1# 2# x86 CPU Frequency scaling drivers 3# 4 5config X86_INTEL_PSTATE 6 bool "Intel P state control" 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 preferred 14 scaling driver for Sandy bridge processors. 15 16 If in doubt, say N. 17 18config 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 32config X86_ACPI_CPUFREQ 33 tristate "ACPI Processor P-States driver" 34 depends on ACPI_PROCESSOR 35 help 36 This driver adds a CPUFreq driver which utilizes the ACPI 37 Processor Performance States. 38 This driver also supports Intel Enhanced Speedstep and newer 39 AMD CPUs. 40 41 To compile this driver as a module, choose M here: the 42 module will be called acpi-cpufreq. 43 44 For details, take a look at <file:Documentation/cpu-freq/>. 45 46 If in doubt, say N. 47 48config X86_ACPI_CPUFREQ_CPB 49 default y 50 bool "Legacy cpb sysfs knob support for AMD CPUs" 51 depends on X86_ACPI_CPUFREQ && CPU_SUP_AMD 52 help 53 The powernow-k8 driver used to provide a sysfs knob called "cpb" 54 to disable the Core Performance Boosting feature of AMD CPUs. This 55 file has now been superseded by the more generic "boost" entry. 56 57 By enabling this option the acpi_cpufreq driver provides the old 58 entry in addition to the new boost ones, for compatibility reasons. 59 60config X86_SFI_CPUFREQ 61 tristate "SFI Performance-States driver" 62 depends on X86_INTEL_MID && SFI 63 help 64 This adds a CPUFreq driver for some Silvermont based Intel Atom 65 architectures like Z34xx and Z35xx which enumerate processor 66 performance states through SFI. 67 68 If in doubt, say N. 69 70config ELAN_CPUFREQ 71 tristate "AMD Elan SC400 and SC410" 72 depends on MELAN 73 ---help--- 74 This adds the CPUFreq driver for AMD Elan SC400 and SC410 75 processors. 76 77 You need to specify the processor maximum speed as boot 78 parameter: elanfreq=maxspeed (in kHz) or as module 79 parameter "max_freq". 80 81 For details, take a look at <file:Documentation/cpu-freq/>. 82 83 If in doubt, say N. 84 85config SC520_CPUFREQ 86 tristate "AMD Elan SC520" 87 depends on MELAN 88 ---help--- 89 This adds the CPUFreq driver for AMD Elan SC520 processor. 90 91 For details, take a look at <file:Documentation/cpu-freq/>. 92 93 If in doubt, say N. 94 95 96config X86_POWERNOW_K6 97 tristate "AMD Mobile K6-2/K6-3 PowerNow!" 98 depends on X86_32 99 help 100 This adds the CPUFreq driver for mobile AMD K6-2+ and mobile 101 AMD K6-3+ processors. 102 103 For details, take a look at <file:Documentation/cpu-freq/>. 104 105 If in doubt, say N. 106 107config X86_POWERNOW_K7 108 tristate "AMD Mobile Athlon/Duron PowerNow!" 109 depends on X86_32 110 help 111 This adds the CPUFreq driver for mobile AMD K7 mobile processors. 112 113 For details, take a look at <file:Documentation/cpu-freq/>. 114 115 If in doubt, say N. 116 117config X86_POWERNOW_K7_ACPI 118 bool 119 depends on X86_POWERNOW_K7 && ACPI_PROCESSOR 120 depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m) 121 depends on X86_32 122 default y 123 124config X86_POWERNOW_K8 125 tristate "AMD Opteron/Athlon64 PowerNow!" 126 depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ 127 help 128 This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors. 129 Support for K10 and newer processors is now in acpi-cpufreq. 130 131 To compile this driver as a module, choose M here: the 132 module will be called powernow-k8. 133 134 For details, take a look at <file:Documentation/cpu-freq/>. 135 136config X86_AMD_FREQ_SENSITIVITY 137 tristate "AMD frequency sensitivity feedback powersave bias" 138 depends on CPU_FREQ_GOV_ONDEMAND && X86_ACPI_CPUFREQ && CPU_SUP_AMD 139 help 140 This adds AMD-specific powersave bias function to the ondemand 141 governor, which allows it to make more power-conscious frequency 142 change decisions based on feedback from hardware (available on AMD 143 Family 16h and above). 144 145 Hardware feedback tells software how "sensitive" to frequency changes 146 the CPUs' workloads are. CPU-bound workloads will be more sensitive 147 -- they will perform better as frequency increases. Memory/IO-bound 148 workloads will be less sensitive -- they will not necessarily perform 149 better as frequency increases. 150 151 If in doubt, say N. 152 153config X86_GX_SUSPMOD 154 tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation" 155 depends on X86_32 && PCI 156 help 157 This add the CPUFreq driver for NatSemi Geode processors which 158 support suspend modulation. 159 160 For details, take a look at <file:Documentation/cpu-freq/>. 