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735dc249 | 55 | file has now been superseded by the more generic "boost" entry.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