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

#
# x86 CPU Frequency scaling drivers
#

config X86_INTEL_PSTATE
       bool "Intel P state control"
       depends on X86
       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 perferred
          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"
	select CPU_FREQ_TABLE
	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 superseeded 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 ELAN_CPUFREQ
	tristate "AMD Elan SC400 and SC410"
	select CPU_FREQ_TABLE
	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"
	select CPU_FREQ_TABLE
	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!"
	select CPU_FREQ_TABLE
	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!"
	select CPU_FREQ_TABLE
	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!"
	select CPU_FREQ_TABLE
	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
	select CPU_FREQ_TABLE
	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 (availble 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 CPU_FREQ_TABLE
	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)"
	select CPU_FREQ_TABLE
	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)"
	select CPU_FREQ_TABLE
	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"
	select CPU_FREQ_TABLE
	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"
	select CPU_FREQ_TABLE
	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 DB	7	depends on X86
	8	help
	9	This driver provides a P state for Intel core processors.
	10	The driver implements an internal governor and will become
	11	the scaling driver and governor for Sandy bridge processors.
	12
	13	When this driver is enabled it will become the perferred
	14	scaling driver for Sandy bridge processors.
	15
93f0822d DB	16	If in doubt, say N.
93f0822d DB	17
0f1d683f NC	18	config X86_PCC_CPUFREQ
	19	tristate "Processor Clocking Control interface driver"
	20	depends on ACPI && ACPI_PROCESSOR
	21	help
	22	This driver adds support for the PCC interface.
	23
	24	For details, take a look at:
	25	<file:Documentation/cpu-freq/pcc-cpufreq.txt>.
	26
	27	To compile this driver as a module, choose M here: the
	28	module will be called pcc-cpufreq.
	29
	30	If in doubt, say N.
	31
1da177e4 LT	32	config X86_ACPI_CPUFREQ
	33	tristate "ACPI Processor P-States driver"
	34	select CPU_FREQ_TABLE
	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
	56	file has now been superseeded by the more generic "boost" entry.
	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
1da177e4	61	config ELAN_CPUFREQ
bf6fc9fd	62	tristate "AMD Elan SC400 and SC410"
1da177e4	63	select CPU_FREQ_TABLE
ce9c99af	64	depends on MELAN
1da177e4 LT	65	---help---
	66	This adds the CPUFreq driver for AMD Elan SC400 and SC410
	67	processors.
	68
	69	You need to specify the processor maximum speed as boot
	70	parameter: elanfreq=maxspeed (in kHz) or as module
	71	parameter "max_freq".
	72
	73	For details, take a look at <file:Documentation/cpu-freq/>.
	74
	75	If in doubt, say N.
	76
bf6fc9fd DJ	77	config SC520_CPUFREQ
	78	tristate "AMD Elan SC520"
	79	select CPU_FREQ_TABLE
ce9c99af	80	depends on MELAN
bf6fc9fd DJ	81	---help---
	82	This adds the CPUFreq driver for AMD Elan SC520 processor.
	83
	84	For details, take a look at <file:Documentation/cpu-freq/>.
	85
	86	If in doubt, say N.
	87
	88
1da177e4 LT	89	config X86_POWERNOW_K6
	90	tristate "AMD Mobile K6-2/K6-3 PowerNow!"
	91	select CPU_FREQ_TABLE
e8ef9522	92	depends on X86_32
1da177e4 LT	93	help
	94	This adds the CPUFreq driver for mobile AMD K6-2+ and mobile
	95	AMD K6-3+ processors.
	96
	97	For details, take a look at <file:Documentation/cpu-freq/>.
	98
	99	If in doubt, say N.
	100
	101	config X86_POWERNOW_K7
	102	tristate "AMD Mobile Athlon/Duron PowerNow!"
	103	select CPU_FREQ_TABLE
e8ef9522	104	depends on X86_32
1da177e4 LT	105	help
	106	This adds the CPUFreq driver for mobile AMD K7 mobile processors.
	107
	108	For details, take a look at <file:Documentation/cpu-freq/>.
	109
	110	If in doubt, say N.
	111
	112	config X86_POWERNOW_K7_ACPI
	113	bool
	114	depends on X86_POWERNOW_K7 && ACPI_PROCESSOR
	115	depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m)
e8ef9522	116	depends on X86_32
1da177e4 LT	117	default y
	118
	119	config X86_POWERNOW_K8
	120	tristate "AMD Opteron/Athlon64 PowerNow!"
	121	select CPU_FREQ_TABLE
631e8ac1	122	depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ
1da177e4	123	help
034be8fd AP	124	This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors.
