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 |
9101be53 | 34 | tristate "CPU frequency translation statistics" |
9101be53 MF |
35 | default y |
36 | help | |
37 | This driver exports CPU frequency statistics information through sysfs | |
38 | file system. | |
39 | ||
40 | To compile this driver as a module, choose M here: the | |
41 | module will be called cpufreq_stats. | |
42 | ||
43 | If in doubt, say N. | |
1da177e4 LT |
44 | |
45 | config CPU_FREQ_STAT_DETAILS | |
9101be53 MF |
46 | bool "CPU frequency translation statistics details" |
47 | depends on CPU_FREQ_STAT | |
48 | help | |
49 | This will show detail CPU frequency translation table in sysfs file | |
50 | system. | |
51 | ||
52 | If in doubt, say N. | |
1da177e4 LT |
53 | |
54 | choice | |
55 | prompt "Default CPUFreq governor" | |
559f56c7 | 56 | default CPU_FREQ_DEFAULT_GOV_USERSPACE if ARM_SA1100_CPUFREQ || ARM_SA1110_CPUFREQ |
1da177e4 LT |
57 | default CPU_FREQ_DEFAULT_GOV_PERFORMANCE |
58 | help | |
59 | This option sets which CPUFreq governor shall be loaded at | |
60 | startup. If in doubt, select 'performance'. | |
61 | ||
62 | config CPU_FREQ_DEFAULT_GOV_PERFORMANCE | |
63 | bool "performance" | |
64 | select CPU_FREQ_GOV_PERFORMANCE | |
65 | help | |
66 | Use the CPUFreq governor 'performance' as default. This sets | |
67 | the frequency statically to the highest frequency supported by | |
68 | the CPU. | |
69 | ||
30d221db AG |
70 | config CPU_FREQ_DEFAULT_GOV_POWERSAVE |
71 | bool "powersave" | |
30d221db AG |
72 | select CPU_FREQ_GOV_POWERSAVE |
73 | help | |
74 | Use the CPUFreq governor 'powersave' as default. This sets | |
75 | the frequency statically to the lowest frequency supported by | |
76 | the CPU. | |
77 | ||
1da177e4 LT |
78 | config CPU_FREQ_DEFAULT_GOV_USERSPACE |
79 | bool "userspace" | |
80 | select CPU_FREQ_GOV_USERSPACE | |
81 | help | |
82 | Use the CPUFreq governor 'userspace' as default. This allows | |
0211a9c8 | 83 | you to set the CPU frequency manually or when a userspace |
1da177e4 LT |
84 | program shall be able to set the CPU dynamically without having |
85 | to enable the userspace governor manually. | |
86 | ||
1c256245 TR |
87 | config CPU_FREQ_DEFAULT_GOV_ONDEMAND |
88 | bool "ondemand" | |
89 | select CPU_FREQ_GOV_ONDEMAND | |
90 | select CPU_FREQ_GOV_PERFORMANCE | |
91 | help | |
92 | Use the CPUFreq governor 'ondemand' 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 ondemand | |
96 | governor. If unsure have a look at the help section of the | |
97 | driver. Fallback governor will be the performance governor. | |
98 | ||
99 | config CPU_FREQ_DEFAULT_GOV_CONSERVATIVE | |
100 | bool "conservative" | |
101 | select CPU_FREQ_GOV_CONSERVATIVE | |
102 | select CPU_FREQ_GOV_PERFORMANCE | |
103 | help | |
104 | Use the CPUFreq governor 'conservative' as default. This allows | |
105 | you to get a full dynamic frequency capable system by simply | |
106 | loading your cpufreq low-level hardware driver. | |
107 | Be aware that not all cpufreq drivers support the conservative | |
108 | governor. If unsure have a look at the help section of the | |
109 | driver. Fallback governor will be the performance governor. | |
1da177e4 LT |
110 | endchoice |
111 | ||
112 | config CPU_FREQ_GOV_PERFORMANCE | |
9101be53 MF |
113 | tristate "'performance' governor" |
114 | help | |
1da177e4 LT |
115 | This cpufreq governor sets the frequency statically to the |
116 | highest available CPU frequency. | |
117 | ||
9101be53 MF |
118 | To compile this driver as a module, choose M here: the |
119 | module will be called cpufreq_performance. | |
120 | ||
1da177e4 LT |
121 | If in doubt, say Y. |
122 | ||
123 | config CPU_FREQ_GOV_POWERSAVE | |
9101be53 MF |
124 | tristate "'powersave' governor" |
125 | help | |
1da177e4 LT |
126 | This cpufreq governor sets the frequency statically to the |
