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 | ||
733dda9c AM |
16 | For details, take a look at |
17 | <file:Documentation/admin-guide/pm/cpufreq.rst>. | |
1da177e4 LT |
18 | |
19 | If in doubt, say N. | |
20 | ||
21 | if CPU_FREQ | |
22 | ||
2d0c58ad RW |
23 | config CPU_FREQ_GOV_ATTR_SET |
24 | bool | |
25 | ||
1e15f295 | 26 | config CPU_FREQ_GOV_COMMON |
2d0c58ad | 27 | select CPU_FREQ_GOV_ATTR_SET |
e6f03657 | 28 | select IRQ_WORK |
1e15f295 LF |
29 | bool |
30 | ||
1da177e4 | 31 | config CPU_FREQ_STAT |
1aefc75b | 32 | bool "CPU frequency transition statistics" |
9101be53 | 33 | help |
1aefc75b | 34 | Export CPU frequency statistics information through sysfs. |
9101be53 MF |
35 | |
36 | If in doubt, say N. | |
1da177e4 | 37 | |
1da177e4 LT |
38 | choice |
39 | prompt "Default CPUFreq governor" | |
559f56c7 | 40 | default CPU_FREQ_DEFAULT_GOV_USERSPACE if ARM_SA1100_CPUFREQ || ARM_SA1110_CPUFREQ |
f259eab3 | 41 | default CPU_FREQ_DEFAULT_GOV_SCHEDUTIL if ARM64 || ARM |
a00ec387 | 42 | default CPU_FREQ_DEFAULT_GOV_SCHEDUTIL if X86_INTEL_PSTATE && SMP |
1da177e4 LT |
43 | default CPU_FREQ_DEFAULT_GOV_PERFORMANCE |
44 | help | |
45 | This option sets which CPUFreq governor shall be loaded at | |
a00ec387 | 46 | startup. If in doubt, use the default setting. |
1da177e4 LT |
47 | |
48 | config CPU_FREQ_DEFAULT_GOV_PERFORMANCE | |
49 | bool "performance" | |
50 | select CPU_FREQ_GOV_PERFORMANCE | |
51 | help | |
52 | Use the CPUFreq governor 'performance' as default. This sets | |
53 | the frequency statically to the highest frequency supported by | |
54 | the CPU. | |
55 | ||
30d221db AG |
56 | config CPU_FREQ_DEFAULT_GOV_POWERSAVE |
57 | bool "powersave" | |
30d221db AG |
58 | select CPU_FREQ_GOV_POWERSAVE |
59 | help | |
60 | Use the CPUFreq governor 'powersave' as default. This sets | |
61 | the frequency statically to the lowest frequency supported by | |
62 | the CPU. | |
63 | ||
1da177e4 LT |
64 | config CPU_FREQ_DEFAULT_GOV_USERSPACE |
65 | bool "userspace" | |
66 | select CPU_FREQ_GOV_USERSPACE | |
67 | help | |
68 | Use the CPUFreq governor 'userspace' as default. This allows | |
0211a9c8 | 69 | you to set the CPU frequency manually or when a userspace |
1da177e4 LT |
70 | program shall be able to set the CPU dynamically without having |
71 | to enable the userspace governor manually. | |
72 | ||
1c256245 TR |
73 | config CPU_FREQ_DEFAULT_GOV_ONDEMAND |
74 | bool "ondemand" | |
db865272 | 75 | depends on !(X86_INTEL_PSTATE && SMP) |
1c256245 TR |
76 | select CPU_FREQ_GOV_ONDEMAND |
77 | select CPU_FREQ_GOV_PERFORMANCE | |
78 | help | |
79 | Use the CPUFreq governor 'ondemand' as default. This allows | |
80 | you to get a full dynamic frequency capable system by simply | |
81 | loading your cpufreq low-level hardware driver. | |
82 | Be aware that not all cpufreq drivers support the ondemand | |
83 | governor. If unsure have a look at the help section of the | |
84 | driver. Fallback governor will be the performance governor. | |
85 | ||
86 | config CPU_FREQ_DEFAULT_GOV_CONSERVATIVE | |
87 | bool "conservative" | |
db865272 | 88 | depends on !(X86_INTEL_PSTATE && SMP) |
1c256245 TR |
89 | select CPU_FREQ_GOV_CONSERVATIVE |
90 | select CPU_FREQ_GOV_PERFORMANCE | |
91 | help | |
92 | Use the CPUFreq governor 'conservative' as default. This allows | |
