[deliverable/linux.git] / drivers / cpufreq / Kconfig.x86

#
# x86 CPU Frequency scaling drivers
#

config X86_INTEL_PSTATE
       bool "Intel P state control"
       depends on X86
       select ACPI_PROCESSOR if ACPI
       help
          This driver provides a P state for Intel core processors.
	  The driver implements an internal governor and will become
          the scaling driver and governor for Sandy bridge processors.

	  When this driver is enabled it will become the preferred
          scaling driver for Sandy bridge processors.

	  If in doubt, say N.

config X86_PCC_CPUFREQ
	tristate "Processor Clocking Control interface driver"
	depends on ACPI && ACPI_PROCESSOR
	help
	  This driver adds support for the PCC interface.

	  For details, take a look at:
	  <file:Documentation/cpu-freq/pcc-cpufreq.txt>.

	  To compile this driver as a module, choose M here: the
	  module will be called pcc-cpufreq.

	  If in doubt, say N.

config X86_ACPI_CPUFREQ
	tristate "ACPI Processor P-States driver"
	depends on ACPI_PROCESSOR
	help
	  This driver adds a CPUFreq driver which utilizes the ACPI
	  Processor Performance States.
	  This driver also supports Intel Enhanced Speedstep and newer
	  AMD CPUs.

	  To compile this driver as a module, choose M here: the
	  module will be called acpi-cpufreq.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config X86_ACPI_CPUFREQ_CPB
	default y
	bool "Legacy cpb sysfs knob support for AMD CPUs"
	depends on X86_ACPI_CPUFREQ && CPU_SUP_AMD
	help
	  The powernow-k8 driver used to provide a sysfs knob called "cpb"
	  to disable the Core Performance Boosting feature of AMD CPUs. This
	  file has now been superseded by the more generic "boost" entry.

	  By enabling this option the acpi_cpufreq driver provides the old
	  entry in addition to the new boost ones, for compatibility reasons.

config X86_SFI_CPUFREQ
	tristate "SFI Performance-States driver"
	depends on X86_INTEL_MID && SFI
	help
	  This adds a CPUFreq driver for some Silvermont based Intel Atom
	  architectures like Z34xx and Z35xx which enumerate processor
	  performance states through SFI.

	  If in doubt, say N.

config ELAN_CPUFREQ
	tristate "AMD Elan SC400 and SC410"
	depends on MELAN
	---help---
	  This adds the CPUFreq driver for AMD Elan SC400 and SC410
	  processors.

	  You need to specify the processor maximum speed as boot
	  parameter: elanfreq=maxspeed (in kHz) or as module
	  parameter "max_freq".

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config SC520_CPUFREQ
	tristate "AMD Elan SC520"
	depends on MELAN
	---help---
	  This adds the CPUFreq driver for AMD Elan SC520 processor.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.


config X86_POWERNOW_K6
	tristate "AMD Mobile K6-2/K6-3 PowerNow!"
	depends on X86_32
	help
	  This adds the CPUFreq driver for mobile AMD K6-2+ and mobile
	  AMD K6-3+ processors.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config X86_POWERNOW_K7
	tristate "AMD Mobile Athlon/Duron PowerNow!"
	depends on X86_32
	help
	  This adds the CPUFreq driver for mobile AMD K7 mobile processors.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config X86_POWERNOW_K7_ACPI
	bool
	depends on X86_POWERNOW_K7 && ACPI_PROCESSOR
	depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m)
	depends on X86_32
	default y

config X86_POWERNOW_K8
	tristate "AMD Opteron/Athlon64 PowerNow!"
	depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ
	help
	  This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors.
	  Support for K10 and newer processors is now in acpi-cpufreq.

	  To compile this driver as a module, choose M here: the
	  module will be called powernow-k8.

	  For details, take a look at <file:Documentation/cpu-freq/>.

config X86_AMD_FREQ_SENSITIVITY
	tristate "AMD frequency sensitivity feedback powersave bias"
	depends on CPU_FREQ_GOV_ONDEMAND && X86_ACPI_CPUFREQ && CPU_SUP_AMD
	help
	  This adds AMD-specific powersave bias function to the ondemand
	  governor, which allows it to make more power-conscious frequency
	  change decisions based on feedback from hardware (available on AMD
	  Family 16h and above).

	  Hardware feedback tells software how "sensitive" to frequency changes
	  the CPUs' workloads are. CPU-bound workloads will be more sensitive
	  -- they will perform better as frequency increases. Memory/IO-bound
	  workloads will be less sensitive -- they will not necessarily perform
	  better as frequency increases.

