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 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. 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 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 61config ELAN_CPUFREQ 62 tristate "AMD Elan SC400 and SC410" 63 select CPU_FREQ_TABLE 64 depends on MELAN 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 77config SC520_CPUFREQ 78 tristate "AMD Elan SC520" 79 select CPU_FREQ_TABLE 80 depends on MELAN 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 89config X86_POWERNOW_K6 90 tristate "AMD Mobile K6-2/K6-3 PowerNow!" 91 select CPU_FREQ_TABLE 92 depends on X86_32 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 101config X86_POWERNOW_K7 102 tristate "AMD Mobile Athlon/Duron PowerNow!" 103 select CPU_FREQ_TABLE 104 depends on X86_32 105 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 112config X86_POWERNOW_K7_ACPI 113 bool 114 depends on X86_POWERNOW_K7 && ACPI_PROCESSOR 115 depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m) 116 depends on X86_32 117 default y 118 119config X86_POWERNOW_K8 120 tristate "AMD Opteron/Athlon64 PowerNow!" 121 select CPU_FREQ_TABLE 122 depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ 123 help 124 This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors. 125 Support for K10 and newer processors is now in acpi-cpufreq. 126 127 To compile this driver as a module, choose M here: the 128 module will be called powernow-k8. 129 130 For details, take a look at <file:Documentation/cpu-freq/>. 131 132config 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 135 help 136 This adds AMD-specific powersave bias function to the ondemand 137 governor, which allows it to make more power-conscious frequency 138 change decisions based on feedback from hardware (availble on AMD 139 Family 16h and above). 140 141 Hardware feedback tells software how "sensitive" to frequency changes 142 the CPUs' workloads are. CPU-bound workloads will be more sensitive 143 -- they will perform better as frequency increases. Memory/IO-bound 144 workloads will be less sensitive -- they will not necessarily perform 145 better as frequency increases. 146 147 If in doubt, say N. 148 149config X86_GX_SUSPMOD 150 tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation" 151 depends on X86_32 && PCI 152 help 153 This add the CPUFreq driver for NatSemi Geode processors which 154 support suspend modulation. 155 156 For details, take a look at <file:Documentation/cpu-freq/>. 157 158 If in doubt, say N. 159 160config X86_SPEEDSTEP_CENTRINO 161 tristate "Intel Enhanced SpeedStep (deprecated)" 162 select CPU_FREQ_TABLE 163 select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32 164 depends on X86_32 || (X86_64 && ACPI_PROCESSOR) 165 help 166 This is deprecated and this functionality is now merged into 167 acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of 168 speedstep_centrino. 169 This adds the CPUFreq driver for Enhanced SpeedStep enabled 170 mobile CPUs. This means Intel Pentium M (Centrino) CPUs 171 or 64bit enabled Intel Xeons. 172 173 To compile this driver as a module, choose M here: the 174 module will be called speedstep-centrino. 175 176 For details, take a look at <file:Documentation/cpu-freq/>. 177 178 If in doubt, say N. 179 180config X86_SPEEDSTEP_CENTRINO_TABLE 181 bool "Built-in tables for Banias CPUs" 182 depends on X86_32 && X86_SPEEDSTEP_CENTRINO 183 default y 184 help 185 Use built-in tables for Banias CPUs if ACPI encoding 186 is not available. 187 188 If in doubt, say N. 189 190config X86_SPEEDSTEP_ICH 191 tristate "Intel Speedstep on ICH-M chipsets (ioport interface)" 192 select CPU_FREQ_TABLE 193 depends on X86_32 194 help 195 This adds the CPUFreq driver for certain mobile Intel Pentium III 196 (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all 197 mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2, 198 ICH3 or ICH4 southbridge. 199 200 For details, take a look at <file:Documentation/cpu-freq/>. 201 202 If in doubt, say N. 203 204config X86_SPEEDSTEP_SMI 205 tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)" 206 select CPU_FREQ_TABLE 207 depends on X86_32 208 help 209 This adds the CPUFreq driver for certain mobile Intel Pentium III 210 (Coppermine), all mobile Intel Pentium III-M (Tualatin) 211 on systems which have an Intel 440BX/ZX/MX southbridge. 212 213 For details, take a look at <file:Documentation/cpu-freq/>. 214 215 If in doubt, say N. 216 217config X86_P4_CLOCKMOD 218 tristate "Intel Pentium 4 clock modulation" 219 select CPU_FREQ_TABLE 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 select CPU_FREQ_TABLE 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 select CPU_FREQ_TABLE 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