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| author | Manuel Lauss <manuel.lauss@googlemail.com> | 2011-12-20 17:37:29 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2012-02-20 18:33:18 +0100 |
| commit | 8e3657903589f5a5a36a95f660a33e137b3da6f5 (patch) | |
| tree | 47f7853d3e662ff6b6e307eedcae48687e374414 /arch/mips/alchemy/common | |
| parent | 193fb42613ec8d96bcb645cf717e949821ff07a7 (diff) | |
| download | blackbird-obmc-linux-8e3657903589f5a5a36a95f660a33e137b3da6f5.tar.gz blackbird-obmc-linux-8e3657903589f5a5a36a95f660a33e137b3da6f5.zip | |
MIPS: Alchemy: Increase minimum timeout for 32kHz timer.
Since a clocksource change post 3.2-rc1, tasks on my DB1500 board
hang after random amounts of time (from a few minutes to a few hours),
regardless of load. Debugging showed that the compare-match register
value is a few seconds lower than the current counter value.
The minimum value of 8 was initialy determined by a trial-and-error
approach. Currently it is sufficient for all Alchemys (without PCI
apparently), independent of CPU clock; only the DB1500 and DB1550
boards experience these timer-related tasks hangs now.
This patch increases the minimum timeout by 1 (to 9 counter ticks)
which seems sufficient since the systems are still working perfectly
fine after over 24 hours.
Signed-off-by: Manuel Lauss <manuel.lauss@googlemail.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3214/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/alchemy/common')
| -rw-r--r-- | arch/mips/alchemy/common/time.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/mips/alchemy/common/time.c b/arch/mips/alchemy/common/time.c index 7da4d0081487..a7193ae13a5d 100644 --- a/arch/mips/alchemy/common/time.c +++ b/arch/mips/alchemy/common/time.c @@ -146,7 +146,7 @@ static int __init alchemy_time_init(unsigned int m2int) cd->shift = 32; cd->mult = div_sc(32768, NSEC_PER_SEC, cd->shift); cd->max_delta_ns = clockevent_delta2ns(0xffffffff, cd); - cd->min_delta_ns = clockevent_delta2ns(8, cd); /* ~0.25ms */ + cd->min_delta_ns = clockevent_delta2ns(9, cd); /* ~0.28ms */ clockevents_register_device(cd); setup_irq(m2int, &au1x_rtcmatch2_irqaction); |