127 | lowest available CPU frequency. | |
128 | ||
9101be53 MF |
129 | To compile this driver as a module, choose M here: the |
130 | module will be called cpufreq_powersave. | |
131 | ||
1da177e4 LT |
132 | If in doubt, say Y. |
133 | ||
134 | config CPU_FREQ_GOV_USERSPACE | |
9101be53 MF |
135 | tristate "'userspace' governor for userspace frequency scaling" |
136 | help | |
1da177e4 | 137 | Enable this cpufreq governor when you either want to set the |
0211a9c8 | 138 | CPU frequency manually or when a userspace program shall |
1da177e4 | 139 | be able to set the CPU dynamically, like on LART |
4c41251e | 140 | <http://www.lartmaker.nl/>. |
1da177e4 | 141 | |
9101be53 MF |
142 | To compile this driver as a module, choose M here: the |
143 | module will be called cpufreq_userspace. | |
144 | ||
1da177e4 LT |
145 | For details, take a look at <file:Documentation/cpu-freq/>. |
146 | ||
147 | If in doubt, say Y. | |
148 | ||
149 | config CPU_FREQ_GOV_ONDEMAND | |
150 | tristate "'ondemand' cpufreq policy governor" | |
1e15f295 | 151 | select CPU_FREQ_GOV_COMMON |
1da177e4 LT |
152 | help |
153 | 'ondemand' - This driver adds a dynamic cpufreq policy governor. | |
154 | The governor does a periodic polling and | |
155 | changes frequency based on the CPU utilization. | |
156 | The support for this governor depends on CPU capability to | |
157 | do fast frequency switching (i.e, very low latency frequency | |
158 | transitions). | |
159 | ||
9101be53 MF |
160 | To compile this driver as a module, choose M here: the |
161 | module will be called cpufreq_ondemand. | |
162 | ||
1da177e4 LT |
163 | For details, take a look at linux/Documentation/cpu-freq. |
164 | ||
165 | If in doubt, say N. | |
166 | ||
b9170836 DJ |
167 | config CPU_FREQ_GOV_CONSERVATIVE |
168 | tristate "'conservative' cpufreq governor" | |
169 | depends on CPU_FREQ | |
1e15f295 | 170 | select CPU_FREQ_GOV_COMMON |
b9170836 DJ |
171 | help |
172 | 'conservative' - this driver is rather similar to the 'ondemand' | |
173 | governor both in its source code and its purpose, the difference is | |
174 | its optimisation for better suitability in a battery powered | |
175 | environment. The frequency is gracefully increased and decreased | |
176 | rather than jumping to 100% when speed is required. | |
177 | ||
178 | If you have a desktop machine then you should really be considering | |
179 | the 'ondemand' governor instead, however if you are using a laptop, | |
180 | PDA or even an AMD64 based computer (due to the unacceptable | |
181 | step-by-step latency issues between the minimum and maximum frequency | |
182 | transitions in the CPU) you will probably want to use this governor. | |
183 | ||
9101be53 MF |
184 | To compile this driver as a module, choose M here: the |
185 | module will be called cpufreq_conservative. | |
186 | ||
b9170836 DJ |
187 | For details, take a look at linux/Documentation/cpu-freq. |
188 | ||
189 | If in doubt, say N. | |
190 | ||
f41f4815 VK |
191 | comment "CPU frequency scaling drivers" |
192 | ||
bbcf0719 VK |
193 | config CPUFREQ_DT |
194 | tristate "Generic DT based cpufreq driver" | |
5fbfbcd3 | 195 | depends on HAVE_CLK && OF |
bbcf0719 | 196 | # if CPU_THERMAL is on and THERMAL=m, CPUFREQ_DT cannot be =y: |
217886d3 | 197 | depends on !CPU_THERMAL || THERMAL |
109df086 | 198 | select PM_OPP |
95ceafd4 | 199 | help |
bbcf0719 | 200 | This adds a generic DT based cpufreq driver for frequency management. |
95ceafd4 SG |
201 | It supports both uniprocessor (UP) and symmetric multiprocessor (SMP) |
202 | systems which share clock and voltage across all CPUs. | |
203 | ||
204 | If in doubt, say N. | |
205 | ||
f41f4815 | 206 | if X86 |
bb0a56ec | 207 | source "drivers/cpufreq/Kconfig.x86" |
f41f4815 | 208 | endif |
bb0a56ec | 209 | |
f41f4815 | 210 | if ARM || ARM64 |
