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Commit | Line | Data |
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1da177e4 | 1 | # |
bb0a56ec | 2 | # x86 CPU Frequency scaling drivers |
1da177e4 LT |
3 | # |
4 | ||
93f0822d | 5 | config X86_INTEL_PSTATE |
da0d9fda | 6 | bool "Intel P state control" |
93f0822d | 7 | depends on X86 |
9522a2ff | 8 | select ACPI_PROCESSOR if ACPI |
93f0822d DB |
9 | help |
10 | This driver provides a P state for Intel core processors. | |
11 | The driver implements an internal governor and will become | |
12 | the scaling driver and governor for Sandy bridge processors. | |
13 | ||
735dc249 | 14 | When this driver is enabled it will become the preferred |
93f0822d DB |
15 | scaling driver for Sandy bridge processors. |
16 | ||
93f0822d DB |
17 | If in doubt, say N. |
18 | ||
0f1d683f NC |
19 | config X86_PCC_CPUFREQ |
20 | tristate "Processor Clocking Control interface driver" | |
21 | depends on ACPI && ACPI_PROCESSOR | |
22 | help | |
23 | This driver adds support for the PCC interface. | |
24 | ||
25 | For details, take a look at: | |
26 | <file:Documentation/cpu-freq/pcc-cpufreq.txt>. | |
27 | ||
28 | To compile this driver as a module, choose M here: the | |
29 | module will be called pcc-cpufreq. | |
30 | ||
31 | If in doubt, say N. | |
32 | ||
1da177e4 LT |
33 | config X86_ACPI_CPUFREQ |
34 | tristate "ACPI Processor P-States driver" | |
1da177e4 LT |
35 | depends on ACPI_PROCESSOR |
36 | help | |
37 | This driver adds a CPUFreq driver which utilizes the ACPI | |
38 | Processor Performance States. | |
3dc9a633 MG |
39 | This driver also supports Intel Enhanced Speedstep and newer |
40 | AMD CPUs. | |
1da177e4 | 41 | |
e8ef9522 SR |
42 | To compile this driver as a module, choose M here: the |
43 | module will be called acpi-cpufreq. | |
44 | ||
1da177e4 LT |
45 | For details, take a look at <file:Documentation/cpu-freq/>. |
46 | ||
47 | If in doubt, say N. | |
48 | ||
11269ff5 AP |
49 | config X86_ACPI_CPUFREQ_CPB |
50 | default y | |
51 | bool "Legacy cpb sysfs knob support for AMD CPUs" | |
52 | depends on X86_ACPI_CPUFREQ && CPU_SUP_AMD | |
53 | help | |
54 | The powernow-k8 driver used to provide a sysfs knob called "cpb" | |
55 | to disable the Core Performance Boosting feature of AMD CPUs. This | |
735dc249 | 56 | file has now been superseded by the more generic "boost" entry. |
11269ff5 AP |
57 | |
58 | By enabling this option the acpi_cpufreq driver provides the old | |
59 | entry in addition to the new boost ones, for compatibility reasons. | |
60 | ||
e7ddf4b7 SK |
61 | config X86_SFI_CPUFREQ |
62 | tristate "SFI Performance-States driver" | |
63 | depends on X86_INTEL_MID && SFI | |
64 | help | |
65 | This adds a CPUFreq driver for some Silvermont based Intel Atom | |
66 | architectures like Z34xx and Z35xx which enumerate processor | |
67 | performance states through SFI. | |
68 | ||
69 | If in doubt, say N. | |
70 | ||
1da177e4 | 71 | config ELAN_CPUFREQ |
bf6fc9fd | 72 | tristate "AMD Elan SC400 and SC410" |
ce9c99af | 73 | depends on MELAN |
1da177e4 LT |
74 | ---help--- |
75 | This adds the CPUFreq driver for AMD Elan SC400 and SC410 | |
76 | processors. | |
77 | ||
78 | You need to specify the processor maximum speed as boot | |
79 | parameter: elanfreq=maxspeed (in kHz) or as module | |
80 | parameter "max_freq". | |
81 | ||
82 | For details, take a look at <file:Documentation/cpu-freq/>. | |
83 | ||
84 | If in doubt, say N. | |
85 | ||
bf6fc9fd DJ |
86 | config SC520_CPUFREQ |
87 | tristate "AMD Elan SC520" | |
ce9c99af | 88 | depends on MELAN |
bf6fc9fd DJ |
89 | ---help--- |
90 | This adds the CPUFreq driver for AMD Elan SC520 processor. | |
91 | ||
