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authorAndi Kleen <ak@suse.de>2006-02-03 21:51:41 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-04 16:43:15 -0800
commit0c3749c41f5eee0da36bbf92b2793338b4d8574f (patch)
tree3af004c5533ab04297004f5ec40da4c6801b8fda /include/asm-x86_64
parent099f318b8d97490e58c595eb1b6d3415da5ccc03 (diff)
[PATCH] x86_64: Calibrate APIC timer using PM timer
On some broken motherboards (at least one NForce3 based AMD64 laptop) the PIT timer runs at a incorrect frequency. This patch adds a new option "apicpmtimer" that allows to use the APIC timer and calibrate it using the PMTimer. It requires the earlier patch that allows to run the main timer from the APIC. Specifying apicpmtimer implies apicmaintimer. The option defaults to off for now. I tested it on a few systems and the resulting APIC timer frequencies were usually a bit off, but always <1%, which should be tolerable. TBD figure out heuristic to enable this automatically on the affected systems TBD perhaps do it on all NForce3s or using DMI? Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-x86_64')
-rw-r--r--include/asm-x86_64/proto.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-x86_64/proto.h b/include/asm-x86_64/proto.h
index a6748b9568f..c99832e7bf3 100644
--- a/include/asm-x86_64/proto.h
+++ b/include/asm-x86_64/proto.h
@@ -42,6 +42,7 @@ extern void iommu_hole_init(void);
extern void time_init_gtod(void);
extern int pmtimer_mark_offset(void);
extern void pmtimer_resume(void);
+extern void pmtimer_wait(unsigned);
extern unsigned int do_gettimeoffset_pm(void);
#ifdef CONFIG_X86_PM_TIMER
extern u32 pmtmr_ioport;