redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

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: Dmitry Lyzhyn <thisistempbox@yahoo.com>
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
hifive-unleashed-5.1
Shaohua Li 2009-05-19 16:09:42 +08:00 committed by Len Brown
parent cd86a536c8
commit 87ad57bacb
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/acpi/processor_idle.c
View File

@ -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;
}