93 | you to get a full dynamic frequency capable system by simply | |
94 | loading your cpufreq low-level hardware driver. | |
95 | Be aware that not all cpufreq drivers support the conservative | |
96 | governor. If unsure have a look at the help section of the | |
97 | driver. Fallback governor will be the performance governor. | |
9bdcb44e RW |
98 | |
99 | config CPU_FREQ_DEFAULT_GOV_SCHEDUTIL | |
100 | bool "schedutil" | |
cfe9492f | 101 | depends on SMP |
9bdcb44e RW |
102 | select CPU_FREQ_GOV_SCHEDUTIL |
103 | select CPU_FREQ_GOV_PERFORMANCE | |
104 | help | |
105 | Use the 'schedutil' CPUFreq governor by default. If unsure, | |
106 | have a look at the help section of that governor. The fallback | |
107 | governor will be 'performance'. | |
108 | ||
1da177e4 LT |
109 | endchoice |
110 | ||
111 | config CPU_FREQ_GOV_PERFORMANCE | |
9101be53 MF |
112 | tristate "'performance' governor" |
113 | help | |
1da177e4 LT |
114 | This cpufreq governor sets the frequency statically to the |
115 | highest available CPU frequency. | |
116 | ||
9101be53 MF |
117 | To compile this driver as a module, choose M here: the |
118 | module will be called cpufreq_performance. | |
119 | ||
1da177e4 LT |
120 | If in doubt, say Y. |
121 | ||
122 | config CPU_FREQ_GOV_POWERSAVE | |
9101be53 MF |
123 | tristate "'powersave' governor" |
124 | help | |
1da177e4 LT |
125 | This cpufreq governor sets the frequency statically to the |
126 | lowest available CPU frequency. | |
127 | ||
9101be53 MF |
128 | To compile this driver as a module, choose M here: the |
129 | module will be called cpufreq_powersave. | |
130 | ||
1da177e4 LT |
131 | If in doubt, say Y. |
132 | ||
133 | config CPU_FREQ_GOV_USERSPACE | |
9101be53 MF |
134 | tristate "'userspace' governor for userspace frequency scaling" |
135 | help | |
1da177e4 | 136 | Enable this cpufreq governor when you either want to set the |
0211a9c8 | 137 | CPU frequency manually or when a userspace program shall |
1da177e4 | 138 | be able to set the CPU dynamically, like on LART |
4c41251e | 139 | <http://www.lartmaker.nl/>. |
1da177e4 | 140 | |
9101be53 MF |
141 | To compile this driver as a module, choose M here: the |
142 | module will be called cpufreq_userspace. | |
143 | ||
1da177e4 LT |
144 | If in doubt, say Y. |
145 | ||
146 | config CPU_FREQ_GOV_ONDEMAND | |
147 | tristate "'ondemand' cpufreq policy governor" | |
1e15f295 | 148 | select CPU_FREQ_GOV_COMMON |
1da177e4 LT |
149 | help |
150 | 'ondemand' - This driver adds a dynamic cpufreq policy governor. | |
151 | The governor does a periodic polling and | |
152 | changes frequency based on the CPU utilization. | |
153 | The support for this governor depends on CPU capability to | |
154 | do fast frequency switching (i.e, very low latency frequency | |
155 | transitions). | |
156 | ||
9101be53 MF |
157 | To compile this driver as a module, choose M here: the |
158 | module will be called cpufreq_ondemand. | |
159 | ||
733dda9c AM |
160 | For details, take a look at |
161 | <file:Documentation/admin-guide/pm/cpufreq.rst>. | |
1da177e4 LT |
162 | |
163 | If in doubt, say N. | |
164 | ||
b9170836 DJ |
165 | config CPU_FREQ_GOV_CONSERVATIVE |
166 | tristate "'conservative' cpufreq governor" | |
167 | depends on CPU_FREQ | |
