From: Nicolai Stange <nicstange@gmail.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <john.stultz@linaro.org>,
linux-kernel@vger.kernel.org,
Nicolai Stange <nicstange@gmail.com>
Subject: [RFC v7 05/23] clocksource: h8300_timer8: don't reset rate in ->set_state_oneshot()
Date: Fri, 16 Sep 2016 22:08:33 +0200 [thread overview]
Message-ID: <20160916200851.9273-6-nicstange@gmail.com> (raw)
In-Reply-To: <20160916200851.9273-1-nicstange@gmail.com>
With the upcoming NTP correction related rate adjustments to be implemented
in the clockevents core, the latter needs to get informed about every rate
change of a clockevent device made after its registration.
Currently, h8300_timer8 violates this requirement in that it registers its
clockevent device with the correct rate, but resets its ->mult and ->rate
values in timer8_clock_event_start(), called from its ->set_state_oneshot()
function.
It seems like
commit 4633f4cac85a ("clocksource/drivers/h8300: Cleanup startup and
remove module code."),
which introduced the rate initialization at registration, missed to remove
the manual setting of ->mult and ->shift from timer8_clock_event_start().
Purge the setting of ->mult, ->shift, ->min_delta_ns and ->max_delta_ns
from timer8_clock_event_start().
Signed-off-by: Nicolai Stange <nicstange@gmail.com>
---
Notes:
Compile-only tested on ARCH=h8300.
drivers/clocksource/h8300_timer8.c | 8 --------
1 file changed, 8 deletions(-)
diff --git a/drivers/clocksource/h8300_timer8.c b/drivers/clocksource/h8300_timer8.c
index 546bb18..804c489 100644
--- a/drivers/clocksource/h8300_timer8.c
+++ b/drivers/clocksource/h8300_timer8.c
@@ -101,15 +101,7 @@ static inline struct timer8_priv *ced_to_priv(struct clock_event_device *ced)
static void timer8_clock_event_start(struct timer8_priv *p, unsigned long delta)
{
- struct clock_event_device *ced = &p->ced;
-
timer8_start(p);
-
- ced->shift = 32;
- ced->mult = div_sc(p->rate, NSEC_PER_SEC, ced->shift);
- ced->max_delta_ns = clockevent_delta2ns(0xffff, ced);
- ced->min_delta_ns = clockevent_delta2ns(0x0001, ced);
-
timer8_set_next(p, delta);
}
--
2.10.0
next prev parent reply other threads:[~2016-09-16 20:09 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-16 20:08 [RFC v7 00/23] adapt clockevents frequencies to mono clock Nicolai Stange
2016-09-16 20:08 ` [RFC v7 01/23] clocksource: sh_cmt: compute rate before registration again Nicolai Stange
2016-09-16 20:08 ` [RFC v7 02/23] clocksource: sh_tmu: " Nicolai Stange
2016-09-16 20:08 ` [RFC v7 03/23] clocksource: em_sti: split clock prepare and enable steps Nicolai Stange
2016-09-16 20:08 ` [RFC v7 04/23] clocksource: em_sti: compute rate before registration Nicolai Stange
2016-09-16 20:08 ` Nicolai Stange [this message]
2016-09-16 20:08 ` [RFC v7 06/23] clockevents: make clockevents_config() static Nicolai Stange
2016-09-16 20:08 ` [RFC v7 07/23] many clockevent drivers: set ->min_delta_ticks and ->max_delta_ticks Nicolai Stange
2016-09-16 20:08 ` [RFC v7 08/23] arch/s390/kernel/time: " Nicolai Stange
2016-09-16 20:08 ` [RFC v7 09/23] arch/x86/platform/uv/uv_time: " Nicolai Stange
2016-09-16 20:08 ` [RFC v7 10/23] arch/tile/kernel/time: " Nicolai Stange
2016-09-16 20:08 ` [RFC v7 11/23] clockevents: always initialize ->min_delta_ns and ->max_delta_ns Nicolai Stange
2016-09-16 20:11 ` [RFC v7 12/23] many clockevent drivers: don't set " Nicolai Stange
2016-09-16 20:11 ` [RFC v7 13/23] clockevents: introduce CLOCK_EVT_FEAT_NO_ADJUST flag Nicolai Stange
2016-09-16 20:11 ` [RFC v7 14/23] clockevents: decouple ->max_delta_ns from ->max_delta_ticks Nicolai Stange
2016-09-16 20:11 ` [RFC v7 15/23] clockevents: do comparison of delta against minimum in terms of cycles Nicolai Stange
2016-09-16 20:11 ` [RFC v7 16/23] clockevents: clockevents_program_min_delta(): don't set ->next_event Nicolai Stange
2016-09-16 20:11 ` [RFC v7 17/23] clockevents: use ->min_delta_ticks_adjusted to program minimum delta Nicolai Stange
2016-09-16 20:11 ` [RFC v7 18/23] clockevents: min delta increment: calculate min_delta_ns from ticks Nicolai Stange
2016-09-16 20:12 ` [RFC v7 19/23] timer_list: print_tickdevice(): calculate ->min_delta_ns dynamically Nicolai Stange
2016-09-16 20:12 ` [RFC v7 20/23] clockevents: purge ->min_delta_ns Nicolai Stange
2016-09-16 20:12 ` [RFC v7 21/23] clockevents: initial support for mono to raw time conversion Nicolai Stange
2016-09-16 20:12 ` [RFC v7 22/23] clockevents: make setting of ->mult and ->mult_adjusted atomic Nicolai Stange
2016-09-16 20:27 ` [RFC v7 23/23] timekeeping: inform clockevents about freq adjustments Nicolai Stange
2016-09-20 20:54 ` [RFC v7 00/23] adapt clockevents frequencies to mono clock Thomas Gleixner
2016-09-20 23:08 ` Nicolai Stange
2016-09-20 23:36 ` Thomas Gleixner
2016-09-21 14:06 ` Nicolai Stange
2016-09-22 21:39 ` Thomas Gleixner
2016-09-22 22:39 ` Nicolai Stange
2016-09-26 10:15 ` Nicolai Stange
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