Commit-ID: 7fd534247d1b6fcd399ab70f04db39047724898a
Gitweb: http://git.kernel.org/tip/7fd534247d1b6fcd399ab70f04db39047724898a
Author: Nicolai Stange <nicstange@xxxxxxxxx>
AuthorDate: Thu, 30 Mar 2017 21:56:47 +0200
Committer: John Stultz <john.stultz@xxxxxxxxxx>
CommitDate: Fri, 14 Apr 2017 13:11:11 -0700
sparc/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 sparc arch's clockevent drivers 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 these
drivers.
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Cc: Richard Cochran <richardcochran@xxxxxxxxx>
Cc: Prarit Bhargava <prarit@xxxxxxxxxx>
Cc: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: sparclinux@xxxxxxxxxxxxxxx
Acked-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Nicolai Stange <nicstange@xxxxxxxxx>
Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx>
---
arch/sparc/kernel/time_32.c | 2 ++
arch/sparc/kernel/time_64.c | 2 ++
2 files changed, 4 insertions(+)
diff --git a/arch/sparc/kernel/time_32.c b/arch/sparc/kernel/time_32.c
index 244062b..9f575df 100644
--- a/arch/sparc/kernel/time_32.c
+++ b/arch/sparc/kernel/time_32.c
@@ -228,7 +228,9 @@ void register_percpu_ce(int cpu)
ce->mult = div_sc(sparc_config.clock_rate, NSEC_PER_SEC,
ce->shift);
ce->max_delta_ns = clockevent_delta2ns(sparc_config.clock_rate, ce);
+ ce->max_delta_ticks = (unsigned long)sparc_config.clock_rate;
ce->min_delta_ns = clockevent_delta2ns(100, ce);
+ ce->min_delta_ticks = 100;
clockevents_register_device(ce);
}
diff --git a/arch/sparc/kernel/time_64.c b/arch/sparc/kernel/time_64.c
index 12a6d35..98d05de 100644
--- a/arch/sparc/kernel/time_64.c
+++ b/arch/sparc/kernel/time_64.c
@@ -796,8 +796,10 @@ void __init time_init(void)
sparc64_clockevent.max_delta_ns =
clockevent_delta2ns(0x7fffffffffffffffUL, &sparc64_clockevent);
+ sparc64_clockevent.max_delta_ticks = 0x7fffffffffffffffUL;
sparc64_clockevent.min_delta_ns =
clockevent_delta2ns(0xF, &sparc64_clockevent);
+ sparc64_clockevent.min_delta_ticks = 0xF;
printk("clockevent: mult[%x] shift[%d]\n",
sparc64_clockevent.mult, sparc64_clockevent.shift);
--
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