Introduce module parameter processor.ignore_tpc. Some laptops are shipped with buggy _TPC implemented, this module parameter is used to workaround this kind of issues. http://bugzilla.kernel.org/show_bug.cgi?id=13259 Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx> Tested-by: James Ettle <theholyettlz@xxxxxxxxxxxxxx> --- drivers/acpi/processor_throttling.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) Index: linux-2.6/drivers/acpi/processor_throttling.c =================================================================== --- linux-2.6.orig/drivers/acpi/processor_throttling.c +++ linux-2.6/drivers/acpi/processor_throttling.c @@ -45,6 +45,16 @@ #define _COMPONENT ACPI_PROCESSOR_COMPONENT ACPI_MODULE_NAME("processor_throttling"); +/* ignore_tpc: + * 0 -> acpi processor driver doesn't ignore _TPC values + * 1 -> acpi processor driver ignores _TPC values + */ +static int ignore_tpc; +module_param(ignore_tpc, int, 0644); +MODULE_PARM_DESC(ignore_tpc, "If the processor throttling state of your machine gets wrongly" \ + "limited by BIOS, this should help"); + + struct throttling_tstate { unsigned int cpu; /* cpu nr */ int target_state; /* target T-state */ @@ -283,6 +293,10 @@ static int acpi_processor_get_platform_l if (!pr) return -EINVAL; + + if (ignore_tpc) + goto end; + status = acpi_evaluate_integer(pr->handle, "_TPC", NULL, &tpc); if (ACPI_FAILURE(status)) { if (status != AE_NOT_FOUND) { @@ -290,6 +304,8 @@ static int acpi_processor_get_platform_l } return -ENODEV; } + +end: pr->throttling_platform_limit = (int)tpc; return 0; } @@ -302,6 +318,9 @@ int acpi_processor_tstate_has_changed(st struct acpi_processor_limit *limit; int target_state; + if (ignore_tpc) + return 0; + result = acpi_processor_get_platform_limit(pr); if (result) { /* Throttling Limit is unsupported */ -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