	  If in doubt, say N.

config X86_GX_SUSPMOD
	tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
	depends on X86_32 && PCI
	help
	 This add the CPUFreq driver for NatSemi Geode processors which
	 support suspend modulation.

	 For details, take a look at <file:Documentation/cpu-freq/>.

	 If in doubt, say N.

config X86_SPEEDSTEP_CENTRINO
	tristate "Intel Enhanced SpeedStep (deprecated)"
	select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
	depends on X86_32 || (X86_64 && ACPI_PROCESSOR)
	help
	  This is deprecated and this functionality is now merged into
	  acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
	  speedstep_centrino.
	  This adds the CPUFreq driver for Enhanced SpeedStep enabled
	  mobile CPUs.  This means Intel Pentium M (Centrino) CPUs
	  or 64bit enabled Intel Xeons.

	  To compile this driver as a module, choose M here: the
	  module will be called speedstep-centrino.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config X86_SPEEDSTEP_CENTRINO_TABLE
	bool "Built-in tables for Banias CPUs"
	depends on X86_32 && X86_SPEEDSTEP_CENTRINO
	default y
	help
	  Use built-in tables for Banias CPUs if ACPI encoding
	  is not available.

	  If in doubt, say N.

config X86_SPEEDSTEP_ICH
	tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
	depends on X86_32
	help
	  This adds the CPUFreq driver for certain mobile Intel Pentium III
	  (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
	  mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
	  ICH3 or ICH4 southbridge.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config X86_SPEEDSTEP_SMI
	tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
	depends on X86_32
	help
	  This adds the CPUFreq driver for certain mobile Intel Pentium III
	  (Coppermine), all mobile Intel Pentium III-M (Tualatin)
	  on systems which have an Intel 440BX/ZX/MX southbridge.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config X86_P4_CLOCKMOD
	tristate "Intel Pentium 4 clock modulation"
	help
	  This adds the CPUFreq driver for Intel Pentium 4 / XEON
	  processors.  When enabled it will lower CPU temperature by skipping
	  clocks.

	  This driver should be only used in exceptional
	  circumstances when very low power is needed because it causes severe
	  slowdowns and noticeable latencies.  Normally Speedstep should be used
	  instead.

	  To compile this driver as a module, choose M here: the
	  module will be called p4-clockmod.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  Unless you are absolutely sure say N.

