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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 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 | ||
13 | When this driver is enabled it will become the perferred | |
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" | |
34 | select CPU_FREQ_TABLE | |
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 | |
56 | file has now been superseeded by the more generic "boost" entry. | |
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 | ||
1da177e4 | 61 | config ELAN_CPUFREQ |
bf6fc9fd | 62 | tristate "AMD Elan SC400 and SC410" |
1da177e4 | 63 | select CPU_FREQ_TABLE |
ce9c99af | 64 | depends on MELAN |
1da177e4 LT |
65 | ---help--- |
66 | This adds the CPUFreq driver for AMD Elan SC400 and SC410 | |
67 | processors. | |
68 | ||
69 | You need to specify the processor maximum speed as boot | |
70 | parameter: elanfreq=maxspeed (in kHz) or as module | |
71 | parameter "max_freq". | |
72 | ||
73 | For details, take a look at <file:Documentation/cpu-freq/>. | |
74 | ||
75 | If in doubt, say N. | |
76 | ||
bf6fc9fd DJ |
77 | config SC520_CPUFREQ |
78 | tristate "AMD Elan SC520" | |
79 | select CPU_FREQ_TABLE | |
ce9c99af | 80 | depends on MELAN |
bf6fc9fd DJ |
81 | ---help--- |
82 | This adds the CPUFreq driver for AMD Elan SC520 processor. | |
83 | ||
84 | For details, take a look at <file:Documentation/cpu-freq/>. | |
85 | ||
86 | If in doubt, say N. | |
87 | ||
88 | ||
1da177e4 LT |
89 | config X86_POWERNOW_K6 |
90 | tristate "AMD Mobile K6-2/K6-3 PowerNow!" | |
91 | select CPU_FREQ_TABLE | |
e8ef9522 | 92 | depends on X86_32 |
1da177e4 LT |
93 | help |
94 | This adds the CPUFreq driver for mobile AMD K6-2+ and mobile | |
95 | AMD K6-3+ processors. | |
96 | ||
97 | For details, take a look at <file:Documentation/cpu-freq/>. | |
98 | ||
99 | If in doubt, say N. | |
100 | ||
101 | config X86_POWERNOW_K7 | |
102 | tristate "AMD Mobile Athlon/Duron PowerNow!" | |
103 | select CPU_FREQ_TABLE | |
e8ef9522 | 104 | depends on X86_32 |
1da177e4 LT |
105 | help |
106 | This adds the CPUFreq driver for mobile AMD K7 mobile processors. | |
107 | ||
108 | For details, take a look at <file:Documentation/cpu-freq/>. | |
109 | ||
110 | If in doubt, say N. | |
111 | ||
112 | config X86_POWERNOW_K7_ACPI | |
113 | bool | |
114 | depends on X86_POWERNOW_K7 && ACPI_PROCESSOR | |
115 | depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m) | |
e8ef9522 | 116 | depends on X86_32 |
1da177e4 LT |
117 | default y |
118 | ||
119 | config X86_POWERNOW_K8 | |
120 | tristate "AMD Opteron/Athlon64 PowerNow!" | |
121 | select CPU_FREQ_TABLE | |
631e8ac1 | 122 | depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ |
1da177e4 | 123 | help |
034be8fd AP |
124 | This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors. |
125 | Support for K10 and newer processors is now in acpi-cpufreq. | |
1da177e4 | 126 | |
e8ef9522 SR |
127 | To compile this driver as a module, choose M here: the |
128 | module will be called powernow-k8. | |
129 | ||
1da177e4 LT |
130 | For details, take a look at <file:Documentation/cpu-freq/>. |
131 | ||
9c5320c8 JS |
132 | config X86_AMD_FREQ_SENSITIVITY |
133 | tristate "AMD frequency sensitivity feedback powersave bias" | |
134 | depends on CPU_FREQ_GOV_ONDEMAND && X86_ACPI_CPUFREQ && CPU_SUP_AMD | |
135 | help | |
136 | This adds AMD-specific powersave bias function to the ondemand | |
137 | governor, which allows it to make more power-conscious frequency | |
138 | change decisions based on feedback from hardware (availble on AMD | |
139 | Family 16h and above). | |
