2 # CPU Frequency scaling
5 menu "CPU Frequency scaling"
7 source "drivers/cpufreq/Kconfig"
11 comment "CPUFreq processor drivers"
13 config X86_ACPI_CPUFREQ
14 tristate "ACPI Processor P-States driver"
16 depends on ACPI_PROCESSOR
18 This driver adds a CPUFreq driver which utilizes the ACPI
19 Processor Performance States.
21 For details, take a look at <file:Documentation/cpu-freq/>.
30 This adds the CPUFreq driver for AMD Elan SC400 and SC410
33 You need to specify the processor maximum speed as boot
34 parameter: elanfreq=maxspeed (in kHz) or as module
37 For details, take a look at <file:Documentation/cpu-freq/>.
41 config X86_POWERNOW_K6
42 tristate "AMD Mobile K6-2/K6-3 PowerNow!"
45 This adds the CPUFreq driver for mobile AMD K6-2+ and mobile
48 For details, take a look at <file:Documentation/cpu-freq/>.
52 config X86_POWERNOW_K7
53 tristate "AMD Mobile Athlon/Duron PowerNow!"
56 This adds the CPUFreq driver for mobile AMD K7 mobile processors.
58 For details, take a look at <file:Documentation/cpu-freq/>.
62 config X86_POWERNOW_K7_ACPI
64 depends on X86_POWERNOW_K7 && ACPI_PROCESSOR
65 depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m)
68 config X86_POWERNOW_K8
69 tristate "AMD Opteron/Athlon64 PowerNow!"
71 depends on EXPERIMENTAL
73 This adds the CPUFreq driver for mobile AMD Opteron/Athlon64 processors.
75 For details, take a look at <file:Documentation/cpu-freq/>.
79 config X86_POWERNOW_K8_ACPI
81 depends on X86_POWERNOW_K8 && ACPI_PROCESSOR
82 depends on !(X86_POWERNOW_K8 = y && ACPI_PROCESSOR = m)
86 tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
88 This add the CPUFreq driver for NatSemi Geode processors which
89 support suspend modulation.
91 For details, take a look at <file:Documentation/cpu-freq/>.
95 config X86_SPEEDSTEP_CENTRINO
96 tristate "Intel Enhanced SpeedStep"
98 select X86_SPEEDSTEP_CENTRINO_TABLE if (!X86_SPEEDSTEP_CENTRINO_ACPI)
100 This adds the CPUFreq driver for Enhanced SpeedStep enabled
101 mobile CPUs. This means Intel Pentium M (Centrino) CPUs. However,
102 you also need to say Y to "Use ACPI tables to decode..." below
103 [which might imply enabling ACPI] if you want to use this driver
106 For details, take a look at <file:Documentation/cpu-freq/>.
110 config X86_SPEEDSTEP_CENTRINO_ACPI
111 bool "Use ACPI tables to decode valid frequency/voltage pairs"
112 depends on X86_SPEEDSTEP_CENTRINO && ACPI_PROCESSOR
113 depends on !(X86_SPEEDSTEP_CENTRINO = y && ACPI_PROCESSOR = m)
116 Use primarily the information provided in the BIOS ACPI tables
117 to determine valid CPU frequency and voltage pairings. It is
118 required for the driver to work on non-Banias CPUs.
122 config X86_SPEEDSTEP_CENTRINO_TABLE
123 bool "Built-in tables for Banias CPUs"
124 depends on X86_SPEEDSTEP_CENTRINO
127 Use built-in tables for Banias CPUs if ACPI encoding
132 config X86_SPEEDSTEP_ICH
133 tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
134 select CPU_FREQ_TABLE
136 This adds the CPUFreq driver for certain mobile Intel Pentium III
137 (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
138 mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
139 ICH3 or ICH4 southbridge.
141 For details, take a look at <file:Documentation/cpu-freq/>.
145 config X86_SPEEDSTEP_SMI
146 tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
147 select CPU_FREQ_TABLE
148 depends on EXPERIMENTAL
150 This adds the CPUFreq driver for certain mobile Intel Pentium III
151 (Coppermine), all mobile Intel Pentium III-M (Tualatin)
152 on systems which have an Intel 440BX/ZX/MX southbridge.
154 For details, take a look at <file:Documentation/cpu-freq/>.
158 config X86_P4_CLOCKMOD
159 tristate "Intel Pentium 4 clock modulation"
160 select CPU_FREQ_TABLE
162 This adds the CPUFreq driver for Intel Pentium 4 / XEON
165 For details, take a look at <file:Documentation/cpu-freq/>.
169 config X86_CPUFREQ_NFORCE2
170 tristate "nVidia nForce2 FSB changing"
171 depends on EXPERIMENTAL
173 This adds the CPUFreq driver for FSB changing on nVidia nForce2
176 For details, take a look at <file:Documentation/cpu-freq/>.
181 tristate "Transmeta LongRun"
183 This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors
184 which support LongRun.
186 For details, take a look at <file:Documentation/cpu-freq/>.
191 tristate "VIA Cyrix III Longhaul"
192 select CPU_FREQ_TABLE
194 This adds the CPUFreq driver for VIA Samuel/CyrixIII,
195 VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
198 For details, take a look at <file:Documentation/cpu-freq/>.
202 comment "shared options"
204 config X86_ACPI_CPUFREQ_PROC_INTF
205 bool "/proc/acpi/processor/../performance interface (deprecated)"
207 depends on X86_ACPI_CPUFREQ || X86_SPEEDSTEP_CENTRINO_ACPI || X86_POWERNOW_K7_ACPI || X86_POWERNOW_K8_ACPI
209 This enables the deprecated /proc/acpi/processor/../performance
210 interface. While it is helpful for debugging, the generic,
211 cross-architecture cpufreq interfaces should be used.
215 config X86_SPEEDSTEP_LIB
217 default X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD
219 config X86_SPEEDSTEP_RELAXED_CAP_CHECK
220 bool "Relaxed speedstep capability checks"
221 depends on (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH)
223 Don't perform all checks for a speedstep capable system which would
224 normally be done. Some ancient or strange systems, though speedstep
225 capable, don't always indicate that they are speedstep capable. This
226 option lets the probing code bypass some of those checks if the
227 parameter "relaxed_check=1" is passed to the module.