1# 2# x86 CPU Frequency scaling drivers 3# 4 5config X86_PCC_CPUFREQ 6 tristate "Processor Clocking Control interface driver" 7 depends on ACPI && ACPI_PROCESSOR 8 help 9 This driver adds support for the PCC interface. 10 11 For details, take a look at: 12 <file:Documentation/cpu-freq/pcc-cpufreq.txt>. 13 14 To compile this driver as a module, choose M here: the 15 module will be called pcc-cpufreq. 16 17 If in doubt, say N. 18 19config X86_ACPI_CPUFREQ 20 tristate "ACPI Processor P-States driver" 21 select CPU_FREQ_TABLE 22 depends on ACPI_PROCESSOR 23 help 24 This driver adds a CPUFreq driver which utilizes the ACPI 25 Processor Performance States. 26 This driver also supports Intel Enhanced Speedstep. 27 28 To compile this driver as a module, choose M here: the 29 module will be called acpi-cpufreq. 30 31 For details, take a look at <file:Documentation/cpu-freq/>. 32 33 If in doubt, say N. 34 35config ELAN_CPUFREQ 36 tristate "AMD Elan SC400 and SC410" 37 select CPU_FREQ_TABLE 38 depends on MELAN 39 ---help--- 40 This adds the CPUFreq driver for AMD Elan SC400 and SC410 41 processors. 42 43 You need to specify the processor maximum speed as boot 44 parameter: elanfreq=maxspeed (in kHz) or as module 45 parameter "max_freq". 46 47 For details, take a look at <file:Documentation/cpu-freq/>. 48 49 If in doubt, say N. 50 51config SC520_CPUFREQ 52 tristate "AMD Elan SC520" 53 select CPU_FREQ_TABLE 54 depends on MELAN 55 ---help--- 56 This adds the CPUFreq driver for AMD Elan SC520 processor. 57 58 For details, take a look at <file:Documentation/cpu-freq/>. 59 60 If in doubt, say N. 61 62 63config X86_POWERNOW_K6 64 tristate "AMD Mobile K6-2/K6-3 PowerNow!" 65 select CPU_FREQ_TABLE 66 depends on X86_32 67 help 68 This adds the CPUFreq driver for mobile AMD K6-2+ and mobile 69 AMD K6-3+ processors. 70 71 For details, take a look at <file:Documentation/cpu-freq/>. 72 73 If in doubt, say N. 74 75config X86_POWERNOW_K7 76 tristate "AMD Mobile Athlon/Duron PowerNow!" 77 select CPU_FREQ_TABLE 78 depends on X86_32 79 help 80 This adds the CPUFreq driver for mobile AMD K7 mobile processors. 81 82 For details, take a look at <file:Documentation/cpu-freq/>. 83 84 If in doubt, say N. 85 86config X86_POWERNOW_K7_ACPI 87 bool 88 depends on X86_POWERNOW_K7 && ACPI_PROCESSOR 89 depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m) 90 depends on X86_32 91 default y 92 93config X86_POWERNOW_K8 94 tristate "AMD Opteron/Athlon64 PowerNow!" 95 select CPU_FREQ_TABLE 96 depends on ACPI && ACPI_PROCESSOR 97 help 98 This adds the CPUFreq driver for K8/K10 Opteron/Athlon64 processors. 99 100 To compile this driver as a module, choose M here: the 101 module will be called powernow-k8. 102 103 For details, take a look at <file:Documentation/cpu-freq/>. 104 105config X86_GX_SUSPMOD 106 tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation" 107 depends on X86_32 && PCI 108 help 109 This add the CPUFreq driver for NatSemi Geode processors which 110 support suspend modulation. 111 112 For details, take a look at <file:Documentation/cpu-freq/>. 113 114 If in doubt, say N. 115 116config X86_SPEEDSTEP_CENTRINO 117 tristate "Intel Enhanced SpeedStep (deprecated)" 118 select CPU_FREQ_TABLE 119 select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32 120 depends on X86_32 || (X86_64 && ACPI_PROCESSOR) 121 help 122 This is deprecated and this functionality is now merged into 123 acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of 124 speedstep_centrino. 125 This adds the CPUFreq driver for Enhanced SpeedStep enabled 126 mobile CPUs. This means Intel Pentium M (Centrino) CPUs 127 or 64bit enabled Intel Xeons. 128 129 To compile this driver as a module, choose M here: the 130 module will be called speedstep-centrino. 131 132 For details, take a look at <file:Documentation/cpu-freq/>. 