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| author | Andre Przywara <andre.przywara@amd.com> | 2012-09-04 08:28:08 +0000 |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2012-09-09 22:05:20 +0200 |
| commit | 11269ff506888a06b19c8c7a3297114f30673973 (patch) | |
| tree | 3c70a6218d00ae748b315efaa1c8619a306470fb /drivers/cpufreq/Kconfig.x86 | |
| parent | 615b7300717b9ad5c23d1f391843484fe30f6c12 (diff) | |
| download | linux-11269ff506888a06b19c8c7a3297114f30673973.tar.bz2 | |
acpi-cpufreq: Add compatibility for legacy AMD cpb sysfs knob
The powernow-k8 driver supported a sysfs knob called "cpb", which was
instantiated per CPU, but actually acted globally for the whole
system. To keep some compatibility with this feature, we re-introduce
this behavior here, but:
a) only enable it on AMD CPUs and
b) protect it with a Kconfig switch
I'd like to consider this feature obsolete. Lets keep it around for
some kernel versions and then phase it out.
Signed-off-by: Andre Przywara <andre.przywara@amd.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'drivers/cpufreq/Kconfig.x86')
| -rw-r--r-- | drivers/cpufreq/Kconfig.x86 | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/cpufreq/Kconfig.x86 b/drivers/cpufreq/Kconfig.x86 index b36ca1f68bff..934854ae5eb4 100644 --- a/drivers/cpufreq/Kconfig.x86 +++ b/drivers/cpufreq/Kconfig.x86 @@ -33,6 +33,18 @@ config X86_ACPI_CPUFREQ If in doubt, say N. +config X86_ACPI_CPUFREQ_CPB + default y + bool "Legacy cpb sysfs knob support for AMD CPUs" + depends on X86_ACPI_CPUFREQ && CPU_SUP_AMD + help + The powernow-k8 driver used to provide a sysfs knob called "cpb" + to disable the Core Performance Boosting feature of AMD CPUs. This + file has now been superseeded by the more generic "boost" entry. + + By enabling this option the acpi_cpufreq driver provides the old + entry in addition to the new boost ones, for compatibility reasons. + config ELAN_CPUFREQ tristate "AMD Elan SC400 and SC410" select CPU_FREQ_TABLE |