Commit | Line | Data |
---|---|---|
bb0a56ec DJ |
1 | menu "CPU Frequency scaling" |
2 | ||
1da177e4 LT |
3 | config CPU_FREQ |
4 | bool "CPU Frequency scaling" | |
5 | help | |
6 | CPU Frequency scaling allows you to change the clock speed of | |
7 | CPUs on the fly. This is a nice method to save power, because | |
8 | the lower the CPU clock speed, the less power the CPU consumes. | |
9 | ||
10 | Note that this driver doesn't automatically change the CPU | |
11 | clock speed, you need to either enable a dynamic cpufreq governor | |
12 | (see below) after boot, or use a userspace tool. | |
13 | ||
14 | For details, take a look at <file:Documentation/cpu-freq>. | |
15 | ||
16 | If in doubt, say N. | |
17 | ||
18 | if CPU_FREQ | |
19 | ||
1e15f295 LF |
20 | config CPU_FREQ_GOV_COMMON |
21 | bool | |
22 | ||
2fb4719b LM |
23 | config CPU_FREQ_BOOST_SW |
24 | bool | |
25 | depends on THERMAL | |
26 | ||
1da177e4 | 27 | config CPU_FREQ_STAT |
9101be53 | 28 | tristate "CPU frequency translation statistics" |
9101be53 MF |
29 | default y |
30 | help | |
31 | This driver exports CPU frequency statistics information through sysfs | |
32 | file system. | |
33 | ||
34 | To compile this driver as a module, choose M here: the | |
35 | module will be called cpufreq_stats. | |
36 | ||
37 | If in doubt, say N. | |
1da177e4 LT |
38 | |
39 | config CPU_FREQ_STAT_DETAILS | |
9101be53 MF |
40 | bool "CPU frequency translation statistics details" |
41 | depends on CPU_FREQ_STAT | |
42 | help | |
43 | This will show detail CPU frequency translation table in sysfs file | |
44 | system. | |
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" | |
6a108a14 | 66 | depends on EXPERT |
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. | |
1da177e4 LT |
105 | endchoice |
106 | ||
107 | config CPU_FREQ_GOV_PERFORMANCE | |
9101be53 MF |
108 | tristate "'performance' governor" |
109 | help | |
1da177e4 LT |
110 | This cpufreq governor sets the frequency statically to the |
111 | highest available CPU frequency. | |
112 | ||
9101be53 MF |
113 | To compile this driver as a module, choose M here: the |
114 | module will be called cpufreq_performance. | |
115 | ||
1da177e4 LT |
116 | If in doubt, say Y. |
117 | ||
118 | config CPU_FREQ_GOV_POWERSAVE | |
9101be53 MF |
119 | tristate "'powersave' governor" |
120 | help | |
1da177e4 LT |
121 | This cpufreq governor sets the frequency statically to the |
122 | lowest available CPU frequency. | |
123 | ||
9101be53 MF |
124 | To compile this driver as a module, choose M here: the |
125 | module will be called cpufreq_powersave. | |
126 | ||
1da177e4 LT |
127 | If in doubt, say Y. |
128 | ||
129 | config CPU_FREQ_GOV_USERSPACE | |
9101be53 MF |
130 | tristate "'userspace' governor for userspace frequency scaling" |
131 | help | |
1da177e4 | 132 | Enable this cpufreq governor when you either want to set the |
0211a9c8 | 133 | CPU frequency manually or when a userspace program shall |
1da177e4 | 134 | be able to set the CPU dynamically, like on LART |
4c41251e | 135 | <http://www.lartmaker.nl/>. |
1da177e4 | 136 | |
9101be53 MF |
137 | To compile this driver as a module, choose M here: the |
138 | module will be called cpufreq_userspace. | |
139 | ||
1da177e4 LT |
140 | For details, take a look at <file:Documentation/cpu-freq/>. |
141 | ||
142 | If in doubt, say Y. | |
143 | ||
144 | config CPU_FREQ_GOV_ONDEMAND | |
145 | tristate "'ondemand' cpufreq policy governor" | |
1e15f295 | 146 | select CPU_FREQ_GOV_COMMON |
1da177e4 LT |
147 | help |
148 | 'ondemand' - This driver adds a dynamic cpufreq policy governor. | |
149 | The governor does a periodic polling and | |
150 | changes frequency based on the CPU utilization. | |
151 | The support for this governor depends on CPU capability to | |
152 | do fast frequency switching (i.e, very low latency frequency | |
153 | transitions). | |
154 | ||
9101be53 MF |
155 | To compile this driver as a module, choose M here: the |
156 | module will be called cpufreq_ondemand. | |
157 | ||
1da177e4 LT |
158 | For details, take a look at linux/Documentation/cpu-freq. |
159 | ||
160 | If in doubt, say N. | |
161 | ||
b9170836 DJ |
162 | config CPU_FREQ_GOV_CONSERVATIVE |
163 | tristate "'conservative' cpufreq governor" | |
164 | depends on CPU_FREQ | |
1e15f295 | 165 | select CPU_FREQ_GOV_COMMON |
b9170836 DJ |
166 | help |
167 | 'conservative' - this driver is rather similar to the 'ondemand' | |
168 | governor both in its source code and its purpose, the difference is | |
169 | its optimisation for better suitability in a battery powered | |
170 | environment. The frequency is gracefully increased and decreased | |
171 | rather than jumping to 100% when speed is required. | |