config X86_CPUFREQ_NFORCE2
	tristate "nVidia nForce2 FSB changing"
	depends on X86_32
	help
	  This adds the CPUFreq driver for FSB changing on nVidia nForce2
	  platforms.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config X86_LONGRUN
	tristate "Transmeta LongRun"
	depends on X86_32
	help
	  This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors
	  which support LongRun.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config X86_LONGHAUL
	tristate "VIA Cyrix III Longhaul"
	depends on X86_32 && ACPI_PROCESSOR
	help
	  This adds the CPUFreq driver for VIA Samuel/CyrixIII,
	  VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
	  processors.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.
Commit	Line	Data
1da177e4	1	#
bb0a56ec	2	# x86 CPU Frequency scaling drivers
1da177e4 LT	3	#
1da177e4 LT	4
93f0822d	5	config X86_INTEL_PSTATE
da0d9fda	6	bool "Intel P state control"
93f0822d	7	depends on X86
9522a2ff	8	select ACPI_PROCESSOR if ACPI
93f0822d DB	9	help
	10	This driver provides a P state for Intel core processors.
	11	The driver implements an internal governor and will become
	12	the scaling driver and governor for Sandy bridge processors.
	13
735dc249	14	When this driver is enabled it will become the preferred
93f0822d DB	15	scaling driver for Sandy bridge processors.
93f0822d DB	16
93f0822d DB	17	If in doubt, say N.
93f0822d DB	18
0f1d683f NC	19	config X86_PCC_CPUFREQ
	20	tristate "Processor Clocking Control interface driver"
	21	depends on ACPI && ACPI_PROCESSOR
	22	help
	23	This driver adds support for the PCC interface.
	24
	25	For details, take a look at:
	26	<file:Documentation/cpu-freq/pcc-cpufreq.txt>.
	27
	28	To compile this driver as a module, choose M here: the
	29	module will be called pcc-cpufreq.
	30
	31	If in doubt, say N.
	32
1da177e4 LT	33	config X86_ACPI_CPUFREQ
1da177e4 LT	34	tristate "ACPI Processor P-States driver"
1da177e4 LT	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
3dc9a633 MG	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
735dc249	56	file has now been superseded by the more generic "boost" entry.
11269ff5 AP	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
e7ddf4b7 SK	61	config X86_SFI_CPUFREQ
	62	tristate "SFI Performance-States driver"
	63	depends on X86_INTEL_MID && SFI
	64	help
	65	This adds a CPUFreq driver for some Silvermont based Intel Atom
	66	architectures like Z34xx and Z35xx which enumerate processor
	67	performance states through SFI.
	68
	69	If in doubt, say N.
	70
1da177e4	71	config ELAN_CPUFREQ
bf6fc9fd	72	tristate "AMD Elan SC400 and SC410"
ce9c99af	73	depends on MELAN
1da177e4 LT	74	---help---
	75	This adds the CPUFreq driver for AMD Elan SC400 and SC410
	76	processors.
	77
	78	You need to specify the processor maximum speed as boot
	79	parameter: elanfreq=maxspeed (in kHz) or as module
	80	parameter "max_freq".
	81
	82	For details, take a look at <file:Documentation/cpu-freq/>.
	83
	84	If in doubt, say N.
	85
bf6fc9fd DJ	86	config SC520_CPUFREQ
bf6fc9fd DJ	87	tristate "AMD Elan SC520"
ce9c99af	88	depends on MELAN
bf6fc9fd DJ	89	---help---
	90	This adds the CPUFreq driver for AMD Elan SC520 processor.
	91
	92	For details, take a look at <file:Documentation/cpu-freq/>.
	93
	94	If in doubt, say N.
	95
	96
1da177e4 LT	97	config X86_POWERNOW_K6
1da177e4 LT	98	tristate "AMD Mobile K6-2/K6-3 PowerNow!"
e8ef9522	99	depends on X86_32
1da177e4 LT	100	help
	101	This adds the CPUFreq driver for mobile AMD K6-2+ and mobile
	102	AMD K6-3+ processors.
	103
	104	For details, take a look at <file:Documentation/cpu-freq/>.
	105
	106	If in doubt, say N.
	107
	108	config X86_POWERNOW_K7
	109	tristate "AMD Mobile Athlon/Duron PowerNow!"
e8ef9522	110	depends on X86_32
1da177e4 LT	111	help
	112	This adds the CPUFreq driver for mobile AMD K7 mobile processors.
	113
	114	For details, take a look at <file:Documentation/cpu-freq/>.
	115
	116	If in doubt, say N.
	117
	118	config X86_POWERNOW_K7_ACPI
	119	bool
	120	depends on X86_POWERNOW_K7 && ACPI_PROCESSOR
	121	depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m)
e8ef9522	122	depends on X86_32
1da177e4 LT	123	default y
	124
	125	config X86_POWERNOW_K8
	126	tristate "AMD Opteron/Athlon64 PowerNow!"
631e8ac1	127	depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ
1da177e4	128	help
034be8fd AP	129	This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors.
034be8fd AP	130	Support for K10 and newer processors is now in acpi-cpufreq.
1da177e4	131
e8ef9522 SR	132	To compile this driver as a module, choose M here: the
	133	module will be called powernow-k8.
	134
1da177e4 LT	135	For details, take a look at <file:Documentation/cpu-freq/>.
1da177e4 LT	136
9c5320c8 JS	137	config X86_AMD_FREQ_SENSITIVITY
	138	tristate "AMD frequency sensitivity feedback powersave bias"
	139	depends on CPU_FREQ_GOV_ONDEMAND && X86_ACPI_CPUFREQ && CPU_SUP_AMD
