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 select ACPI_CPPC_LIB if X86_64 && ACPI && SCHED_MC_PRIO 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 15 When this driver is enabled it will become the preferred 16 scaling driver for Sandy bridge processors. 17 18 If in doubt, say N. 19 20config 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 34config X86_ACPI_CPUFREQ 35 tristate "ACPI Processor P-States driver" 36 depends on ACPI_PROCESSOR 37 help 38 This driver adds a CPUFreq driver which utilizes the ACPI 39 Processor Performance States. 40 This driver also supports Intel Enhanced Speedstep and newer 41 AMD CPUs. 42 43 To compile this driver as a module, choose M here: the 44 module will be called acpi-cpufreq. 45 46 For details, take a look at <file:Documentation/cpu-freq/>. 47 48 If in doubt, say N. 49 50config 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 This 57 file has now been superseded by the more generic "boost" entry. 58 59 By enabling this option the acpi_cpufreq driver provides the old 60 entry in addition to the new boost ones, for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 62config 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 72config ELAN_CPUFREQ 73 tristate "AMD Elan SC400 and SC410" 74 depends on MELAN 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 87config SC520_CPUFREQ 88 tristate "AMD Elan SC520" 89 depends on MELAN 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 98config X86_POWERNOW_K6 99 tristate "AMD Mobile K6-2/K6-3 PowerNow!" 100 depends on X86_32 101 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 109config X86_POWERNOW_K7 110 tristate "AMD Mobile Athlon/Duron PowerNow!" 111 depends on X86_32 112 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 119config X86_POWERNOW_K7_ACPI 120 bool 121 depends on X86_POWERNOW_K7 && ACPI_PROCESSOR 122 depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m) 123 depends on X86_32 124 default y 125 126config X86_POWERNOW_K8 127 tristate "AMD Opteron/Athlon64 PowerNow!" 128 depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ 129 help 130 This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors. 131 Support for K10 and newer processors is now in acpi-cpufreq. 132 133 To compile this driver as a module, choose M here: the 134 module will be called powernow-k8. 135 136 For details, take a look at <file:Documentation/cpu-freq/>. 137 138config 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 144 change decisions based on feedback from hardware (available on AMD 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 155config X86_GX_SUSPMOD 156 tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation" 157 depends on X86_32 && PCI 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 166config X86_SPEEDSTEP_CENTRINO 167 tristate "Intel Enhanced SpeedStep (deprecated)" 168 select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32 169 depends on X86_32 || (X86_64 && ACPI_PROCESSOR) 170 help 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. 174 This adds the CPUFreq driver for Enhanced SpeedStep enabled 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. 180 181 For details, take a look at <file:Documentation/cpu-freq/>. 182 183 If in doubt, say N. 184 185config X86_SPEEDSTEP_CENTRINO_TABLE 186 bool "Built-in tables for Banias CPUs" 187 depends on X86_32 && X86_SPEEDSTEP_CENTRINO 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 195config X86_SPEEDSTEP_ICH 196 tristate "Intel Speedstep on ICH-M chipsets (ioport interface)" 197 depends on X86_32 198 help 199 This adds the CPUFreq driver for certain mobile Intel Pentium III 200 (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all 201 mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2, 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 208config X86_SPEEDSTEP_SMI 209 tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)" 210 depends on X86_32 211 help 212 This adds the CPUFreq driver for certain mobile Intel Pentium III 213 (Coppermine), all mobile Intel Pentium III-M (Tualatin) 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 220config X86_P4_CLOCKMOD 221 tristate "Intel Pentium 4 clock modulation" 222 help 223 This adds the CPUFreq driver for Intel Pentium 4 / XEON 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. 234 235 For details, take a look at <file:Documentation/cpu-freq/>. 236 237 Unless you are absolutely sure say N. 238 239config X86_CPUFREQ_NFORCE2 240 tristate "nVidia nForce2 FSB changing" 241 depends on X86_32 242 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 250config X86_LONGRUN 251 tristate "Transmeta LongRun" 252 depends on X86_32 253 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 261config X86_LONGHAUL 262 tristate "VIA Cyrix III Longhaul" 263 depends on X86_32 && ACPI_PROCESSOR 264 help 265 This adds the CPUFreq driver for VIA Samuel/CyrixIII, 266 VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T 267 processors. 268 269 For details, take a look at <file:Documentation/cpu-freq/>. 270 271 If in doubt, say N. 272 273config X86_E_POWERSAVER 274 tristate "VIA C7 Enhanced PowerSaver (DANGEROUS)" 275 depends on X86_32 && ACPI_PROCESSOR 276 help 277 This adds the CPUFreq driver for VIA C7 processors. However, this driver 278 does not have any safeguards to prevent operating the CPU out of spec 279 and is thus considered dangerous. Please use the regular ACPI cpufreq 280 driver, enabled by CONFIG_X86_ACPI_CPUFREQ. 281 282 If in doubt, say N. 283 284comment "shared options" 285 286config X86_SPEEDSTEP_LIB 287 tristate 288 default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD) 289 290config X86_SPEEDSTEP_RELAXED_CAP_CHECK 291 bool "Relaxed speedstep capability checks" 292 depends on X86_32 && (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH) 293 help 294 Don't perform all checks for a speedstep capable system which would 295 normally be done. Some ancient or strange systems, though speedstep 296 capable, don't always indicate that they are speedstep capable. This 297 option lets the probing code bypass some of those checks if the 298 parameter "relaxed_check=1" is passed to the module. 299 300