.x86" |
f41f4815 | 227 | endif |
bb0a56ec | 228 | |
f41f4815 | 229 | if ARM || ARM64 |
f7d77079 | 230 | source "drivers/cpufreq/Kconfig.arm" |
f41f4815 | 231 | endif |
f7d77079 | 232 | |
f41f4815 VK |
233 | if PPC32 || PPC64 |
234 | source "drivers/cpufreq/Kconfig.powerpc" | |
235 | endif | |
81c720c9 | 236 | |
f41f4815 | 237 | if IA64 |
ab423e43 VK |
238 | config IA64_ACPI_CPUFREQ |
239 | tristate "ACPI Processor P-States driver" | |
ab423e43 VK |
240 | depends on ACPI_PROCESSOR |
241 | help | |
242 | This driver adds a CPUFreq driver which utilizes the ACPI | |
243 | Processor Performance States. | |
244 | ||
245 | For details, take a look at <file:Documentation/cpu-freq/>. | |
246 | ||
247 | If in doubt, say N. | |
f41f4815 | 248 | endif |
ab423e43 | 249 | |
f41f4815 | 250 | if MIPS |
cdb56cbf MM |
251 | config BMIPS_CPUFREQ |
252 | tristate "BMIPS CPUfreq Driver" | |
253 | help | |
254 | This option adds a CPUfreq driver for BMIPS processors with | |
255 | support for configurable CPU frequency. | |
256 | ||
257 | For now, BMIPS5 chips are supported (such as the Broadcom 7425). | |
258 | ||
259 | If in doubt, say N. | |
260 | ||
7a998935 VK |
261 | config LOONGSON2_CPUFREQ |
262 | tristate "Loongson2 CPUFreq Driver" | |
0d307935 | 263 | depends on LEMOTE_MACH2F |
7a998935 VK |
264 | help |
265 | This option adds a CPUFreq driver for loongson processors which | |
266 | support software configurable cpu frequency. | |
267 | ||
268 | Loongson2F and it's successors support this feature. | |
269 | ||
270 | For details, take a look at <file:Documentation/cpu-freq/>. | |
271 | ||
272 | If in doubt, say N. | |
273 | ||
a0a22cf1 KC |
274 | config LOONGSON1_CPUFREQ |
275 | tristate "Loongson1 CPUFreq Driver" | |
0d307935 | 276 | depends on LOONGSON1_LS1B |
a0a22cf1 KC |
277 | help |
278 | This option adds a CPUFreq driver for loongson1 processors which | |
279 | support software configurable cpu frequency. | |
280 | ||
281 | For details, take a look at <file:Documentation/cpu-freq/>. | |
282 | ||
283 | If in doubt, say N. | |
f41f4815 | 284 | endif |
a0a22cf1 | 285 | |
f41f4815 | 286 | if SPARC64 |
764295ae VK |
287 | config SPARC_US3_CPUFREQ |
288 | tristate "UltraSPARC-III CPU Frequency driver" | |
764295ae VK |
289 | help |
290 | This adds the CPUFreq driver for UltraSPARC-III processors. | |
291 | ||
292 | For details, take a look at <file:Documentation/cpu-freq>. | |
293 | ||
294 | If in doubt, say N. | |
295 | ||
296 | config SPARC_US2E_CPUFREQ | |
297 | tristate "UltraSPARC-IIe CPU Frequency driver" | |
764295ae VK |
298 | help |
299 | This adds the CPUFreq driver for UltraSPARC-IIe processors. | |
300 | ||
301 | For details, take a look at <file:Documentation/cpu-freq>. | |
302 | ||
303 | If in doubt, say N. | |
f41f4815 | 304 | endif |
764295ae | 305 | |
f41f4815 | 306 | if SUPERH |
7258267e VK |
307 | config SH_CPU_FREQ |
308 | tristate "SuperH CPU Frequency driver" | |
7258267e VK |
309 | help |
310 | This adds the cpufreq driver for SuperH. Any CPU that supports | |
311 | clock rate rounding through the clock framework can use this | |
312 | driver. While it will make the kernel slightly larger, this is | |
313 | harmless for CPUs that don't support rate rounding. The driver | |
314 | will also generate a notice in the boot log before disabling | |
315 | itself if the CPU in question is not capable of rate rounding. | |
316 | ||
317 | For details, take a look at <file:Documentation/cpu-freq>. | |
318 | ||
319 | If unsure, say N. | |
f41f4815 | 320 | endif |
7258267e | 321 | |
2f249358 TY |
322 | config QORIQ_CPUFREQ |
323 | tristate "CPU frequency scaling driver for Freescale QorIQ SoCs" | |
5026ac23 | 324 | depends on OF && COMMON_CLK && (PPC_E500MC || ARM || ARM64) |
2f249358 TY |
325 | select CLK_QORIQ |
326 | help | |
327 | This adds the CPUFreq driver support for Freescale QorIQ SoCs | |
328 | which are capable of changing the CPU's frequency dynamically. | |
329 | ||
bb0a56ec DJ |
330 | endif |
331 | endmenu |