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[MIPS] Sibyte: Stop timers before programming next even.

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We have no guarantee by the generic time code that the timer is stopped
when the ->next_event method is called.  Modifying the Timer Initial Count
register while the timer is enabled has UNPREDICTABLE effect according to
the BCM1250/BCM1125/BCM1125H User Manual.  So stop the timer before
reprogramming.

This is a paranoia fix; no ill effects have been observed previously.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle 2007-11-11 17:33:55 +00:00
parent 622477533d
commit 8dfa741f14
2 changed files with 2 additions and 0 deletions
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1
arch/mips/kernel/cevt-bcm1480.c
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@ -75,6 +75,7 @@ static int sibyte_next_event(unsigned long delta, struct clock_event_device *cd)
cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
init = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_INIT));
__raw_writeq(0, cfg);
__raw_writeq(delta - 1, init);
__raw_writeq(M_SCD_TIMER_ENABLE, cfg);

1
arch/mips/kernel/cevt-sb1250.c
View File

@ -73,6 +73,7 @@ static int sibyte_next_event(unsigned long delta, struct clock_event_device *cd)
cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
init = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_INIT));
__raw_writeq(0, cfg);
__raw_writeq(delta - 1, init);
__raw_writeq(M_SCD_TIMER_ENABLE, cfg);