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1#
2# CPU Frequency scaling
3#
4
5menu "CPU Frequency scaling"
6
7source "drivers/cpufreq/Kconfig"
8
9if CPU_FREQ
10
11comment "CPUFreq processor drivers"
12
13config X86_POWERNOW_K8
14 tristate "AMD Opteron/Athlon64 PowerNow!"
15 select CPU_FREQ_TABLE
16 help
17 This adds the CPUFreq driver for mobile AMD Opteron/Athlon64 processors.
18
19 To compile this driver as a module, choose M here: the
20 module will be called powernow-k8.
21
22 For details, take a look at <file:Documentation/cpu-freq/>.
23
24 If in doubt, say N.
25
26config X86_POWERNOW_K8_ACPI
27 bool
28 depends on X86_POWERNOW_K8 && ACPI_PROCESSOR
29 depends on !(X86_POWERNOW_K8 = y && ACPI_PROCESSOR = m)
30 default y
31
32config X86_SPEEDSTEP_CENTRINO
33 tristate "Intel Enhanced SpeedStep (deprecated)"
34 select CPU_FREQ_TABLE
35 depends on ACPI_PROCESSOR
36 help
37 This is deprecated and this functionality is now merged into
38 acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
39 speedstep_centrino.
40 This adds the CPUFreq driver for Enhanced SpeedStep enabled
41 mobile CPUs. This means Intel Pentium M (Centrino) CPUs
42 or 64bit enabled Intel Xeons.
43
44 To compile this driver as a module, choose M here: the
45 module will be called speedstep-centrino.
46
47 For details, take a look at <file:Documentation/cpu-freq/>.
48
49 If in doubt, say N.
50
51config X86_ACPI_CPUFREQ
52 tristate "ACPI Processor P-States driver"
53 select CPU_FREQ_TABLE
54 depends on ACPI_PROCESSOR
55 help
56 This driver adds a CPUFreq driver which utilizes the ACPI
57 Processor Performance States.
58 This driver also supports Intel Enhanced Speedstep.
59
60 To compile this driver as a module, choose M here: the
61 module will be called acpi-cpufreq.
62
63 For details, take a look at <file:Documentation/cpu-freq/>.
64
65 If in doubt, say N.
66
67comment "shared options"
68
69config X86_ACPI_CPUFREQ_PROC_INTF
70 bool "/proc/acpi/processor/../performance interface (deprecated)"
71 depends on PROC_FS
72 depends on X86_ACPI_CPUFREQ || X86_POWERNOW_K8_ACPI
73 help
74 This enables the deprecated /proc/acpi/processor/../performance
75 interface. While it is helpful for debugging, the generic,
76 cross-architecture cpufreq interfaces should be used.
77
78 If in doubt, say N.
79
80config X86_P4_CLOCKMOD
81 tristate "Intel Pentium 4 clock modulation"
82 depends on EMBEDDED
83 select CPU_FREQ_TABLE
84 help
85 This adds the clock modulation driver for Intel Pentium 4 / XEON
86 processors. When enabled it will lower CPU temperature by skipping
87 clocks.
88
89 This driver should be only used in exceptional
90 circumstances when very low power is needed because it causes severe
91 slowdowns and noticeable latencies. Normally Speedstep should be used
92 instead.
93
94 To compile this driver as a module, choose M here: the
95 module will be called p4-clockmod.
96
97 For details, take a look at <file:Documentation/cpu-freq/>.
98
99 Unless you are absolutely sure say N.
100
101
102config X86_SPEEDSTEP_LIB
103 tristate
104 default X86_P4_CLOCKMOD
105
106endif
107
108endmenu