[mirror_ubuntu-artful-kernel.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
       select ACPI_CPPC_LIB if X86_64 && ACPI && SCHED_MC_PRIO
       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	  file has now been superseded by the more generic "boost" entry.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
de966cf4	9	select ACPI_CPPC_LIB if X86_64 && ACPI && SCHED_MC_PRIO
93f0822d DB	10	help
	11	This driver provides a P state for Intel core processors.
	12	The driver implements an internal governor and will become
	13	the scaling driver and governor for Sandy bridge processors.
	14
735dc249	15	When this driver is enabled it will become the preferred
93f0822d DB	16	scaling driver for Sandy bridge processors.
93f0822d DB	17
93f0822d DB	18	If in doubt, say N.
93f0822d DB	19
0f1d683f NC	20	config X86_PCC_CPUFREQ
	21	tristate "Processor Clocking Control interface driver"
	22	depends on ACPI && ACPI_PROCESSOR
	23	help
	24	This driver adds support for the PCC interface.
	25
	26	For details, take a look at:
	27	<file:Documentation/cpu-freq/pcc-cpufreq.txt>.
	28
	29	To compile this driver as a module, choose M here: the
	30	module will be called pcc-cpufreq.
	31
	32	If in doubt, say N.
	33
1da177e4 LT	34	config X86_ACPI_CPUFREQ
1da177e4 LT	35	tristate "ACPI Processor P-States driver"
1da177e4 LT	36	depends on ACPI_PROCESSOR
	37	help
	38	This driver adds a CPUFreq driver which utilizes the ACPI
	39	Processor Performance States.
3dc9a633 MG	40	This driver also supports Intel Enhanced Speedstep and newer
3dc9a633 MG	41	AMD CPUs.
1da177e4	42
e8ef9522 SR	43	To compile this driver as a module, choose M here: the
	44	module will be called acpi-cpufreq.
	45
1da177e4 LT	46	For details, take a look at <file:Documentation/cpu-freq/>.
	47
	48	If in doubt, say N.
	49
11269ff5 AP	50	config X86_ACPI_CPUFREQ_CPB
	51	default y
	52	bool "Legacy cpb sysfs knob support for AMD CPUs"
	53	depends on X86_ACPI_CPUFREQ && CPU_SUP_AMD
	54	help
	55	The powernow-k8 driver used to provide a sysfs knob called "cpb"
	56	to disable the Core Performance Boosting feature of AMD CPUs. This
735dc249	57	file has now been superseded by the more generic "boost" entry.
11269ff5 AP	58
	59	By enabling this option the acpi_cpufreq driver provides the old
	60	entry in addition to the new boost ones, for compatibility reasons.
	61
e7ddf4b7 SK	62	config X86_SFI_CPUFREQ
	63	tristate "SFI Performance-States driver"
	64	depends on X86_INTEL_MID && SFI
	65	help
	66	This adds a CPUFreq driver for some Silvermont based Intel Atom
	67	architectures like Z34xx and Z35xx which enumerate processor
	68	performance states through SFI.
	69
	70	If in doubt, say N.
	71
1da177e4	72	config ELAN_CPUFREQ
bf6fc9fd	73	tristate "AMD Elan SC400 and SC410"
ce9c99af	74	depends on MELAN
1da177e4 LT	75	---help---
	76	This adds the CPUFreq driver for AMD Elan SC400 and SC410
	77	processors.
	78
	79	You need to specify the processor maximum speed as boot
	80	parameter: elanfreq=maxspeed (in kHz) or as module
	81	parameter "max_freq".