1e15f295 | 168 | select CPU_FREQ_GOV_COMMON |
b9170836 DJ |
169 | help |
170 | 'conservative' - this driver is rather similar to the 'ondemand' | |
171 | governor both in its source code and its purpose, the difference is | |
172 | its optimisation for better suitability in a battery powered | |
173 | environment. The frequency is gracefully increased and decreased | |
174 | rather than jumping to 100% when speed is required. | |
175 | ||
176 | If you have a desktop machine then you should really be considering | |
177 | the 'ondemand' governor instead, however if you are using a laptop, | |
178 | PDA or even an AMD64 based computer (due to the unacceptable | |
179 | step-by-step latency issues between the minimum and maximum frequency | |
180 | transitions in the CPU) you will probably want to use this governor. | |
181 | ||
9101be53 MF |
182 | To compile this driver as a module, choose M here: the |
183 | module will be called cpufreq_conservative. | |
184 | ||
733dda9c AM |
185 | For details, take a look at |
186 | <file:Documentation/admin-guide/pm/cpufreq.rst>. | |
b9170836 DJ |
187 | |
188 | If in doubt, say N. | |
189 | ||
9bdcb44e | 190 | config CPU_FREQ_GOV_SCHEDUTIL |
58919e83 | 191 | bool "'schedutil' cpufreq policy governor" |
bf7cdff1 | 192 | depends on CPU_FREQ && SMP |
9bdcb44e RW |
193 | select CPU_FREQ_GOV_ATTR_SET |
194 | select IRQ_WORK | |
195 | help | |
196 | This governor makes decisions based on the utilization data provided | |
197 | by the scheduler. It sets the CPU frequency to be proportional to | |
198 | the utilization/capacity ratio coming from the scheduler. If the | |
199 | utilization is frequency-invariant, the new frequency is also | |
200 | proportional to the maximum available frequency. If that is not the | |
201 | case, it is proportional to the current frequency of the CPU. The | |
202 | frequency tipping point is at utilization/capacity equal to 80% in | |
203 | both cases. | |
204 | ||
9bdcb44e RW |
205 | If in doubt, say N. |
206 | ||
f41f4815 VK |
207 | comment "CPU frequency scaling drivers" |
208 | ||
bbcf0719 VK |
209 | config CPUFREQ_DT |
210 | tristate "Generic DT based cpufreq driver" | |
5fbfbcd3 | 211 | depends on HAVE_CLK && OF |
f56aad1d | 212 | select CPUFREQ_DT_PLATDEV |
109df086 | 213 | select PM_OPP |
95ceafd4 | 214 | help |
bbcf0719 | 215 | This adds a generic DT based cpufreq driver for frequency management. |
95ceafd4 | 216 | It supports both uniprocessor (UP) and symmetric multiprocessor (SMP) |
33cc4fc1 | 217 | systems. |
95ceafd4 SG |
218 | |
219 | If in doubt, say N. | |
220 | ||
f56aad1d VK |
221 | config CPUFREQ_DT_PLATDEV |
222 | bool | |
223 | help | |
224 | This adds a generic DT based cpufreq platdev driver for frequency | |
225 | management. This creates a 'cpufreq-dt' platform device, on the | |
226 | supported platforms. | |
227 | ||
228 | If in doubt, say N. | |
229 | ||
f41f4815 | 230 | if X86 |
bb0a56ec | 231 | source "drivers/cpufreq/Kconfig.x86" |
f41f4815 | 232 | endif |
bb0a56ec | 233 | |
f41f4815 | 234 | if ARM || ARM64 |
f7d77079 | 235 | source "drivers/cpufreq/Kconfig.arm" |
f41f4815 | 236 | endif |
f7d77079 | 237 | |
f41f4815 VK |
238 | if PPC32 || PPC64 |
239 | source "drivers/cpufreq/Kconfig.powerpc" | |
240 | endif | |
81c720c9 | 241 | |
f41f4815 | 242 | if IA64 |
