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clocksource: sh_cmt: One-off clockevent fix V2

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Fix a one-off error in the CMT driver V2. The match register
should be programmed with the period minus one.

Many thanks to Eiraku-san for tracking down this issue.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm 2010-08-04 04:31:38 +00:00 committed by Paul Mundt
parent 7b42176a29
commit 43809473b9
1 changed files with 5 additions and 5 deletions
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10
drivers/clocksource/sh_cmt.c
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@ -308,7 +308,7 @@ static irqreturn_t sh_cmt_interrupt(int irq, void *dev_id)
* isr before we end up here.
*/
if (p->flags & FLAG_CLOCKSOURCE)
p->total_cycles += p->match_value;
p->total_cycles += p->match_value + 1;
if (!(p->flags & FLAG_REPROGRAM))
p->next_match_value = p->max_match_value;
@ -403,7 +403,7 @@ static cycle_t sh_cmt_clocksource_read(struct clocksource *cs)
raw = sh_cmt_get_counter(p, &has_wrapped);
if (unlikely(has_wrapped))
raw += p->match_value;
raw += p->match_value + 1;
spin_unlock_irqrestore(&p->lock, flags);
return value + raw;
@ -478,7 +478,7 @@ static void sh_cmt_clock_event_start(struct sh_cmt_priv *p, int periodic)
ced->min_delta_ns = clockevent_delta2ns(0x1f, ced);
if (periodic)
sh_cmt_set_next(p, (p->rate + HZ/2) / HZ);
sh_cmt_set_next(p, ((p->rate + HZ/2) / HZ) - 1);
else
sh_cmt_set_next(p, p->max_match_value);
}
@ -523,9 +523,9 @@ static int sh_cmt_clock_event_next(unsigned long delta,
BUG_ON(ced->mode != CLOCK_EVT_MODE_ONESHOT);
if (likely(p->flags & FLAG_IRQCONTEXT))
p->next_match_value = delta;
p->next_match_value = delta - 1;
else
sh_cmt_set_next(p, delta);
sh_cmt_set_next(p, delta - 1);
return 0;
}