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authorThomas Gleixner <tglx@linutronix.de>2008-09-03 21:37:24 +0000
committerThomas Gleixner <tglx@linutronix.de>2008-09-05 11:11:54 +0200
commit7cfb0435330364f90f274a26ecdc5f47f738498c (patch)
tree97c8732a64487e1d8c32cb412254944da53c4a36
parent1fb9b7d29d8e85ba3196eaa7ab871bf76fc98d36 (diff)
HPET: make minimum reprogramming delta useful
The minimum reprogramming delta was hardcoded in HPET ticks, which is stupid as it does not work with faster running HPETs. The C1E idle patches made this prominent on AMD/RS690 chipsets, where the HPET runs with 25MHz. Set it to 5us which seems to be a reasonable value and fixes the problems on the bug reporters machines. We have a further sanity check now in the clock events, which increases the delta when it is not sufficient. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Luiz Fernando N. Capitulino <lcapitulino@mandriva.com.br> Tested-by: Dmitry Nezhevenko <dion@inhex.net> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--arch/x86/kernel/hpet.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index 59fd3b6b130..2256315416d 100644
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -210,8 +210,8 @@ static void hpet_legacy_clockevent_register(void)
/* Calculate the min / max delta */
hpet_clockevent.max_delta_ns = clockevent_delta2ns(0x7FFFFFFF,
&hpet_clockevent);
- hpet_clockevent.min_delta_ns = clockevent_delta2ns(0x30,
- &hpet_clockevent);
+ /* 5 usec minimum reprogramming delta. */
+ hpet_clockevent.min_delta_ns = 5000;
/*
* Start hpet with the boot cpu mask and make it