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ACPI processor: introduce module parameter processor.ignore_tpc 

Introduce module parameter processor.ignore_tpc.

Some laptops are shipped with buggy _TPC,
this module parameter is used to to disable the buggy support.

http://bugzilla.kernel.org/show_bug.cgi?id=13259

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Tested-by: James Ettle <theholyettlz@googlemail.com>
Signed-off-by: Len Brown <len.brown@intel.com>
hifive-unleashed-5.1
Zhang Rui 2009-05-11 09:35:57 +08:00 committed by Len Brown
parent 091bf7624d
commit 56c213fa01
1 changed files with 17 additions and 0 deletions
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17
drivers/acpi/processor_throttling.c
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@ -45,6 +45,14 @@
#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, "Disable broken BIOS _TPC throttling support");
struct throttling_tstate {
unsigned int cpu; /* cpu nr */
int target_state; /* target T-state */
@ -283,6 +291,10 @@ static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
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 +302,8 @@ static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
}
return -ENODEV;
}
end:
pr->throttling_platform_limit = (int)tpc;
return 0;
}
@ -302,6 +316,9 @@ int acpi_processor_tstate_has_changed(struct acpi_processor *pr)
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 */