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powerpc/time: Use clockevents_register_device(), fixing an issue with large decrementer

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We currently cap the decrementer clockevent at 4 seconds, even on systems
with large decrementer support. Fix this by converting the code to use
clockevents_register_device() which calculates the upper bound based on
the max_delta passed in.

Signed-off-by: Anton Blanchard <anton@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Anton Blanchard 2018-10-02 09:01:04 +10:00 committed by Michael Ellerman
parent f86ad3e019
commit 8b78fdb045
1 changed files with 3 additions and 14 deletions
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17
arch/powerpc/kernel/time.c
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@ -984,10 +984,10 @@ static void register_decrementer_clockevent(int cpu)
*dec = decrementer_clockevent;
dec->cpumask = cpumask_of(cpu);
clockevents_config_and_register(dec, ppc_tb_freq, 2, decrementer_max);
printk_once(KERN_DEBUG "clockevent: %s mult[%x] shift[%d] cpu[%d]\n",
dec->name, dec->mult, dec->shift, cpu);
clockevents_register_device(dec);
}
static void enable_large_decrementer(void)
@ -1035,18 +1035,7 @@ static void __init set_decrementer_max(void)
static void __init init_decrementer_clockevent(void)
{
int cpu = smp_processor_id();
clockevents_calc_mult_shift(&decrementer_clockevent, ppc_tb_freq, 4);
decrementer_clockevent.max_delta_ns =
clockevent_delta2ns(decrementer_max, &decrementer_clockevent);
decrementer_clockevent.max_delta_ticks = decrementer_max;
decrementer_clockevent.min_delta_ns =
clockevent_delta2ns(2, &decrementer_clockevent);
decrementer_clockevent.min_delta_ticks = 2;
register_decrementer_clockevent(cpu);
register_decrementer_clockevent(smp_processor_id());
}
void secondary_cpu_time_init(void)