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Commit 87ad57ba authored by Shaohua Li's avatar Shaohua Li Committed by Len Brown
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cpuidle: makes AMD C1E work in acpi_idle 

When AMD C1E is enabled, local APIC timer will stop even in C1.
This patch uses broadcast IPI to replace local APIC timer in C1.

http://bugzilla.kernel.org/show_bug.cgi?id=13233



[ impact: avoid boot hang in AMD CPU with C1E enabled ]

Tested-by: default avatarDmitry Lyzhyn <thisistempbox@yahoo.com>
Signed-off-by: default avatarShaohua Li <shaohua.li@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent cd86a536

drivers/acpi/processor_idle.c

+6 −0
Original line number Diff line number Diff line
@@ -148,6 +148,9 @@ static void acpi_timer_check_state(int state, struct acpi_processor *pr, 
	if (cpu_has(&cpu_data(pr->id), X86_FEATURE_ARAT))

		return;



	if (boot_cpu_has(X86_FEATURE_AMDC1E))

		type = ACPI_STATE_C1;



	/*

	 * Check, if one of the previous states already marked the lapic

	 * unstable
@@ -611,6 +614,7 @@ static int acpi_processor_power_verify(struct acpi_processor *pr) 
		switch (cx->type) {

		case ACPI_STATE_C1:

			cx->valid = 1;

			acpi_timer_check_state(i, pr, cx);

			break;



		case ACPI_STATE_C2:
@@ -835,6 +839,7 @@ static int acpi_idle_enter_c1(struct cpuidle_device *dev, 
		return 0;

	}



	acpi_state_timer_broadcast(pr, cx, 1);

	kt1 = ktime_get_real();

	acpi_idle_do_entry(cx);

	kt2 = ktime_get_real();
@@ -842,6 +847,7 @@ static int acpi_idle_enter_c1(struct cpuidle_device *dev, 


	local_irq_enable();

	cx->usage++;

	acpi_state_timer_broadcast(pr, cx, 0);



	return idle_time;

}