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Commit 623b78c3 authored by Thomas Renninger's avatar Thomas Renninger Committed by Len Brown
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ACPI: add "processor.ignore_ppc" hook to workaround BIOS _PPC weirdness 



There have been fixes using _PPC, which seem to unhide a problem
on HP nx6125 (double cpufreq switch freezes the machine for
several seconds).

This one should provide a workaround for the nx6125 and for
possible other machines that show any weird _PPC behaviour.

Signed-off-by: default avatarThomas Renninger <trenn@suse.de>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent e697789d

drivers/acpi/processor_perflib.c

+15 −1
Original line number Diff line number Diff line
@@ -60,6 +60,11 @@ static DEFINE_MUTEX(performance_mutex); 
 * policy is adjusted accordingly.

 */



static unsigned int ignore_ppc = 0;

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");



#define PPC_REGISTERED   1

#define PPC_IN_USE       2
@@ -72,6 +77,9 @@ static int acpi_processor_ppc_notifier(struct notifier_block *nb, 
	struct acpi_processor *pr;

	unsigned int ppc = 0;



	if (ignore_ppc)

		return 0;



	mutex_lock(&performance_mutex);



	if (event != CPUFREQ_INCOMPATIBLE)
@@ -130,7 +138,13 @@ static int acpi_processor_get_platform_limit(struct acpi_processor *pr) 


int acpi_processor_ppc_has_changed(struct acpi_processor *pr)

{

	int ret = acpi_processor_get_platform_limit(pr);

	int ret;



	if (ignore_ppc)

		return 0;



	ret = acpi_processor_get_platform_limit(pr);



	if (ret < 0)

		return (ret);

	else