140 | ||
141 | Hardware feedback tells software how "sensitive" to frequency changes | |
142 | the CPUs' workloads are. CPU-bound workloads will be more sensitive | |
143 | -- they will perform better as frequency increases. Memory/IO-bound | |
144 | workloads will be less sensitive -- they will not necessarily perform | |
145 | better as frequency increases. | |
146 | ||
147 | If in doubt, say N. | |
148 | ||
1da177e4 LT |
149 | config X86_GX_SUSPMOD |
150 | tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation" | |
e8ef9522 | 151 | depends on X86_32 && PCI |
1da177e4 LT |
152 | help |
153 | This add the CPUFreq driver for NatSemi Geode processors which | |
154 | support suspend modulation. | |
155 | ||
156 | For details, take a look at <file:Documentation/cpu-freq/>. | |
157 | ||
158 | If in doubt, say N. | |
159 | ||
160 | config X86_SPEEDSTEP_CENTRINO | |
e8ef9522 | 161 | tristate "Intel Enhanced SpeedStep (deprecated)" |
1da177e4 | 162 | select CPU_FREQ_TABLE |
e8ef9522 SR |
163 | select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32 |
164 | depends on X86_32 || (X86_64 && ACPI_PROCESSOR) | |
1da177e4 | 165 | help |
e8ef9522 SR |
166 | This is deprecated and this functionality is now merged into |
167 | acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of | |
168 | speedstep_centrino. | |
1da177e4 | 169 | This adds the CPUFreq driver for Enhanced SpeedStep enabled |
e8ef9522 SR |
170 | mobile CPUs. This means Intel Pentium M (Centrino) CPUs |
171 | or 64bit enabled Intel Xeons. | |
172 | ||
173 | To compile this driver as a module, choose M here: the | |
174 | module will be called speedstep-centrino. | |
388d6c51 | 175 | |
1da177e4 | 176 | For details, take a look at <file:Documentation/cpu-freq/>. |
388d6c51 | 177 | |
1da177e4 LT |
178 | If in doubt, say N. |
179 | ||
1da177e4 LT |
180 | config X86_SPEEDSTEP_CENTRINO_TABLE |
181 | bool "Built-in tables for Banias CPUs" | |
e8ef9522 | 182 | depends on X86_32 && X86_SPEEDSTEP_CENTRINO |
1da177e4 LT |
183 | default y |
184 | help | |
185 | Use built-in tables for Banias CPUs if ACPI encoding | |
186 | is not available. | |
187 | ||
188 | If in doubt, say N. | |
189 | ||
190 | config X86_SPEEDSTEP_ICH | |
191 | tristate "Intel Speedstep on ICH-M chipsets (ioport interface)" | |
192 | select CPU_FREQ_TABLE | |
e8ef9522 | 193 | depends on X86_32 |
1da177e4 LT |
194 | help |
195 | This adds the CPUFreq driver for certain mobile Intel Pentium III | |
196 | (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all | |
388d6c51 | 197 | mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2, |
1da177e4 LT |
198 | ICH3 or ICH4 southbridge. |
199 | ||
200 | For details, take a look at <file:Documentation/cpu-freq/>. | |
201 | ||
202 | If in doubt, say N. | |
203 | ||
204 | config X86_SPEEDSTEP_SMI | |
205 | tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)" | |
206 | select CPU_FREQ_TABLE | |
0f194b56 | 207 | depends on X86_32 |
1da177e4 LT |
208 | help |
209 | This adds the CPUFreq driver for certain mobile Intel Pentium III | |
388d6c51 | 210 | (Coppermine), all mobile Intel Pentium III-M (Tualatin) |
1da177e4 LT |
211 | on systems which have an Intel 440BX/ZX/MX southbridge. |
212 | ||
213 | For details, take a look at <file:Documentation/cpu-freq/>. | |
214 | ||
215 | If in doubt, say N. | |
216 | ||
217 | config X86_P4_CLOCKMOD | |
218 | tristate "Intel Pentium 4 clock modulation" | |
219 | select CPU_FREQ_TABLE | |
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" | |
261 | select CPU_FREQ_TABLE | |
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 | ||