1# 2# x86 CPU Frequency scaling drivers 3# 4 5config X86_INTEL_PSTATE 6 bool "Intel P state control" 7 depends on X86 8 select ACPI_PROCESSOR if ACPI 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 14 When this driver is enabled it will become the preferred 15 scaling driver for Sandy bridge processors. 16 17 If in doubt, say N. 18 19config 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 33config X86_ACPI_CPUFREQ 34 tristate "ACPI Processor P-States driver" 35 depends on ACPI_PROCESSOR 36 help 37 This driver adds a CPUFreq driver which utilizes the ACPI 38 Processor Performance States. 39 This driver also supports Intel Enhanced Speedstep and newer 40 AMD CPUs. 41 42 To compile this driver as a module, choose M here: the 43 module will be called acpi-cpufreq. 44 45 For details, take a look at <file:Documentation/cpu-freq/>. 46 47 If in doubt, say N. 48 49config 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 This 56 file has now been superseded by the more generic "boost" entry. 57 58 By enabling this option the acpi_cpufreq driver provides the old 59 entry in addition to the new boost ones, for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 61config 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 71config ELAN_CPUFREQ 72 tristate "AMD Elan SC400 and SC410" 73 depends on MELAN 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 86config SC520_CPUFREQ 87 tristate "AMD Elan SC520" 88 depends on MELAN 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 97config X86_POWERNOW_K6 98 tristate "AMD Mobile K6-2/K6-3 PowerNow!" 99 depends on X86_32 100 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 108config X86_POWERNOW_K7 109 tristate "AMD Mobile Athlon/Duron PowerNow!" 110 depends on X86_32 111 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 118config X86_POWERNOW_K7_ACPI 119 bool 120 depends on X86_POWERNOW_K7 && ACPI_PROCESSOR 121 depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m) 122 depends on X86_32 123 default y 124 125config X86_POWERNOW_K8 126 tristate "AMD Opteron/Athlon64 PowerNow!" 127 depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ 128 help 129 This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors. 130 Support for K10 and newer processors is now in acpi-cpufreq. 131 132 To compile this driver as a module, choose M here: the 133 module will be called powernow-k8. 134 135 For details, take a look at <file:Documentation/cpu-freq/>. 136 137config 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 143 change decisions based on feedback from hardware (available on AMD 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 154config X86_GX_SUSPMOD 155 tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation" 156 depends on X86_32 && PCI 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 165config X86_SPEEDSTEP_CENTRINO 166 tristate "Intel Enhanced SpeedStep (deprecated)" 167 select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32 168 depends on X86_32 || (X86_64 && ACPI_PROCESSOR) 169 help 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. 173 This adds the CPUFreq driver for Enhanced SpeedStep enabled 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. 179 180 For details, take a look at <file:Documentation/cpu-freq/>. 181 182 If in doubt, say N. 183 184config X86_SPEEDSTEP_CENTRINO_TABLE 185 bool "Built-in tables for Banias CPUs" 186 depends on X86_32 && X86_SPEEDSTEP_CENTRINO 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 194config X86_SPEEDSTEP_ICH 195 tristate "Intel Speedstep on ICH-M chipsets (ioport interface)" 196 depends on X86_32 197 help 198 This adds the CPUFreq driver for certain mobile Intel Pentium III 199 (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all 200 mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2, 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 207config X86_SPEEDSTEP_SMI 208 tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)" 209 depends on X86_32 210 help 211 This adds the CPUFreq driver for certain mobile Intel Pentium III 212 (Coppermine), all mobile Intel Pentium III-M (Tualatin) 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 219config X86_P4_CLOCKMOD 220 tristate "Intel Pentium 4 clock modulation" 221 help 222 This adds the CPUFreq driver for Intel Pentium 4 / XEON 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. 233 234 For details, take a look at <file:Documentation/cpu-freq/>. 235 236 Unless you are absolutely sure say N. 237 238config X86_CPUFREQ_NFORCE2 239 tristate "nVidia nForce2 FSB changing" 240 depends on X86_32 241 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 249config X86_LONGRUN 250 tristate "Transmeta LongRun" 251 depends on X86_32 252 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 260config X86_LONGHAUL 261 tristate "VIA Cyrix III Longhaul" 262 depends on X86_32 && ACPI_PROCESSOR 263 help 264 This adds the CPUFreq driver for VIA Samuel/CyrixIII, 265 VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T 266 processors. 267 268 For details, take a look at <file:Documentation/cpu-freq/>. 269 270 If in doubt, say N. 271 272config X86_E_POWERSAVER 273 tristate "VIA C7 Enhanced PowerSaver (DANGEROUS)" 274 depends on X86_32 && ACPI_PROCESSOR 275 help 276 This adds the CPUFreq driver for VIA C7 processors. However, this driver 277 does not have any safeguards to prevent operating the CPU out of spec 278 and is thus considered dangerous. Please use the regular ACPI cpufreq 279 driver, enabled by CONFIG_X86_ACPI_CPUFREQ. 280 281 If in doubt, say N. 282 283comment "shared options" 284 285config X86_SPEEDSTEP_LIB 286 tristate 287 default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD) 288 289config X86_SPEEDSTEP_RELAXED_CAP_CHECK 290 bool "Relaxed speedstep capability checks" 291 depends on X86_32 && (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH) 292 help 293 Don't perform all checks for a speedstep capable system which would 294 normally be done. Some ancient or strange systems, though speedstep 295 capable, don't always indicate that they are speedstep capable. This 296 option lets the probing code bypass some of those checks if the 297 parameter "relaxed_check=1" is passed to the module. 298 299