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 select CPU_FREQ_TABLE 136 help 137 This adds AMD-specific powersave bias function to the ondemand 138 governor, which allows it to make more power-conscious frequency 139 change decisions based on feedback from hardware (availble on AMD 140 Family 16h and above). 141 142 Hardware feedback tells software how "sensitive" to frequency changes 143 the CPUs' workloads are. CPU-bound workloads will be more sensitive 144 -- they will perform better as frequency increases. Memory/IO-bound 145 workloads will be less sensitive -- they will not necessarily perform 146 better as frequency increases. 147 148 If in doubt, say N. 149 150config X86_GX_SUSPMOD 151 tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation" 152 depends on X86_32 && PCI 153 help 154 This add the CPUFreq driver for NatSemi Geode processors which 155 support suspend modulation. 156 157 For details, take a look at <file:Documentation/cpu-freq/>. 158 159 If in doubt, say N. 160 161config X86_SPEEDSTEP_CENTRINO 162 tristate "Intel Enhanced SpeedStep (deprecated)" 163 select CPU_FREQ_TABLE 164 select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32 165 depends on X86_32 || (X86_64 && ACPI_PROCESSOR) 166 help 167 This is deprecated and this functionality is now merged into 168 acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of 169 speedstep_centrino. 170 This adds the CPUFreq driver for Enhanced SpeedStep enabled 171 mobile CPUs. This means Intel Pentium M (Centrino) CPUs 172 or 64bit enabled Intel Xeons. 173 174 To compile this driver as a module, choose M here: the 175 module will be called speedstep-centrino. 176 177 For details, take a look at <file:Documentation/cpu-freq/>. 178 179 If in doubt, say N. 180 181config X86_SPEEDSTEP_CENTRINO_TABLE 182 bool "Built-in tables for Banias CPUs" 183 depends on X86_32 && X86_SPEEDSTEP_CENTRINO 184 default y 185 help 186 Use built-in tables for Banias CPUs if ACPI encoding 187 is not available. 188 189 If in doubt, say N. 190 191config X86_SPEEDSTEP_ICH 192 tristate "Intel Speedstep on ICH-M chipsets (ioport interface)" 193 select CPU_FREQ_TABLE 194 depends on X86_32 195 help 196 This adds the CPUFreq driver for certain mobile Intel Pentium III 197 (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all 198 mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2, 199 ICH3 or ICH4 southbridge. 200 201 For details, take a look at <file:Documentation/cpu-freq/>. 202 203 If in doubt, say N. 204 205config X86_SPEEDSTEP_SMI 206 tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)" 207 select CPU_FREQ_TABLE 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 select CPU_FREQ_TABLE 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 select CPU_FREQ_TABLE 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 select CPU_FREQ_TABLE 276 depends on X86_32 && ACPI_PROCESSOR 277 help 278 This adds the CPUFreq driver for VIA C7 processors. However, this driver 279 does not have any safeguards to prevent operating the CPU out of spec 280 and is thus considered dangerous. Please use the regular ACPI cpufreq 281 driver, enabled by CONFIG_X86_ACPI_CPUFREQ. 282 283 If in doubt, say N. 284 285comment "shared options" 286 287config X86_SPEEDSTEP_LIB 288 tristate 289 default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD) 290 291config X86_SPEEDSTEP_RELAXED_CAP_CHECK 292 bool "Relaxed speedstep capability checks" 293 depends on X86_32 && (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH) 294 help 295 Don't perform all checks for a speedstep capable system which would 296 normally be done. Some ancient or strange systems, though speedstep 297 capable, don't always indicate that they are speedstep capable. This 298 option lets the probing code bypass some of those checks if the 299 parameter "relaxed_check=1" is passed to the module. 300 301