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MIPS: Alchemy: Increase minimum timeout for 32kHz timer.

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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>
This commit is contained in:
Manuel Lauss 2011-12-20 17:37:29 +01:00 committed by Ralf Baechle
parent 193fb42613
commit 8e36579035
1 changed files with 1 additions and 1 deletions
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arch/mips/alchemy/common/time.c
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@ -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);