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_GX_SUSPMOD 133 tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation" 134 depends on X86_32 && PCI 135 help 136 This add the CPUFreq driver for NatSemi Geode processors which 137 support suspend modulation. 138 139 For details, take a look at <file:Documentation/cpu-freq/>. 140 141 If in doubt, say N. 142 143config X86_SPEEDSTEP_CENTRINO 144 tristate "Intel Enhanced SpeedStep (deprecated)" 145 select CPU_FREQ_TABLE 146 select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32 147 depends on X86_32 || (X86_64 && ACPI_PROCESSOR) 148 help 149 This is deprecated and this functionality is now merged into 150 acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of 151 speedstep_centrino. 152 This adds the CPUFreq driver for Enhanced SpeedStep enabled 153 mobile CPUs. This means Intel Pentium M (Centrino) CPUs 154 or 64bit enabled Intel Xeons. 155 156 To compile this driver as a module, choose M here: the 157 module will be called speedstep-centrino. 158 159 For details, take a look at <file:Documentation/cpu-freq/>. 160 161 If in doubt, say N. 162 163config X86_SPEEDSTEP_CENTRINO_TABLE 164 bool "Built-in tables for Banias CPUs" 165 depends on X86_32 && X86_SPEEDSTEP_CENTRINO 166 default y 167 help 168 Use built-in tables for Banias CPUs if ACPI encoding 169 is not available. 170 171 If in doubt, say N. 172 173config X86_SPEEDSTEP_ICH 174 tristate "Intel Speedstep on ICH-M chipsets (ioport interface)" 175 select CPU_FREQ_TABLE 176 depends on X86_32 177 help 178 This adds the CPUFreq driver for certain mobile Intel Pentium III 179 (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all 180 mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2, 181 ICH3 or ICH4 southbridge. 182 183 For details, take a look at <file:Documentation/cpu-freq/>. 184 185 If in doubt, say N. 186 187config X86_SPEEDSTEP_SMI 188 tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)" 189 select CPU_FREQ_TABLE 190 depends on X86_32 191 help 192 This adds the CPUFreq driver for certain mobile Intel Pentium III 193 (Coppermine), all mobile Intel Pentium III-M (Tualatin) 194 on systems which have an Intel 440BX/ZX/MX southbridge. 195 196 For details, take a look at <file:Documentation/cpu-freq/>. 197 198 If in doubt, say N. 199 200config X86_P4_CLOCKMOD 201 tristate "Intel Pentium 4 clock modulation" 202 select CPU_FREQ_TABLE 203 help 204 This adds the CPUFreq driver for Intel Pentium 4 / XEON 205 processors. When enabled it will lower CPU temperature by skipping 206 clocks. 207 208 This driver should be only used in exceptional 209 circumstances when very low power is needed because it causes severe 210 slowdowns and noticeable latencies. Normally Speedstep should be used 211 instead. 212 213 To compile this driver as a module, choose M here: the 214 module will be called p4-clockmod. 215 216 For details, take a look at <file:Documentation/cpu-freq/>. 217 218 Unless you are absolutely sure say N. 219 220config X86_CPUFREQ_NFORCE2 221 tristate "nVidia nForce2 FSB changing" 222 depends on X86_32 223 help 224 This adds the CPUFreq driver for FSB changing on nVidia nForce2 225 platforms. 226 227 For details, take a look at <file:Documentation/cpu-freq/>. 228 229 If in doubt, say N. 230 231config X86_LONGRUN 232 tristate "Transmeta LongRun" 233 depends on X86_32 234 help 235 This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors 236 which support LongRun. 237 238 For details, take a look at <file:Documentation/cpu-freq/>. 239 240 If in doubt, say N. 241 242config X86_LONGHAUL 243 tristate "VIA Cyrix III Longhaul" 244 select CPU_FREQ_TABLE 245 depends on X86_32 && ACPI_PROCESSOR 246 help 247 This adds the CPUFreq driver for VIA Samuel/CyrixIII, 248 VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T 249 processors. 250 251 For details, take a look at <file:Documentation/cpu-freq/>. 252 253 If in doubt, say N. 254 255config X86_E_POWERSAVER 256 tristate "VIA C7 Enhanced PowerSaver (DANGEROUS)" 257 select CPU_FREQ_TABLE 258 depends on X86_32 259 help 260 This adds the CPUFreq driver for VIA C7 processors. However, this driver 261 does not have any safeguards to prevent operating the CPU out of spec 262 and is thus considered dangerous. Please use the regular ACPI cpufreq 263 driver, enabled by CONFIG_X86_ACPI_CPUFREQ. 264 265 If in doubt, say N. 266 267comment "shared options" 268 269config X86_SPEEDSTEP_LIB 270 tristate 271 default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD) 272 273config X86_SPEEDSTEP_RELAXED_CAP_CHECK 274 bool "Relaxed speedstep capability checks" 275 depends on X86_32 && (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH) 276 help 277 Don't perform all checks for a speedstep capable system which would 278 normally be done. Some ancient or strange systems, though speedstep 279 capable, don't always indicate that they are speedstep capable. This 280 option lets the probing code bypass some of those checks if the 281 parameter "relaxed_check=1" is passed to the module. 282 283