	82
	83	For details, take a look at <file:Documentation/cpu-freq/>.
	84
	85	If in doubt, say N.
	86
bf6fc9fd DJ	87	config SC520_CPUFREQ
bf6fc9fd DJ	88	tristate "AMD Elan SC520"
ce9c99af	89	depends on MELAN
bf6fc9fd DJ	90	---help---
	91	This adds the CPUFreq driver for AMD Elan SC520 processor.
	92
	93	For details, take a look at <file:Documentation/cpu-freq/>.
	94
	95	If in doubt, say N.
	96
	97
1da177e4 LT	98	config X86_POWERNOW_K6
1da177e4 LT	99	tristate "AMD Mobile K6-2/K6-3 PowerNow!"
e8ef9522	100	depends on X86_32
1da177e4 LT	101	help
	102	This adds the CPUFreq driver for mobile AMD K6-2+ and mobile
	103	AMD K6-3+ processors.
	104
	105	For details, take a look at <file:Documentation/cpu-freq/>.
	106
	107	If in doubt, say N.
	108
	109	config X86_POWERNOW_K7
	110	tristate "AMD Mobile Athlon/Duron PowerNow!"
e8ef9522	111	depends on X86_32
1da177e4 LT	112	help
	113	This adds the CPUFreq driver for mobile AMD K7 mobile processors.
	114
	115	For details, take a look at <file:Documentation/cpu-freq/>.
	116
	117	If in doubt, say N.
	118
	119	config X86_POWERNOW_K7_ACPI
	120	bool
	121	depends on X86_POWERNOW_K7 && ACPI_PROCESSOR
	122	depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m)
e8ef9522	123	depends on X86_32
1da177e4 LT	124	default y
	125
	126	config X86_POWERNOW_K8
	127	tristate "AMD Opteron/Athlon64 PowerNow!"
631e8ac1	128	depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ
1da177e4	129	help
034be8fd AP	130	This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors.
034be8fd AP	131	Support for K10 and newer processors is now in acpi-cpufreq.
1da177e4	132
e8ef9522 SR	133	To compile this driver as a module, choose M here: the
	134	module will be called powernow-k8.
	135
1da177e4 LT	136	For details, take a look at <file:Documentation/cpu-freq/>.
1da177e4 LT	137
9c5320c8 JS	138	config X86_AMD_FREQ_SENSITIVITY
	139	tristate "AMD frequency sensitivity feedback powersave bias"
	140	depends on CPU_FREQ_GOV_ONDEMAND && X86_ACPI_CPUFREQ && CPU_SUP_AMD
	141	help
	142	This adds AMD-specific powersave bias function to the ondemand
	143	governor, which allows it to make more power-conscious frequency
8c88126b	144	change decisions based on feedback from hardware (available on AMD
9c5320c8 JS	145	Family 16h and above).
	146
	147	Hardware feedback tells software how "sensitive" to frequency changes
	148	the CPUs' workloads are. CPU-bound workloads will be more sensitive
	149	-- they will perform better as frequency increases. Memory/IO-bound
	150	workloads will be less sensitive -- they will not necessarily perform
	151	better as frequency increases.
	152
	153	If in doubt, say N.
	154
1da177e4 LT	155	config X86_GX_SUSPMOD
1da177e4 LT	156	tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
e8ef9522	157	depends on X86_32 && PCI
1da177e4 LT	158	help
	159	This add the CPUFreq driver for NatSemi Geode processors which
	160	support suspend modulation.
	161
	162	For details, take a look at <file:Documentation/cpu-freq/>.
	163
	164	If in doubt, say N.
	165
	166	config X86_SPEEDSTEP_CENTRINO
e8ef9522	167	tristate "Intel Enhanced SpeedStep (deprecated)"
e8ef9522 SR	168	select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
e8ef9522 SR	169	depends on X86_32 \|\| (X86_64 && ACPI_PROCESSOR)
1da177e4	170	help
e8ef9522 SR	171	This is deprecated and this functionality is now merged into
	172	acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
	173	speedstep_centrino.
1da177e4	174	This adds the CPUFreq driver for Enhanced SpeedStep enabled
e8ef9522 SR	175	mobile CPUs. This means Intel Pentium M (Centrino) CPUs
	176	or 64bit enabled Intel Xeons.