034be8fd AP	125	Support for K10 and newer processors is now in acpi-cpufreq.
1da177e4	126
e8ef9522 SR	127	To compile this driver as a module, choose M here: the
	128	module will be called powernow-k8.
	129
1da177e4 LT	130	For details, take a look at <file:Documentation/cpu-freq/>.
1da177e4 LT	131
9c5320c8 JS	132	config X86_AMD_FREQ_SENSITIVITY
	133	tristate "AMD frequency sensitivity feedback powersave bias"
	134	depends on CPU_FREQ_GOV_ONDEMAND && X86_ACPI_CPUFREQ && CPU_SUP_AMD
dbcc9f84	135	select CPU_FREQ_TABLE
9c5320c8 JS	136	help
	137	This adds AMD-specific powersave bias function to the ondemand
	138	governor, which allows it to make more power-conscious frequency
	139	change decisions based on feedback from hardware (availble on AMD
	140	Family 16h and above).
	141
	142	Hardware feedback tells software how "sensitive" to frequency changes
	143	the CPUs' workloads are. CPU-bound workloads will be more sensitive
	144	-- they will perform better as frequency increases. Memory/IO-bound
	145	workloads will be less sensitive -- they will not necessarily perform
	146	better as frequency increases.
	147
	148	If in doubt, say N.
	149
1da177e4 LT	150	config X86_GX_SUSPMOD
1da177e4 LT	151	tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
e8ef9522	152	depends on X86_32 && PCI
1da177e4 LT	153	help
	154	This add the CPUFreq driver for NatSemi Geode processors which
	155	support suspend modulation.
	156
	157	For details, take a look at <file:Documentation/cpu-freq/>.
	158
	159	If in doubt, say N.
	160
	161	config X86_SPEEDSTEP_CENTRINO
e8ef9522	162	tristate "Intel Enhanced SpeedStep (deprecated)"
1da177e4	163	select CPU_FREQ_TABLE
e8ef9522 SR	164	select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
e8ef9522 SR	165	depends on X86_32 \|\| (X86_64 && ACPI_PROCESSOR)
1da177e4	166	help
e8ef9522 SR	167	This is deprecated and this functionality is now merged into
	168	acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
	169	speedstep_centrino.
1da177e4	170	This adds the CPUFreq driver for Enhanced SpeedStep enabled
e8ef9522 SR	171	mobile CPUs. This means Intel Pentium M (Centrino) CPUs
	172	or 64bit enabled Intel Xeons.
	173
	174	To compile this driver as a module, choose M here: the
	175	module will be called speedstep-centrino.
388d6c51	176
1da177e4	177	For details, take a look at <file:Documentation/cpu-freq/>.
388d6c51	178
1da177e4 LT	179	If in doubt, say N.
1da177e4 LT	180
1da177e4 LT	181	config X86_SPEEDSTEP_CENTRINO_TABLE
1da177e4 LT	182	bool "Built-in tables for Banias CPUs"
e8ef9522	183	depends on X86_32 && X86_SPEEDSTEP_CENTRINO
1da177e4 LT	184	default y
	185	help
	186	Use built-in tables for Banias CPUs if ACPI encoding
	187	is not available.
	188
	189	If in doubt, say N.
	190
	191	config X86_SPEEDSTEP_ICH
	192	tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
	193	select CPU_FREQ_TABLE
e8ef9522	194	depends on X86_32
1da177e4 LT	195	help
	196	This adds the CPUFreq driver for certain mobile Intel Pentium III
	197	(Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
388d6c51	198	mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
1da177e4 LT	199	ICH3 or ICH4 southbridge.
	200
	201	For details, take a look at <file:Documentation/cpu-freq/>.
	202
	203	If in doubt, say N.
	204
	205	config X86_SPEEDSTEP_SMI
	206	tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
	207	select CPU_FREQ_TABLE
0f194b56	208	depends on X86_32
1da177e4 LT	209	help
1da177e4 LT	210	This adds the CPUFreq driver for certain mobile Intel Pentium III
388d6c51	211	(Coppermine), all mobile Intel Pentium III-M (Tualatin)
1da177e4 LT	212	on systems which have an Intel 440BX/ZX/MX southbridge.
	213
	214	For details, take a look at <file:Documentation/cpu-freq/>.
	215
	216	If in doubt, say N.
	217
	218	config X86_P4_CLOCKMOD
	219	tristate "Intel Pentium 4 clock modulation"
	220	select CPU_FREQ_TABLE
	221	help
	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"
	262	select CPU_FREQ_TABLE
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