	140	help
	141	This adds AMD-specific powersave bias function to the ondemand
	142	governor, which allows it to make more power-conscious frequency
8c88126b	143	change decisions based on feedback from hardware (available on AMD
9c5320c8 JS	144	Family 16h and above).
	145
	146	Hardware feedback tells software how "sensitive" to frequency changes
	147	the CPUs' workloads are. CPU-bound workloads will be more sensitive
	148	-- they will perform better as frequency increases. Memory/IO-bound
	149	workloads will be less sensitive -- they will not necessarily perform
	150	better as frequency increases.
	151
	152	If in doubt, say N.
	153
1da177e4 LT	154	config X86_GX_SUSPMOD
1da177e4 LT	155	tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
e8ef9522	156	depends on X86_32 && PCI
1da177e4 LT	157	help
	158	This add the CPUFreq driver for NatSemi Geode processors which
	159	support suspend modulation.
	160
	161	For details, take a look at <file:Documentation/cpu-freq/>.
	162
	163	If in doubt, say N.
	164
	165	config X86_SPEEDSTEP_CENTRINO
e8ef9522	166	tristate "Intel Enhanced SpeedStep (deprecated)"
e8ef9522 SR	167	select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
e8ef9522 SR	168	depends on X86_32 \|\| (X86_64 && ACPI_PROCESSOR)
1da177e4	169	help
e8ef9522 SR	170	This is deprecated and this functionality is now merged into
	171	acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
	172	speedstep_centrino.
1da177e4	173	This adds the CPUFreq driver for Enhanced SpeedStep enabled
e8ef9522 SR	174	mobile CPUs. This means Intel Pentium M (Centrino) CPUs
	175	or 64bit enabled Intel Xeons.
	176
	177	To compile this driver as a module, choose M here: the
	178	module will be called speedstep-centrino.
388d6c51	179
1da177e4	180	For details, take a look at <file:Documentation/cpu-freq/>.
388d6c51	181
1da177e4 LT	182	If in doubt, say N.
1da177e4 LT	183
1da177e4 LT	184	config X86_SPEEDSTEP_CENTRINO_TABLE
1da177e4 LT	185	bool "Built-in tables for Banias CPUs"
e8ef9522	186	depends on X86_32 && X86_SPEEDSTEP_CENTRINO
1da177e4 LT	187	default y
	188	help
	189	Use built-in tables for Banias CPUs if ACPI encoding
	190	is not available.
	191
	192	If in doubt, say N.
	193
	194	config X86_SPEEDSTEP_ICH
	195	tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
e8ef9522	196	depends on X86_32
1da177e4 LT	197	help
	198	This adds the CPUFreq driver for certain mobile Intel Pentium III
	199	(Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
388d6c51	200	mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
1da177e4 LT	201	ICH3 or ICH4 southbridge.
	202
	203	For details, take a look at <file:Documentation/cpu-freq/>.
	204
	205	If in doubt, say N.
	206
	207	config X86_SPEEDSTEP_SMI
	208	tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
0f194b56	209	depends on X86_32
1da177e4 LT	210	help
1da177e4 LT	211	This adds the CPUFreq driver for certain mobile Intel Pentium III
388d6c51	212	(Coppermine), all mobile Intel Pentium III-M (Tualatin)
1da177e4 LT	213	on systems which have an Intel 440BX/ZX/MX southbridge.
	214
	215	For details, take a look at <file:Documentation/cpu-freq/>.
	216
	217	If in doubt, say N.
	218
	219	config X86_P4_CLOCKMOD
	220	tristate "Intel Pentium 4 clock modulation"
1da177e4 LT	221	help
1da177e4 LT	222	This adds the CPUFreq driver for Intel Pentium 4 / XEON
e8ef9522 SR	223	processors. When enabled it will lower CPU temperature by skipping
	224	clocks.
	225
	226	This driver should be only used in exceptional
	227	circumstances when very low power is needed because it causes severe
	228	slowdowns and noticeable latencies. Normally Speedstep should be used
	229	instead.
	230
	231	To compile this driver as a module, choose M here: the
	232	module will be called p4-clockmod.
1da177e4 LT	233
	234	For details, take a look at <file:Documentation/cpu-freq/>.
	235
e8ef9522	236	Unless you are absolutely sure say N.
1da177e4 LT	237
	238	config X86_CPUFREQ_NFORCE2
	239	tristate "nVidia nForce2 FSB changing"
0f194b56	240	depends on X86_32
1da177e4 LT	241	help
	242	This adds the CPUFreq driver for FSB changing on nVidia nForce2
	243	platforms.
	244
	245	For details, take a look at <file:Documentation/cpu-freq/>.
	246
	247	If in doubt, say N.
	248
	249	config X86_LONGRUN
	250	tristate "Transmeta LongRun"
e8ef9522	251	depends on X86_32
1da177e4 LT	252	help
	253	This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors
	254	which support LongRun.
	255
	256	For details, take a look at <file:Documentation/cpu-freq/>.
	257
	258	If in doubt, say N.
	259
	260	config X86_LONGHAUL
	261	tristate "VIA Cyrix III Longhaul"
e8ef9522	262	depends on X86_32 && ACPI_PROCESSOR
1da177e4	263	help
388d6c51 DJ	264	This adds the CPUFreq driver for VIA Samuel/CyrixIII,
388d6c51 DJ	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