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authorClemens Ladisch <clemens@ladisch.de>2005-10-30 15:03:36 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-30 17:37:29 -0800
commit5f819949ee4e5a06c2e0054cbb42f3f0d170d779 (patch)
tree85dfb0366a13b3e0ae073b5838ec8d457fd89518
parentf00c96f313b07d2eb2845305b9a3395e14385767 (diff)
[PATCH] hpet-RTC: fix timer config register accesses
Make sure that the RTC timer is in non-periodic mode; some stupid BIOS might have initialized it to periodic mode. Furthermore, don't set the SETVAL bit in the config register. This wouldn't have any effect unless the timer was in period mode (which it isn't), and then the actual timer frequency would be half that of the desired one because incrementing the comparator in the interrupt handler would be done after the hardware has already incremented it itself. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Acked-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--arch/i386/kernel/time_hpet.c9
-rw-r--r--arch/x86_64/kernel/time.c9
2 files changed, 4 insertions, 14 deletions
diff --git a/arch/i386/kernel/time_hpet.c b/arch/i386/kernel/time_hpet.c
index 23e81fcbeaea..cb1f313858e3 100644
--- a/arch/i386/kernel/time_hpet.c
+++ b/arch/i386/kernel/time_hpet.c
@@ -309,7 +309,8 @@ int hpet_rtc_timer_init(void)
local_irq_restore(flags);
cfg = hpet_readl(HPET_T1_CFG);
- cfg |= HPET_TN_ENABLE | HPET_TN_SETVAL | HPET_TN_32BIT;
+ cfg &= ~HPET_TN_PERIODIC;
+ cfg |= HPET_TN_ENABLE | HPET_TN_32BIT;
hpet_writel(cfg, HPET_T1_CFG);
return 1;
@@ -335,12 +336,6 @@ static void hpet_rtc_timer_reinit(void)
cnt = hpet_readl(HPET_T1_CMP);
cnt += hpet_tick*HZ/hpet_rtc_int_freq;
hpet_writel(cnt, HPET_T1_CMP);
-
- cfg = hpet_readl(HPET_T1_CFG);
- cfg |= HPET_TN_ENABLE | HPET_TN_SETVAL | HPET_TN_32BIT;
- hpet_writel(cfg, HPET_T1_CFG);
-
- return;
}
/*
diff --git a/arch/x86_64/kernel/time.c b/arch/x86_64/kernel/time.c
index 7037ca668c63..35a896ef4c35 100644
--- a/arch/x86_64/kernel/time.c
+++ b/arch/x86_64/kernel/time.c
@@ -1128,7 +1128,8 @@ int hpet_rtc_timer_init(void)
local_irq_restore(flags);
cfg = hpet_readl(HPET_T1_CFG);
- cfg |= HPET_TN_ENABLE | HPET_TN_SETVAL | HPET_TN_32BIT;
+ cfg &= ~HPET_TN_PERIODIC;
+ cfg |= HPET_TN_ENABLE | HPET_TN_32BIT;
hpet_writel(cfg, HPET_T1_CFG);
return 1;
@@ -1154,12 +1155,6 @@ static void hpet_rtc_timer_reinit(void)
cnt = hpet_readl(HPET_T1_CMP);
cnt += hpet_tick*HZ/hpet_rtc_int_freq;
hpet_writel(cnt, HPET_T1_CMP);
-
- cfg = hpet_readl(HPET_T1_CFG);
- cfg |= HPET_TN_ENABLE | HPET_TN_SETVAL | HPET_TN_32BIT;
- hpet_writel(cfg, HPET_T1_CFG);
-
- return;
}
/*