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 perferred 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 superseeded 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 ELAN_CPUFREQ 61 tristate "AMD Elan SC400 and SC410" 62 depends on MELAN 63 ---help--- 64 This adds the CPUFreq driver for AMD Elan SC400 and SC410 65 processors. 66 67 You need to specify the processor maximum speed as boot 68 parameter: elanfreq=maxspeed (in kHz) or as module 69 parameter "max_freq". 70 71 For details, take a look at <file:Documentation/cpu-freq/>. 72 73 If in doubt, say N. 74 75config SC520_CPUFREQ 76 tristate "AMD Elan SC520" 77 depends on MELAN 78 ---help--- 79 This adds the CPUFreq driver for AMD Elan SC520 processor. 80 81 For details, take a look at <file:Documentation/cpu-freq/>. 82 83 If in doubt, say N. 84 85 86config X86_POWERNOW_K6 87 tristate "AMD Mobile K6-2/K6-3 PowerNow!" 88 depends on X86_32 89 help 90 This adds the CPUFreq driver for mobile AMD K6-2+ and mobile 91 AMD K6-3+ processors. 92 93 For details, take a look at <file:Documentation/cpu-freq/>. 94 95 If in doubt, say N. 96 97config X86_POWERNOW_K7 98 tristate "AMD Mobile Athlon/Duron PowerNow!" 99 depends on X86_32 100 help 101 This adds the CPUFreq driver for mobile AMD K7 mobile 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_ACPI 108 bool 109 depends on X86_POWERNOW_K7 && ACPI_PROCESSOR 110 depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m) 111 depends on X86_32 112 default y 113 114config X86_POWERNOW_K8 115 tristate "AMD Opteron/Athlon64 PowerNow!" 116 depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ 117 help 118 This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors. 119 Support for K10 and newer processors is now in acpi-cpufreq. 120 121 To compile this driver as a module, choose M here: the 122 module will be called powernow-k8. 123 124 For details, take a look at <file:Documentation/cpu-freq/>. 125 126config X86_AMD_FREQ_SENSITIVITY 127 tristate "AMD frequency sensitivity feedback powersave bias" 128 depends on CPU_FREQ_GOV_ONDEMAND && X86_ACPI_CPUFREQ && CPU_SUP_AMD 129 help 130 This adds AMD-specific powersave bias function to the ondemand 131 governor, which allows it to make more power-conscious frequency 132 change decisions based on feedback from hardware (available on AMD 133 Family 16h and above). 134 135 Hardware feedback tells software how "sensitive" to frequency changes 136 the CPUs' workloads are. CPU-bound workloads will be more sensitive 137 -- they will perform better as frequency increases. Memory/IO-bound 138 workloads will be less sensitive -- they will not necessarily perform 139 better as frequency increases. 140 141 If in doubt, say N. 142 143config X86_GX_SUSPMOD 144 tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation" 145 depends on X86_32 && PCI 146 help 147 This add the CPUFreq driver for NatSemi Geode processors which 148 support suspend modulation. 149 150 For details, take a look at <file:Documentation/cpu-freq/>. 151 152 If in doubt, say N. 153 154config X86_SPEEDSTEP_CENTRINO 155 tristate "Intel Enhanced SpeedStep (deprecated)" 156 select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32 157 depends on X86_32 || (X86_64 && ACPI_PROCESSOR) 158 help 159 This is deprecated and this functionality is now merged into 160 acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of 161 speedstep_centrino. 162 This adds the CPUFreq driver for Enhanced SpeedStep enabled 163 mobile CPUs. This means Intel Pentium M (Centrino) CPUs 164 or 64bit enabled Intel Xeons. 165 166 To compile this driver as a module, choose M here: the 167 module will be called speedstep-centrino. 168 169 For details, take a look at <file:Documentation/cpu-freq/>. 