	177
	178	To compile this driver as a module, choose M here: the
	179	module will be called speedstep-centrino.
388d6c51	180
1da177e4	181	For details, take a look at <file:Documentation/cpu-freq/>.
388d6c51	182
1da177e4 LT	183	If in doubt, say N.
1da177e4 LT	184
1da177e4 LT	185	config X86_SPEEDSTEP_CENTRINO_TABLE
1da177e4 LT	186	bool "Built-in tables for Banias CPUs"
e8ef9522	187	depends on X86_32 && X86_SPEEDSTEP_CENTRINO
1da177e4 LT	188	default y
	189	help
	190	Use built-in tables for Banias CPUs if ACPI encoding
	191	is not available.
	192
	193	If in doubt, say N.
	194
	195	config X86_SPEEDSTEP_ICH
	196	tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
e8ef9522	197	depends on X86_32
1da177e4 LT	198	help
	199	This adds the CPUFreq driver for certain mobile Intel Pentium III
	200	(Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
388d6c51	201	mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
1da177e4 LT	202	ICH3 or ICH4 southbridge.
	203
	204	For details, take a look at <file:Documentation/cpu-freq/>.
	205
	206	If in doubt, say N.
	207
	208	config X86_SPEEDSTEP_SMI
	209	tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
0f194b56	210	depends on X86_32
1da177e4 LT	211	help
1da177e4 LT	212	This adds the CPUFreq driver for certain mobile Intel Pentium III
388d6c51	213	(Coppermine), all mobile Intel Pentium III-M (Tualatin)
1da177e4 LT	214	on systems which have an Intel 440BX/ZX/MX southbridge.
	215
	216	For details, take a look at <file:Documentation/cpu-freq/>.
	217
	218	If in doubt, say N.
	219
	220	config X86_P4_CLOCKMOD
	221	tristate "Intel Pentium 4 clock modulation"
1da177e4 LT	222	help
1da177e4 LT	223	This adds the CPUFreq driver for Intel Pentium 4 / XEON
e8ef9522 SR	224	processors. When enabled it will lower CPU temperature by skipping
	225	clocks.
	226
	227	This driver should be only used in exceptional
	228	circumstances when very low power is needed because it causes severe
	229	slowdowns and noticeable latencies. Normally Speedstep should be used
	230	instead.
	231
	232	To compile this driver as a module, choose M here: the
	233	module will be called p4-clockmod.
1da177e4 LT	234
	235	For details, take a look at <file:Documentation/cpu-freq/>.
	236
e8ef9522	237	Unless you are absolutely sure say N.
1da177e4 LT	238
	239	config X86_CPUFREQ_NFORCE2
	240	tristate "nVidia nForce2 FSB changing"
0f194b56	241	depends on X86_32
1da177e4 LT	242	help
	243	This adds the CPUFreq driver for FSB changing on nVidia nForce2
	244	platforms.
	245
	246	For details, take a look at <file:Documentation/cpu-freq/>.
	247
	248	If in doubt, say N.
	249
	250	config X86_LONGRUN
	251	tristate "Transmeta LongRun"
e8ef9522	252	depends on X86_32
1da177e4 LT	253	help
	254	This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors
	255	which support LongRun.
	256
	257	For details, take a look at <file:Documentation/cpu-freq/>.
	258
	259	If in doubt, say N.
	260
	261	config X86_LONGHAUL
	262	tristate "VIA Cyrix III Longhaul"
e8ef9522	263	depends on X86_32 && ACPI_PROCESSOR
1da177e4	264	help
388d6c51 DJ	265	This adds the CPUFreq driver for VIA Samuel/CyrixIII,
388d6c51 DJ	266	VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
1da177e4 LT	267	processors.
	268
	269	For details, take a look at <file:Documentation/cpu-freq/>.
	270
	271	If in doubt, say N.
	272