diff options
Diffstat (limited to 'drivers/acpi/processor_perflib.c')
| -rw-r--r-- | drivers/acpi/processor_perflib.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c index b4749969c6b..e98071a6481 100644 --- a/drivers/acpi/processor_perflib.c +++ b/drivers/acpi/processor_perflib.c @@ -64,7 +64,13 @@ static DEFINE_MUTEX(performance_mutex); * policy is adjusted accordingly. */ -static unsigned int ignore_ppc = 0; +/* ignore_ppc: + * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet + * ignore _PPC + * 0 -> cpufreq low level drivers initialized -> consider _PPC values + * 1 -> ignore _PPC totally -> forced by user through boot param + */ +static unsigned int ignore_ppc = -1; module_param(ignore_ppc, uint, 0644); MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \ "limited by BIOS, this should help"); @@ -72,7 +78,7 @@ MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \ #define PPC_REGISTERED 1 #define PPC_IN_USE 2 -static int acpi_processor_ppc_status = 0; +static int acpi_processor_ppc_status; static int acpi_processor_ppc_notifier(struct notifier_block *nb, unsigned long event, void *data) @@ -81,6 +87,11 @@ static int acpi_processor_ppc_notifier(struct notifier_block *nb, struct acpi_processor *pr; unsigned int ppc = 0; + if (event == CPUFREQ_START && ignore_ppc <= 0) { + ignore_ppc = 0; + return 0; + } + if (ignore_ppc) return 0; |