161 162 If in doubt, say N. 163 164config X86_SPEEDSTEP_CENTRINO 165 tristate "Intel Enhanced SpeedStep (deprecated)" 166 select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32 167 depends on X86_32 || (X86_64 && ACPI_PROCESSOR) 168 help 169 This is deprecated and this functionality is now merged into 170 acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of 171 speedstep_centrino. 172 This adds the CPUFreq driver for Enhanced SpeedStep enabled 173 mobile CPUs. This means Intel Pentium M (Centrino) CPUs 174 or 64bit enabled Intel Xeons. 175 176 To compile this driver as a module, choose M here: the 177 module will be called speedstep-centrino. 178 179 For details, take a look at <file:Documentation/cpu-freq/>. 180 181 If in doubt, say N. 182 183config X86_SPEEDSTEP_CENTRINO_TABLE 184 bool "Built-in tables for Banias CPUs" 185 depends on X86_32 && X86_SPEEDSTEP_CENTRINO 186 default y 187 help 188 Use built-in tables for Banias CPUs if ACPI encoding 189 is not available. 190 191 If in doubt, say N. 192 193config X86_SPEEDSTEP_ICH 194 tristate "Intel Speedstep on ICH-M chipsets (ioport interface)" 195 depends on X86_32 196 help 197 This adds the CPUFreq driver for certain mobile Intel Pentium III 198 (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all 199 mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2, 200 ICH3 or ICH4 southbridge. 201 202 For details, take a look at <file:Documentation/cpu-freq/>. 203 204 If in doubt, say N. 205 206config X86_SPEEDSTEP_SMI 207 tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)" 208 depends on X86_32 209 help 210 This adds the CPUFreq driver for certain mobile Intel Pentium III 211 (Coppermine), all mobile Intel Pentium III-M (Tualatin) 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 218config X86_P4_CLOCKMOD 219 tristate "Intel Pentium 4 clock modulation" 220 help 221 This adds the CPUFreq driver for Intel Pentium 4 / XEON 222 processors. When enabled it will lower CPU temperature by skipping 223 clocks. 224 225 This driver should be only used in exceptional 226 circumstances when very low power is needed because it causes severe 227 slowdowns and noticeable latencies. Normally Speedstep should be used 228 instead. 229 230 To compile this driver as a module, choose M here: the 231 module will be called p4-clockmod. 232 233 For details, take a look at <file:Documentation/cpu-freq/>. 234 235 Unless you are absolutely sure say N. 236 237config X86_CPUFREQ_NFORCE2 238 tristate "nVidia nForce2 FSB changing" 239 depends on X86_32 240 help 241 This adds the CPUFreq driver for FSB changing on nVidia nForce2 242 platforms. 243 244 For details, take a look at <file:Documentation/cpu-freq/>. 245 246 If in doubt, say N. 247 248config X86_LONGRUN 249 tristate "Transmeta LongRun" 250 depends on X86_32 251 help 252 This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors 253 which support LongRun. 254 255 For details, take a look at <file:Documentation/cpu-freq/>. 256 257 If in doubt, say N. 258 259config X86_LONGHAUL 260 tristate "VIA Cyrix III Longhaul" 261 depends on X86_32 && ACPI_PROCESSOR 262 help 263 This adds the CPUFreq driver for VIA Samuel/CyrixIII, 264 VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T 265 processors. 266 267 For details, take a look at <file:Documentation/cpu-freq/>. 268 269 If in doubt, say N. 270 271config X86_E_POWERSAVER 272 tristate "VIA C7 Enhanced PowerSaver (DANGEROUS)" 273 depends on X86_32 && ACPI_PROCESSOR 274 help 275 This adds the CPUFreq driver for VIA C7 processors. However, this driver 276 does not have any safeguards to prevent operating the CPU out of spec 277 and is thus considered dangerous. Please use the regular ACPI cpufreq 278 driver, enabled by CONFIG_X86_ACPI_CPUFREQ. 279 280 If in doubt, say N. 281 282comment "shared options" 283 284config X86_SPEEDSTEP_LIB 285 tristate 286 default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD) 287 288config X86_SPEEDSTEP_RELAXED_CAP_CHECK 289 bool "Relaxed speedstep capability checks" 290 depends on X86_32 && (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH) 291 help 292 Don't perform all checks for a speedstep capable system which would 293 normally be done. Some ancient or strange systems, though speedstep 294 capable, don't always indicate that they are speedstep capable. This 295 option lets the probing code bypass some of those checks if the 296 parameter "relaxed_check=1" is passed to the module. 297 298