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| author | Venki Pallipadi <venkatesh.pallipadi@intel.com> | 2007-10-12 23:04:23 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@inhelltoy.tec.linutronix.de> | 2007-10-12 23:04:23 +0200 |
| commit | d54bd57d6580250e6551261f3b15c45a9d90c77b (patch) | |
| tree | 12cb06b4adb9494e67cefdc691643e333fef3b91 /include/asm-x86 | |
| parent | 610bf2f143b9c5cda768a2d428d66d3a16769930 (diff) | |
| download | linux-d54bd57d6580250e6551261f3b15c45a9d90c77b.tar.gz linux-d54bd57d6580250e6551261f3b15c45a9d90c77b.tar.bz2 linux-d54bd57d6580250e6551261f3b15c45a9d90c77b.zip | |
x86: HPET force enable o ICH7 and later
Force detect and/or enable HPET on ICH chipsets. This patch just handles the
detection part and following patches use this information. Adds a function to
repeat the force enabling during resume time.
Using HPET this way, instead of PIT increases the time CPUs can reside in
C-state when system is totally idle. On my test system with Core 2 Duo,
average C-state residency goes up from ~20mS to ~80mS.
[ Build fixed from Andrew Morton ]
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Cc: Andi Kleen <ak@suse.de>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/asm-x86')
| -rw-r--r-- | include/asm-x86/hpet.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-x86/hpet.h b/include/asm-x86/hpet.h index 64446a9577dc..7c933242365f 100644 --- a/include/asm-x86/hpet.h +++ b/include/asm-x86/hpet.h @@ -66,6 +66,7 @@ extern unsigned long hpet_address; extern int is_hpet_enabled(void); extern int hpet_enable(void); extern unsigned long hpet_readl(unsigned long a); +extern void ich_force_hpet_resume(void); #ifdef CONFIG_HPET_EMULATE_RTC |