ab423e43 VK |
243 | config IA64_ACPI_CPUFREQ |
244 | tristate "ACPI Processor P-States driver" | |
ab423e43 VK |
245 | depends on ACPI_PROCESSOR |
246 | help | |
247 | This driver adds a CPUFreq driver which utilizes the ACPI | |
248 | Processor Performance States. | |
249 | ||
ab423e43 | 250 | If in doubt, say N. |
f41f4815 | 251 | endif |
ab423e43 | 252 | |
f41f4815 | 253 | if MIPS |
cdb56cbf MM |
254 | config BMIPS_CPUFREQ |
255 | tristate "BMIPS CPUfreq Driver" | |
256 | help | |
257 | This option adds a CPUfreq driver for BMIPS processors with | |
258 | support for configurable CPU frequency. | |
259 | ||
260 | For now, BMIPS5 chips are supported (such as the Broadcom 7425). | |
261 | ||
262 | If in doubt, say N. | |
263 | ||
7a998935 VK |
264 | config LOONGSON2_CPUFREQ |
265 | tristate "Loongson2 CPUFreq Driver" | |
0d307935 | 266 | depends on LEMOTE_MACH2F |
7a998935 VK |
267 | help |
268 | This option adds a CPUFreq driver for loongson processors which | |
269 | support software configurable cpu frequency. | |
270 | ||
271 | Loongson2F and it's successors support this feature. | |
272 | ||
7a998935 VK |
273 | If in doubt, say N. |
274 | ||
a0a22cf1 KC |
275 | config LOONGSON1_CPUFREQ |
276 | tristate "Loongson1 CPUFreq Driver" | |
0d307935 | 277 | depends on LOONGSON1_LS1B |
a0a22cf1 KC |
278 | help |
279 | This option adds a CPUFreq driver for loongson1 processors which | |
280 | support software configurable cpu frequency. | |
281 | ||
a0a22cf1 | 282 | If in doubt, say N. |
f41f4815 | 283 | endif |
a0a22cf1 | 284 | |
f41f4815 | 285 | if SPARC64 |
764295ae VK |
286 | config SPARC_US3_CPUFREQ |
287 | tristate "UltraSPARC-III CPU Frequency driver" | |
764295ae VK |
288 | help |
289 | This adds the CPUFreq driver for UltraSPARC-III processors. | |
290 | ||
764295ae VK |
291 | If in doubt, say N. |
292 | ||
293 | config SPARC_US2E_CPUFREQ | |
294 | tristate "UltraSPARC-IIe CPU Frequency driver" | |
764295ae VK |
295 | help |
296 | This adds the CPUFreq driver for UltraSPARC-IIe processors. | |
297 | ||
764295ae | 298 | If in doubt, say N. |
f41f4815 | 299 | endif |
764295ae | 300 | |
f41f4815 | 301 | if SUPERH |
7258267e VK |
302 | config SH_CPU_FREQ |
303 | tristate "SuperH CPU Frequency driver" | |
7258267e VK |
304 | help |
305 | This adds the cpufreq driver for SuperH. Any CPU that supports | |
306 | clock rate rounding through the clock framework can use this | |
307 | driver. While it will make the kernel slightly larger, this is | |
308 | harmless for CPUs that don't support rate rounding. The driver | |
309 | will also generate a notice in the boot log before disabling | |
310 | itself if the CPU in question is not capable of rate rounding. | |
311 | ||
7258267e | 312 | If unsure, say N. |
f41f4815 | 313 | endif |
7258267e | 314 | |
2f249358 TY |
315 | config QORIQ_CPUFREQ |
316 | tristate "CPU frequency scaling driver for Freescale QorIQ SoCs" | |
1f1755af GU |
317 | depends on OF && COMMON_CLK |
318 | depends on PPC_E500MC || SOC_LS1021A || ARCH_LAYERSCAPE || COMPILE_TEST | |
2f249358 TY |
319 | select CLK_QORIQ |
320 | help | |
321 | This adds the CPUFreq driver support for Freescale QorIQ SoCs | |
322 | which are capable of changing the CPU's frequency dynamically. | |
323 | ||
bb0a56ec DJ |
324 | endif |
325 | endmenu |