HPET: make minimum reprogramming delta useful
authorThomas Gleixner <tglx@linutronix.de>
Wed, 3 Sep 2008 21:37:24 +0000 (21:37 +0000)
committerThomas Gleixner <tglx@linutronix.de>
Fri, 5 Sep 2008 09:11:54 +0000 (11:11 +0200)
commit7cfb0435330364f90f274a26ecdc5f47f738498c
tree97c8732a64487e1d8c32cb412254944da53c4a36
parent1fb9b7d29d8e85ba3196eaa7ab871bf76fc98d36
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>
arch/x86/kernel/hpet.c