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authorJordan Hargrave <jordan_hargrave@dell.com>2006-04-07 19:50:18 +0200
committerLinus Torvalds <torvalds@g5.osdl.org>2006-04-09 11:53:53 -0700
commitb20367a6c2a0cd937cb1f0a8cf848f1402fef99c (patch)
tree8624096baed40f8f89e757b2d170a7b4d1844575 /include/asm-x86_64/hpet.h
parent49c93e84d8b2d602a07c302c7e3cd4fa09095fbb (diff)
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[PATCH] x86_64: Fix drift with HPET timer enabled
If the HPET timer is enabled, the clock can drift by ~3 seconds a day. This is due to the HPET timer not being initialized with the correct setting (still using PIT count). If HZ changes, this drift can become even more pronounced. HPET patch initializes tick_nsec with correct tick_nsec settings for HPET timer. Vojtech comments: "It's not entirely correct (it assumes the HPET ticks totally exactly), but it's significantly better than assuming the PIT error there." Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-x86_64/hpet.h')
-rw-r--r--include/asm-x86_64/hpet.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/asm-x86_64/hpet.h b/include/asm-x86_64/hpet.h
index 08b75c1..18ff7ee 100644
--- a/include/asm-x86_64/hpet.h
+++ b/include/asm-x86_64/hpet.h
@@ -51,6 +51,8 @@
#define HPET_TN_ROUTE_SHIFT 9
+#define HPET_TICK_RATE (HZ * 100000UL)
+
extern int is_hpet_enabled(void);
extern int hpet_rtc_timer_init(void);
extern int oem_force_hpet_timer(void);