172 | ||
173 | If you have a desktop machine then you should really be considering | |
174 | the 'ondemand' governor instead, however if you are using a laptop, | |
175 | PDA or even an AMD64 based computer (due to the unacceptable | |
176 | step-by-step latency issues between the minimum and maximum frequency | |
177 | transitions in the CPU) you will probably want to use this governor. | |
178 | ||
9101be53 MF |
179 | To compile this driver as a module, choose M here: the |
180 | module will be called cpufreq_conservative. | |
181 | ||
b9170836 DJ |
182 | For details, take a look at linux/Documentation/cpu-freq. |
183 | ||
184 | If in doubt, say N. | |
185 | ||
95ceafd4 | 186 | config GENERIC_CPUFREQ_CPU0 |
5553f9e2 | 187 | tristate "Generic CPU0 cpufreq driver" |
5fbfbcd3 | 188 | depends on HAVE_CLK && OF |
109df086 | 189 | select PM_OPP |
95ceafd4 SG |
190 | help |
191 | This adds a generic cpufreq driver for CPU0 frequency management. | |
192 | It supports both uniprocessor (UP) and symmetric multiprocessor (SMP) | |
193 | systems which share clock and voltage across all CPUs. | |
194 | ||
195 | If in doubt, say N. | |
196 | ||
bb0a56ec DJ |
197 | menu "x86 CPU frequency scaling drivers" |
198 | depends on X86 | |
199 | source "drivers/cpufreq/Kconfig.x86" | |
200 | endmenu | |
201 | ||
f7d77079 | 202 | menu "ARM CPU frequency scaling drivers" |
addea9ef | 203 | depends on ARM || ARM64 |
f7d77079 KK |
204 | source "drivers/cpufreq/Kconfig.arm" |
205 | endmenu | |
206 | ||
81c720c9 VK |
207 | menu "AVR32 CPU frequency scaling drivers" |
208 | depends on AVR32 | |
209 | ||
210 | config AVR32_AT32AP_CPUFREQ | |
211 | bool "CPU frequency driver for AT32AP" | |
212 | depends on PLATFORM_AT32AP | |
213 | default n | |
214 | help | |
215 | This enables the CPU frequency driver for AT32AP processors. | |
216 | If in doubt, say N. | |
217 | ||
218 | endmenu | |
219 | ||
ab423e43 VK |
220 | menu "CPUFreq processor drivers" |
221 | depends on IA64 | |
222 | ||
223 | config IA64_ACPI_CPUFREQ | |
224 | tristate "ACPI Processor P-States driver" | |
ab423e43 VK |
225 | depends on ACPI_PROCESSOR |
226 | help | |
227 | This driver adds a CPUFreq driver which utilizes the ACPI | |
228 | Processor Performance States. | |
229 | ||
230 | For details, take a look at <file:Documentation/cpu-freq/>. | |
231 | ||
232 | If in doubt, say N. | |
233 | ||
234 | endmenu | |
235 | ||
7a998935 VK |
236 | menu "MIPS CPUFreq processor drivers" |
237 | depends on MIPS | |
238 | ||
239 | config LOONGSON2_CPUFREQ | |
240 | tristate "Loongson2 CPUFreq Driver" | |
7a998935 VK |
241 | help |
242 | This option adds a CPUFreq driver for loongson processors which | |
243 | support software configurable cpu frequency. | |
244 | ||
245 | Loongson2F and it's successors support this feature. | |
246 | ||
247 | For details, take a look at <file:Documentation/cpu-freq/>. | |
248 | ||
249 | If in doubt, say N. | |
250 | ||
251 | endmenu | |
252 | ||
5d8c6658 DES |
253 | menu "PowerPC CPU frequency scaling drivers" |
254 | depends on PPC32 || PPC64 | |
255 | source "drivers/cpufreq/Kconfig.powerpc" | |
256 | endmenu | |
257 | ||
764295ae VK |
258 | menu "SPARC CPU frequency scaling drivers" |
259 | depends on SPARC64 | |
260 | config SPARC_US3_CPUFREQ | |
261 | tristate "UltraSPARC-III CPU Frequency driver" | |
764295ae VK |
262 | help |
263 | This adds the CPUFreq driver for UltraSPARC-III processors. | |
264 | ||
265 | For details, take a look at <file:Documentation/cpu-freq>. | |
266 | ||
267 | If in doubt, say N. | |
268 | ||
269 | config SPARC_US2E_CPUFREQ | |
270 | tristate "UltraSPARC-IIe CPU Frequency driver" | |
764295ae VK |
271 | help |
272 | This adds the CPUFreq driver for UltraSPARC-IIe processors. | |
273 | ||
274 | For details, take a look at <file:Documentation/cpu-freq>. | |
275 | ||
276 | If in doubt, say N. | |
277 | endmenu | |
278 | ||
7258267e VK |
279 | menu "SH CPU Frequency scaling" |
280 | depends on SUPERH | |
281 | config SH_CPU_FREQ | |
282 | tristate "SuperH CPU Frequency driver" | |
7258267e VK |
283 | help |
284 | This adds the cpufreq driver for SuperH. Any CPU that supports | |
285 | clock rate rounding through the clock framework can use this | |
286 | driver. While it will make the kernel slightly larger, this is | |
287 | harmless for CPUs that don't support rate rounding. The driver | |
288 | will also generate a notice in the boot log before disabling | |
289 | itself if the CPU in question is not capable of rate rounding. | |
290 | ||
291 | For details, take a look at <file:Documentation/cpu-freq>. | |
292 | ||
293 | If unsure, say N. | |
294 | endmenu | |
295 | ||
bb0a56ec DJ |
296 | endif |
297 | endmenu |