133 134 If in doubt, say N. 135 136config X86_SPEEDSTEP_CENTRINO_TABLE 137 bool "Built-in tables for Banias CPUs" 138 depends on X86_32 && X86_SPEEDSTEP_CENTRINO 139 default y 140 help 141 Use built-in tables for Banias CPUs if ACPI encoding 142 is not available. 143 144 If in doubt, say N. 145 146config X86_SPEEDSTEP_ICH 147 tristate "Intel Speedstep on ICH-M chipsets (ioport interface)" 148 select CPU_FREQ_TABLE 149 depends on X86_32 150 help 151 This adds the CPUFreq driver for certain mobile Intel Pentium III 152 (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all 153 mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2, 154 ICH3 or ICH4 southbridge. 155 156 For details, take a look at <file:Documentation/cpu-freq/>. 157 158 If in doubt, say N. 159 160config X86_SPEEDSTEP_SMI 161 tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)" 162 select CPU_FREQ_TABLE 163 depends on X86_32 && EXPERIMENTAL 164 help 165 This adds the CPUFreq driver for certain mobile Intel Pentium III 166 (Coppermine), all mobile Intel Pentium III-M (Tualatin) 167 on systems which have an Intel 440BX/ZX/MX southbridge. 168 169 For details, take a look at <file:Documentation/cpu-freq/>. 170 171 If in doubt, say N. 172 173config X86_P4_CLOCKMOD 174 tristate "Intel Pentium 4 clock modulation" 175 select CPU_FREQ_TABLE 176 help 177 This adds the CPUFreq driver for Intel Pentium 4 / XEON 178 processors. When enabled it will lower CPU temperature by skipping 179 clocks. 180 181 This driver should be only used in exceptional 182 circumstances when very low power is needed because it causes severe 183 slowdowns and noticeable latencies. Normally Speedstep should be used 184 instead. 185 186 To compile this driver as a module, choose M here: the 187 module will be called p4-clockmod. 188 189 For details, take a look at <file:Documentation/cpu-freq/>. 190 191 Unless you are absolutely sure say N. 192 193config X86_CPUFREQ_NFORCE2 194 tristate "nVidia nForce2 FSB changing" 195 depends on X86_32 && EXPERIMENTAL 196 help 197 This adds the CPUFreq driver for FSB changing on nVidia nForce2 198 platforms. 199 200 For details, take a look at <file:Documentation/cpu-freq/>. 201 202 If in doubt, say N. 203 204config X86_LONGRUN 205 tristate "Transmeta LongRun" 206 depends on X86_32 207 help 208 This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors 209 which support LongRun. 210 211 For details, take a look at <file:Documentation/cpu-freq/>. 212 213 If in doubt, say N. 214 215config X86_LONGHAUL 216 tristate "VIA Cyrix III Longhaul" 217 select CPU_FREQ_TABLE 218 depends on X86_32 && ACPI_PROCESSOR 219 help 220 This adds the CPUFreq driver for VIA Samuel/CyrixIII, 221 VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T 222 processors. 223 224 For details, take a look at <file:Documentation/cpu-freq/>. 225 226 If in doubt, say N. 227 228config X86_E_POWERSAVER 229 tristate "VIA C7 Enhanced PowerSaver (DANGEROUS)" 230 select CPU_FREQ_TABLE 231 depends on X86_32 && EXPERIMENTAL 232 help 233 This adds the CPUFreq driver for VIA C7 processors. However, this driver 234 does not have any safeguards to prevent operating the CPU out of spec 235 and is thus considered dangerous. Please use the regular ACPI cpufreq 236 driver, enabled by CONFIG_X86_ACPI_CPUFREQ. 237 238 If in doubt, say N. 239 240comment "shared options" 241 242config X86_SPEEDSTEP_LIB 243 tristate 244 default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD) 245 246config X86_SPEEDSTEP_RELAXED_CAP_CHECK 247 bool "Relaxed speedstep capability checks" 248 depends on X86_32 && (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH) 249 help 250 Don't perform all checks for a speedstep capable system which would 251 normally be done. Some ancient or strange systems, though speedstep 252 capable, don't always indicate that they are speedstep capable. This 253 option lets the probing code bypass some of those checks if the 254 parameter "relaxed_check=1" is passed to the module. 255 256