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.
20 This driver also supports Intel Enhanced Speedstep.
22 For details, take a look at <file:Documentation/cpu-freq/>.
27 tristate "AMD Elan SC400 and SC410"
31 This adds the CPUFreq driver for AMD Elan SC400 and SC410
34 You need to specify the processor maximum speed as boot
35 parameter: elanfreq=maxspeed (in kHz) or as module
38 For details, take a look at <file:Documentation/cpu-freq/>.
43 tristate "AMD Elan SC520"
47 This adds the CPUFreq driver for AMD Elan SC520 processor.
49 For details, take a look at <file:Documentation/cpu-freq/>.
54 config X86_POWERNOW_K6
55 tristate "AMD Mobile K6-2/K6-3 PowerNow!"
58 This adds the CPUFreq driver for mobile AMD K6-2+ and mobile
61 For details, take a look at <file:Documentation/cpu-freq/>.
65 config X86_POWERNOW_K7
66 tristate "AMD Mobile Athlon/Duron PowerNow!"
69 This adds the CPUFreq driver for mobile AMD K7 mobile processors.
71 For details, take a look at <file:Documentation/cpu-freq/>.
75 config X86_POWERNOW_K7_ACPI
77 depends on X86_POWERNOW_K7 && ACPI_PROCESSOR
78 depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m)
81 config X86_POWERNOW_K8
82 tristate "AMD Opteron/Athlon64 PowerNow!"
84 depends on EXPERIMENTAL
86 This adds the CPUFreq driver for mobile AMD Opteron/Athlon64 processors.
88 For details, take a look at <file:Documentation/cpu-freq/>.
92 config X86_POWERNOW_K8_ACPI
94 depends on X86_POWERNOW_K8 && ACPI_PROCESSOR
95 depends on !(X86_POWERNOW_K8 = y && ACPI_PROCESSOR = m)
99 tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
102 This add the CPUFreq driver for NatSemi Geode processors which
103 support suspend modulation.
105 For details, take a look at <file:Documentation/cpu-freq/>.
109 config X86_SPEEDSTEP_CENTRINO
110 tristate "Intel Enhanced SpeedStep"
111 select CPU_FREQ_TABLE
112 select X86_SPEEDSTEP_CENTRINO_TABLE if (!X86_SPEEDSTEP_CENTRINO_ACPI)
114 This adds the CPUFreq driver for Enhanced SpeedStep enabled
115 mobile CPUs. This means Intel Pentium M (Centrino) CPUs. However,
116 you also need to say Y to "Use ACPI tables to decode..." below
117 [which might imply enabling ACPI] if you want to use this driver
120 For details, take a look at <file:Documentation/cpu-freq/>.
124 config X86_SPEEDSTEP_CENTRINO_ACPI
125 bool "Use ACPI tables to decode valid frequency/voltage (deprecated)"
126 depends on X86_SPEEDSTEP_CENTRINO && ACPI_PROCESSOR
127 depends on !(X86_SPEEDSTEP_CENTRINO = y && ACPI_PROCESSOR = m)
130 This is deprecated and this functionality is now merged into
131 acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
133 Use primarily the information provided in the BIOS ACPI tables
134 to determine valid CPU frequency and voltage pairings. It is
135 required for the driver to work on non-Banias CPUs.
139 config X86_SPEEDSTEP_CENTRINO_TABLE
140 bool "Built-in tables for Banias CPUs"
141 depends on X86_SPEEDSTEP_CENTRINO
144 Use built-in tables for Banias CPUs if ACPI encoding
149 config X86_SPEEDSTEP_ICH
150 tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
151 select CPU_FREQ_TABLE
153 This adds the CPUFreq driver for certain mobile Intel Pentium III
154 (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
155 mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
156 ICH3 or ICH4 southbridge.
158 For details, take a look at <file:Documentation/cpu-freq/>.
162 config X86_SPEEDSTEP_SMI
163 tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
164 select CPU_FREQ_TABLE
165 depends on EXPERIMENTAL
167 This adds the CPUFreq driver for certain mobile Intel Pentium III
168 (Coppermine), all mobile Intel Pentium III-M (Tualatin)
169 on systems which have an Intel 440BX/ZX/MX southbridge.
171 For details, take a look at <file:Documentation/cpu-freq/>.
175 config X86_P4_CLOCKMOD
176 tristate "Intel Pentium 4 clock modulation"
177 select CPU_FREQ_TABLE
179 This adds the CPUFreq driver for Intel Pentium 4 / XEON
182 For details, take a look at <file:Documentation/cpu-freq/>.
186 config X86_CPUFREQ_NFORCE2
187 tristate "nVidia nForce2 FSB changing"
188 depends on EXPERIMENTAL
190 This adds the CPUFreq driver for FSB changing on nVidia nForce2
193 For details, take a look at <file:Documentation/cpu-freq/>.
198 tristate "Transmeta LongRun"
200 This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors
201 which support LongRun.
203 For details, take a look at <file:Documentation/cpu-freq/>.
208 tristate "VIA Cyrix III Longhaul"
209 select CPU_FREQ_TABLE
210 depends on ACPI_PROCESSOR
212 This adds the CPUFreq driver for VIA Samuel/CyrixIII,
213 VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
216 For details, take a look at <file:Documentation/cpu-freq/>.
220 comment "shared options"
222 config X86_ACPI_CPUFREQ_PROC_INTF
223 bool "/proc/acpi/processor/../performance interface (deprecated)"
225 depends on X86_ACPI_CPUFREQ || X86_SPEEDSTEP_CENTRINO_ACPI || X86_POWERNOW_K7_ACPI || X86_POWERNOW_K8_ACPI
227 This enables the deprecated /proc/acpi/processor/../performance
228 interface. While it is helpful for debugging, the generic,
229 cross-architecture cpufreq interfaces should be used.
233 config X86_SPEEDSTEP_LIB
235 default X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD
237 config X86_SPEEDSTEP_RELAXED_CAP_CHECK
238 bool "Relaxed speedstep capability checks"
239 depends on (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH)
241 Don't perform all checks for a speedstep capable system which would
242 normally be done. Some ancient or strange systems, though speedstep
243 capable, don't always indicate that they are speedstep capable. This
244 option lets the probing code bypass some of those checks if the
245 parameter "relaxed_check=1" is passed to the module.