170 171 If in doubt, say N. 172 173config X86_SPEEDSTEP_CENTRINO_TABLE 174 bool "Built-in tables for Banias CPUs" 175 depends on X86_32 && X86_SPEEDSTEP_CENTRINO 176 default y 177 help 178 Use built-in tables for Banias CPUs if ACPI encoding 179 is not available. 180 181 If in doubt, say N. 182 183config X86_SPEEDSTEP_ICH 184 tristate "Intel Speedstep on ICH-M chipsets (ioport interface)" 185 depends on X86_32 186 help 187 This adds the CPUFreq driver for certain mobile Intel Pentium III 188 (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all 189 mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2, 190 ICH3 or ICH4 southbridge. 191 192 For details, take a look at <file:Documentation/cpu-freq/>. 193 194 If in doubt, say N. 195 196config X86_SPEEDSTEP_SMI 197 tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)" 198 depends on X86_32 199 help 200 This adds the CPUFreq driver for certain mobile Intel Pentium III 201 (Coppermine), all mobile Intel Pentium III-M (Tualatin) 202 on systems which have an Intel 440BX/ZX/MX southbridge. 203 204 For details, take a look at <file:Documentation/cpu-freq/>. 205 206 If in doubt, say N. 207 208config X86_P4_CLOCKMOD 209 tristate "Intel Pentium 4 clock modulation" 210 help 211 This adds the CPUFreq driver for Intel Pentium 4 / XEON 212 processors. When enabled it will lower CPU temperature by skipping 213 clocks. 214 215 This driver should be only used in exceptional 216 circumstances when very low power is needed because it causes severe 217 slowdowns and noticeable latencies. Normally Speedstep should be used 218 instead. 219 220 To compile this driver as a module, choose M here: the 221 module will be called p4-clockmod. 222 223 For details, take a look at <file:Documentation/cpu-freq/>. 224 225 Unless you are absolutely sure say N. 226 227config X86_CPUFREQ_NFORCE2 228 tristate "nVidia nForce2 FSB changing" 229 depends on X86_32 230 help 231 This adds the CPUFreq driver for FSB changing on nVidia nForce2 232 platforms. 233 234 For details, take a look at <file:Documentation/cpu-freq/>. 235 236 If in doubt, say N. 237 238config X86_LONGRUN 239 tristate "Transmeta LongRun" 240 depends on X86_32 241 help 242 This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors 243 which support LongRun. 244 245 For details, take a look at <file:Documentation/cpu-freq/>. 246 247 If in doubt, say N. 248 249config X86_LONGHAUL 250 tristate "VIA Cyrix III Longhaul" 251 depends on X86_32 && ACPI_PROCESSOR 252 help 253 This adds the CPUFreq driver for VIA Samuel/CyrixIII, 254 VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T 255 processors. 256 257 For details, take a look at <file:Documentation/cpu-freq/>. 258 259 If in doubt, say N. 260 261config X86_E_POWERSAVER 262 tristate "VIA C7 Enhanced PowerSaver (DANGEROUS)" 263 depends on X86_32 && ACPI_PROCESSOR 264 help 265 This adds the CPUFreq driver for VIA C7 processors. However, this driver 266 does not have any safeguards to prevent operating the CPU out of spec 267 and is thus considered dangerous. Please use the regular ACPI cpufreq 268 driver, enabled by CONFIG_X86_ACPI_CPUFREQ. 269 270 If in doubt, say N. 271 272comment "shared options" 273 274config X86_SPEEDSTEP_LIB 275 tristate 276 default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD) 277 278config X86_SPEEDSTEP_RELAXED_CAP_CHECK 279 bool "Relaxed speedstep capability checks" 280 depends on X86_32 && (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH) 281 help 282 Don't perform all checks for a speedstep capable system which would 283 normally be done. Some ancient or strange systems, though speedstep 284 capable, don't always indicate that they are speedstep capable. This 285 option lets the probing code bypass some of those checks if the 286 parameter "relaxed_check=1" is passed to the module. 287 288