f7d77079 | 211 | source "drivers/cpufreq/Kconfig.arm" |
f41f4815 | 212 | endif |
f7d77079 | 213 | |
f41f4815 VK |
214 | if PPC32 || PPC64 |
215 | source "drivers/cpufreq/Kconfig.powerpc" | |
216 | endif | |
81c720c9 | 217 | |
f41f4815 | 218 | if AVR32 |
81c720c9 VK |
219 | config AVR32_AT32AP_CPUFREQ |
220 | bool "CPU frequency driver for AT32AP" | |
221 | depends on PLATFORM_AT32AP | |
222 | default n | |
223 | help | |
224 | This enables the CPU frequency driver for AT32AP processors. | |
225 | If in doubt, say N. | |
f41f4815 | 226 | endif |
81c720c9 | 227 | |
f41f4815 | 228 | if IA64 |
ab423e43 VK |
229 | config IA64_ACPI_CPUFREQ |
230 | tristate "ACPI Processor P-States driver" | |
ab423e43 VK |
231 | depends on ACPI_PROCESSOR |
232 | help | |
233 | This driver adds a CPUFreq driver which utilizes the ACPI | |
234 | Processor Performance States. | |
235 | ||
236 | For details, take a look at <file:Documentation/cpu-freq/>. | |
237 | ||
238 | If in doubt, say N. | |
f41f4815 | 239 | endif |
ab423e43 | 240 | |
f41f4815 | 241 | if MIPS |
7a998935 VK |
242 | config LOONGSON2_CPUFREQ |
243 | tristate "Loongson2 CPUFreq Driver" | |
7a998935 VK |
244 | help |
245 | This option adds a CPUFreq driver for loongson processors which | |
246 | support software configurable cpu frequency. | |
247 | ||
248 | Loongson2F and it's successors support this feature. | |
249 | ||
250 | For details, take a look at <file:Documentation/cpu-freq/>. | |
251 | ||
252 | If in doubt, say N. | |
253 | ||
a0a22cf1 KC |
254 | config LOONGSON1_CPUFREQ |
255 | tristate "Loongson1 CPUFreq Driver" | |
256 | help | |
257 | This option adds a CPUFreq driver for loongson1 processors which | |
258 | support software configurable cpu frequency. | |
259 | ||
260 | For details, take a look at <file:Documentation/cpu-freq/>. | |
261 | ||
262 | If in doubt, say N. | |
f41f4815 | 263 | endif |
a0a22cf1 | 264 | |
f41f4815 | 265 | if SPARC64 |
764295ae VK |
266 | config SPARC_US3_CPUFREQ |
267 | tristate "UltraSPARC-III CPU Frequency driver" | |
764295ae VK |
268 | help |
269 | This adds the CPUFreq driver for UltraSPARC-III processors. | |
270 | ||
271 | For details, take a look at <file:Documentation/cpu-freq>. | |
272 | ||
273 | If in doubt, say N. | |
274 | ||
275 | config SPARC_US2E_CPUFREQ | |
276 | tristate "UltraSPARC-IIe CPU Frequency driver" | |
764295ae VK |
277 | help |
278 | This adds the CPUFreq driver for UltraSPARC-IIe processors. | |
279 | ||
280 | For details, take a look at <file:Documentation/cpu-freq>. | |
281 | ||
282 | If in doubt, say N. | |
f41f4815 | 283 | endif |
764295ae | 284 | |
f41f4815 | 285 | if SUPERH |
7258267e VK |
286 | config SH_CPU_FREQ |
287 | tristate "SuperH CPU Frequency driver" | |
7258267e VK |
288 | help |
289 | This adds the cpufreq driver for SuperH. Any CPU that supports | |
290 | clock rate rounding through the clock framework can use this | |
291 | driver. While it will make the kernel slightly larger, this is | |
292 | harmless for CPUs that don't support rate rounding. The driver | |
293 | will also generate a notice in the boot log before disabling | |
294 | itself if the CPU in question is not capable of rate rounding. | |
295 | ||
296 | For details, take a look at <file:Documentation/cpu-freq>. | |
297 | ||
298 | If unsure, say N. | |
f41f4815 | 299 | endif |
7258267e | 300 | |
2f249358 TY |
301 | config QORIQ_CPUFREQ |
302 | tristate "CPU frequency scaling driver for Freescale QorIQ SoCs" | |
303 | depends on OF && COMMON_CLK && (PPC_E500MC || ARM) | |
ddd30ef4 | 304 | depends on !CPU_THERMAL || THERMAL |
2f249358 TY |
305 | select CLK_QORIQ |
306 | help | |
307 | This adds the CPUFreq driver support for Freescale QorIQ SoCs | |
308 | which are capable of changing the CPU's frequency dynamically. | |
309 | ||
bb0a56ec DJ |
310 | endif |
311 | endmenu |