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authorThomas Gleixner <tglx@linutronix.de>2007-03-23 11:08:01 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-03-23 13:21:02 -0400
commite585bef815c0315f2730d7bb4e15b82602454efd (patch)
tree914d777ba187e656a89075398f81e485885f0aab /drivers/acpi
parent296d93cd0205433489b0689533426ce0a8cf2dec (diff)
[PATCH] i386: add command line option "local_apic_timer_c2_ok"
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 <tglx@linutronix.de> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/processor_idle.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 60773005b8af..cdf78943af4d 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -268,6 +268,7 @@ static void acpi_timer_check_state(int state, struct acpi_processor *pr,
268 struct acpi_processor_cx *cx) 268 struct acpi_processor_cx *cx)
269{ 269{
270 struct acpi_processor_power *pwr = &pr->power; 270 struct acpi_processor_power *pwr = &pr->power;
271 u8 type = local_apic_timer_c2_ok ? ACPI_STATE_C3 : ACPI_STATE_C2;
271 272
272 /* 273 /*
273 * Check, if one of the previous states already marked the lapic 274 * 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,
276 if (pwr->timer_broadcast_on_state < state) 277 if (pwr->timer_broadcast_on_state < state)
277 return; 278 return;
278 279
279 if (cx->type >= ACPI_STATE_C2) 280 if (cx->type >= type)
280 pr->power.timer_broadcast_on_state = state; 281 pr->power.timer_broadcast_on_state = state;
281} 282}
282 283