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Commit 56c213fa authored by Zhang Rui's avatar Zhang Rui Committed by Len Brown
Browse files

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: default avatarZhang Rui <rui.zhang@intel.com>
Tested-by: default avatarJames Ettle <theholyettlz@googlemail.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 091bf762

drivers/acpi/processor_throttling.c

+17 −0
Original line number Original line Diff line number Diff line
@@ -45,6 +45,14 @@ 
#define _COMPONENT              ACPI_PROCESSOR_COMPONENT

#define _COMPONENT              ACPI_PROCESSOR_COMPONENT

ACPI_MODULE_NAME("processor_throttling");

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 {

struct throttling_tstate {

	unsigned int cpu;		/* cpu nr */

	unsigned int cpu;		/* cpu nr */

	int target_state;		/* target T-state */

	int target_state;		/* target T-state */
@@ -283,6 +291,10 @@ static int acpi_processor_get_platform_limit(struct acpi_processor *pr) 




	if (!pr)

	if (!pr)

		return -EINVAL;

		return -EINVAL;



	if (ignore_tpc)

		goto end;



	status = acpi_evaluate_integer(pr->handle, "_TPC", NULL, &tpc);

	status = acpi_evaluate_integer(pr->handle, "_TPC", NULL, &tpc);

	if (ACPI_FAILURE(status)) {

	if (ACPI_FAILURE(status)) {

		if (status != AE_NOT_FOUND) {

		if (status != AE_NOT_FOUND) {
@@ -290,6 +302,8 @@ static int acpi_processor_get_platform_limit(struct acpi_processor *pr) 
		}

		}

		return -ENODEV;

		return -ENODEV;

	}

	}



end:

	pr->throttling_platform_limit = (int)tpc;

	pr->throttling_platform_limit = (int)tpc;

	return 0;

	return 0;

}

}
@@ -302,6 +316,9 @@ int acpi_processor_tstate_has_changed(struct acpi_processor *pr) 
	struct acpi_processor_limit *limit;

	struct acpi_processor_limit *limit;

	int target_state;

	int target_state;





	if (ignore_tpc)

		return 0;



	result = acpi_processor_get_platform_limit(pr);

	result = acpi_processor_get_platform_limit(pr);

	if (result) {

	if (result) {

		/* Throttling Limit is unsupported */

		/* Throttling Limit is unsupported */