92 | For details, take a look at <file:Documentation/cpu-freq/>. | |
93 | ||
94 | If in doubt, say N. | |
95 | ||
96 | ||
1da177e4 LT |
97 | config X86_POWERNOW_K6 |
98 | tristate "AMD Mobile K6-2/K6-3 PowerNow!" | |
e8ef9522 | 99 | depends on X86_32 |
1da177e4 LT |
100 | help |
101 | This adds the CPUFreq driver for mobile AMD K6-2+ and mobile | |
102 | AMD K6-3+ processors. | |
103 | ||
104 | For details, take a look at <file:Documentation/cpu-freq/>. | |
105 | ||
106 | If in doubt, say N. | |
107 | ||
108 | config X86_POWERNOW_K7 | |
109 | tristate "AMD Mobile Athlon/Duron PowerNow!" | |
e8ef9522 | 110 | depends on X86_32 |
1da177e4 LT |
111 | help |
112 | This adds the CPUFreq driver for mobile AMD K7 mobile processors. | |
113 | ||
114 | For details, take a look at <file:Documentation/cpu-freq/>. | |
115 | ||
116 | If in doubt, say N. | |
117 | ||
118 | config X86_POWERNOW_K7_ACPI | |
119 | bool | |
120 | depends on X86_POWERNOW_K7 && ACPI_PROCESSOR | |
121 | depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m) | |
e8ef9522 | 122 | depends on X86_32 |
1da177e4 LT |
123 | default y |
124 | ||
125 | config X86_POWERNOW_K8 | |
126 | tristate "AMD Opteron/Athlon64 PowerNow!" | |
631e8ac1 | 127 | depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ |
1da177e4 | 128 | help |
034be8fd AP |
129 | This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors. |
130 | Support for K10 and newer processors is now in acpi-cpufreq. | |
1da177e4 | 131 | |
e8ef9522 SR |
132 | To compile this driver as a module, choose M here: the |
133 | module will be called powernow-k8. | |
134 | ||
1da177e4 LT |
135 | For details, take a look at <file:Documentation/cpu-freq/>. |
136 | ||
9c5320c8 JS |
137 | config X86_AMD_FREQ_SENSITIVITY |
138 | tristate "AMD frequency sensitivity feedback powersave bias" | |
139 | depends on CPU_FREQ_GOV_ONDEMAND && X86_ACPI_CPUFREQ && CPU_SUP_AMD | |
140 | help | |
141 | This adds AMD-specific powersave bias function to the ondemand | |
142 | governor, which allows it to make more power-conscious frequency | |
8c88126b | 143 | change decisions based on feedback from hardware (available on AMD |
9c5320c8 JS |
144 | Family 16h and above). |
145 | ||
146 | Hardware feedback tells software how "sensitive" to frequency changes | |
147 | the CPUs' workloads are. CPU-bound workloads will be more sensitive | |
148 | -- they will perform better as frequency increases. Memory/IO-bound | |
149 | workloads will be less sensitive -- they will not necessarily perform | |
150 | better as frequency increases. | |
151 | ||
152 | If in doubt, say N. | |
153 | ||
1da177e4 LT |
154 | config X86_GX_SUSPMOD |
155 | tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation" | |
e8ef9522 | 156 | depends on X86_32 && PCI |
1da177e4 LT |
157 | help |
158 | This add the CPUFreq driver for NatSemi Geode processors which | |
159 | support suspend modulation. | |
160 | ||
161 | For details, take a look at <file:Documentation/cpu-freq/>. | |
162 | ||
163 | If in doubt, say N. | |
164 | ||
165 | config X86_SPEEDSTEP_CENTRINO | |
e8ef9522 | 166 | tristate "Intel Enhanced SpeedStep (deprecated)" |
e8ef9522 SR |
167 | select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32 |
168 | depends on X86_32 || (X86_64 && ACPI_PROCESSOR) | |
1da177e4 | 169 | help |
e8ef9522 SR |
170 | This is deprecated and this functionality is now merged into |
171 | acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of | |
172 | speedstep_centrino. | |
1da177e4 | 173 | This adds the CPUFreq driver for Enhanced SpeedStep enabled |
e8ef9522 SR |
174 | mobile CPUs. This means Intel Pentium M (Centrino) CPUs |
175 | or 64bit enabled Intel Xeons. | |
176 | ||
177 | To compile this driver as a module, choose M here: the | |
