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[PATCH] avr32/time: set ->min_delta_ticks and ->max_delta_ticks

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  [PATCH] avr32/time: set ->min_delta_ticks and ->max_delta_ticks Nicolai Stange <nicstange@gmail.com> - 2017-03-30 21:50 +0200
    Re: [PATCH] avr32/time: set ->min_delta_ticks and ->max_delta_ticks Hans-Christian Noren Egtvedt <egtvedt@samfundet.no> - 2017-04-03 08:50 +0200

#1613406 — [PATCH] avr32/time: set ->min_delta_ticks and ->max_delta_ticks

In preparation for making the clockevents core NTP correction aware,
all clockevent device drivers must set ->min_delta_ticks and
->max_delta_ticks rather than ->min_delta_ns and ->max_delta_ns: a
clockevent device's rate is going to change dynamically and thus, the
ratio of ns to ticks ceases to stay invariant.

Make the avr32 arch's clockevent driver initialize these fields properly.

This patch alone doesn't introduce any change in functionality as the
clockevents core still looks exclusively at the (untouched) ->min_delta_ns
and ->max_delta_ns. As soon as this has changed, a followup patch will
purge the initialization of ->min_delta_ns and ->max_delta_ns from this
driver.

Signed-off-by: Nicolai Stange <nicstange@gmail.com>
---

Notes:
    This prerequisite patch is part of a larger effort to feed NTP
    corrections into the clockevent devices' frequencies and thus
    avoiding their notion of time to diverge from the system's
    one. If you're interested, the current state of the whole series
    can be found at [1].
    
    If you haven't got any objections and these prerequisites get
    merged by 4.12 everywhere, I'll proceed with the remainder of
    this series in 4.13.
    
    Applicable to next-20170324 as well as to John' Stultz tree [2].
    
    [1]
      git://nicst.de/linux.git cev-freq-adj.v10.fortglx-4.12-time
      https://nicst.de/git/?p=linux.git;a=shortlog;h=refs/heads/cev-freq-adj.v10.fortglx-4.12-time
    
    [2]
      https://git.linaro.org/people/john.stultz/linux.git fortglx/4.12/time

 arch/avr32/kernel/time.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/avr32/kernel/time.c b/arch/avr32/kernel/time.c
index 4d9b69615979..fe98273fc0dc 100644
--- a/arch/avr32/kernel/time.c
+++ b/arch/avr32/kernel/time.c
@@ -142,7 +142,9 @@ void __init time_init(void)
 	/* setup COMPARE clockevent */
 	comparator.mult = div_sc(counter_hz, NSEC_PER_SEC, comparator.shift);
 	comparator.max_delta_ns = clockevent_delta2ns((u32)~0, &comparator);
+	comparator.max_delta_ticks = (u32)~0;
 	comparator.min_delta_ns = clockevent_delta2ns(50, &comparator) + 1;
+	comparator.min_delta_ticks = 50;
 	comparator.cpumask = cpumask_of(0);
 
 	sysreg_write(COMPARE, 0);
-- 
2.12.0

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#1614911

Around Thu 30 Mar 2017 21:39:33 +0200 or thereabout, Nicolai Stange wrote:
> In preparation for making the clockevents core NTP correction aware,
> all clockevent device drivers must set ->min_delta_ticks and
> ->max_delta_ticks rather than ->min_delta_ns and ->max_delta_ns: a
> clockevent device's rate is going to change dynamically and thus, the
> ratio of ns to ticks ceases to stay invariant.
> 
> Make the avr32 arch's clockevent driver initialize these fields properly.
> 
> This patch alone doesn't introduce any change in functionality as the
> clockevents core still looks exclusively at the (untouched) ->min_delta_ns
> and ->max_delta_ns. As soon as this has changed, a followup patch will
> purge the initialization of ->min_delta_ns and ->max_delta_ns from this
> driver.
> 
> Signed-off-by: Nicolai Stange <nicstange@gmail.com>

-1

Please do not spend time on AVR32 architecture. It will be removed in the
next merge window.

<snipp diff>

-- 
Best regards,
Hans-Christian Noren Egtvedt

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