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[PATCH] i386: add command line option "local_apic_timer_c2_ok"

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It turned out that it is almost impossible to trust ACPI, BIOS & Co.
regarding the C states. This was the reason to switch the local apic
timer off in C2 state already. OTOH there are sane and well behaving
systems, which get punished by that decision.

Allow the user to confirm that the local apic timer is trustworthy in C2
state. This keeps the default behaviour on the safe side.

Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: Ingo Molnar <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Thomas Gleixner 2007-03-23 16:08:01 +01:00 • committed by Linus Torvalds
commit e585bef815
4 changed files with 16 additions and 1 deletions
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3
drivers/acpi/processor_idle.c
View file

@ -268,6 +268,7 @@ static void acpi_timer_check_state(int state, struct acpi_processor *pr,
struct acpi_processor_cx *cx)
{
struct acpi_processor_power *pwr = &pr->power;
u8 type = local_apic_timer_c2_ok ? ACPI_STATE_C3 : ACPI_STATE_C2;
/*
* Check, if one of the previous states already marked the lapic
@ -276,7 +277,7 @@ static void acpi_timer_check_state(int state, struct acpi_processor *pr,
if (pwr->timer_broadcast_on_state < state)
return;
if (cx->type >= ACPI_STATE_C2)
if (cx->type >= type)
pr->power.timer_broadcast_on_state = state;
}