178 | module will be called speedstep-centrino. | |
388d6c51 | 179 | |
1da177e4 | 180 | For details, take a look at <file:Documentation/cpu-freq/>. |
388d6c51 | 181 | |
1da177e4 LT |
182 | If in doubt, say N. |
183 | ||
1da177e4 LT |
184 | config X86_SPEEDSTEP_CENTRINO_TABLE |
185 | bool "Built-in tables for Banias CPUs" | |
e8ef9522 | 186 | depends on X86_32 && X86_SPEEDSTEP_CENTRINO |
1da177e4 LT |
187 | default y |
188 | help | |
189 | Use built-in tables for Banias CPUs if ACPI encoding | |
190 | is not available. | |
191 | ||
192 | If in doubt, say N. | |
193 | ||
194 | config X86_SPEEDSTEP_ICH | |
195 | tristate "Intel Speedstep on ICH-M chipsets (ioport interface)" | |
e8ef9522 | 196 | depends on X86_32 |
1da177e4 LT |
197 | help |
198 | This adds the CPUFreq driver for certain mobile Intel Pentium III | |
199 | (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all | |
388d6c51 | 200 | mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2, |
1da177e4 LT |
201 | ICH3 or ICH4 southbridge. |
202 | ||
203 | For details, take a look at <file:Documentation/cpu-freq/>. | |
204 | ||
205 | If in doubt, say N. | |
206 | ||
207 | config X86_SPEEDSTEP_SMI | |
208 | tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)" | |
0f194b56 | 209 | depends on X86_32 |
1da177e4 LT |
210 | help |
211 | This adds the CPUFreq driver for certain mobile Intel Pentium III | |
388d6c51 | 212 | (Coppermine), all mobile Intel Pentium III-M (Tualatin) |
1da177e4 LT |
213 | on systems which have an Intel 440BX/ZX/MX southbridge. |
214 | ||
215 | For details, take a look at <file:Documentation/cpu-freq/>. | |
216 | ||
217 | If in doubt, say N. | |
218 | ||
219 | config X86_P4_CLOCKMOD | |
220 | tristate "Intel Pentium 4 clock modulation" | |
1da177e4 LT |
221 | help |
222 | This adds the CPUFreq driver for Intel Pentium 4 / XEON | |
e8ef9522 SR |
223 | processors. When enabled it will lower CPU temperature by skipping |
224 | clocks. | |
225 | ||
226 | This driver should be only used in exceptional | |
227 | circumstances when very low power is needed because it causes severe | |
228 | slowdowns and noticeable latencies. Normally Speedstep should be used | |
229 | instead. | |
230 | ||
231 | To compile this driver as a module, choose M here: the | |
232 | module will be called p4-clockmod. | |
1da177e4 LT |
233 | |
234 | For details, take a look at <file:Documentation/cpu-freq/>. | |
235 | ||
e8ef9522 | 236 | Unless you are absolutely sure say N. |
1da177e4 LT |
237 | |
238 | config X86_CPUFREQ_NFORCE2 | |
239 | tristate "nVidia nForce2 FSB changing" | |
0f194b56 | 240 | depends on X86_32 |
1da177e4 LT |
241 | help |
242 | This adds the CPUFreq driver for FSB changing on nVidia nForce2 | |
243 | platforms. | |
244 | ||
245 | For details, take a look at <file:Documentation/cpu-freq/>. | |
246 | ||
247 | If in doubt, say N. | |
248 | ||
249 | config X86_LONGRUN | |
250 | tristate "Transmeta LongRun" | |
e8ef9522 | 251 | depends on X86_32 |
1da177e4 LT |
252 | help |
253 | This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors | |
254 | which support LongRun. | |
255 | ||
256 | For details, take a look at <file:Documentation/cpu-freq/>. | |
257 | ||
258 | If in doubt, say N. | |
259 | ||
260 | config X86_LONGHAUL | |
261 | tristate "VIA Cyrix III Longhaul" | |
e8ef9522 | 262 | depends on X86_32 && ACPI_PROCESSOR |
1da177e4 | 263 | help |
388d6c51 DJ |
264 | This adds the CPUFreq driver for VIA Samuel/CyrixIII, |
265 | VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T | |
1da177e4 LT |
266 | processors. |
267 | ||
268 | For details, take a look at <file:Documentation/cpu-freq/>. | |
269 | ||
270 | If in doubt, say N. | |
271 | ||