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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 v4 05/22] clocksource: h8300_timer8: don't reset rate in ->set_state_oneshot()
Date: Tue, 23 Aug 2016 01:33:03 +0200	[thread overview]
Message-ID: <20160822233320.4548-6-nicstange@gmail.com> (raw)
In-Reply-To: <20160822233320.4548-1-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);
 }
 
-- 
2.9.2

  parent reply	other threads:[~2016-08-22 23:37 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-08-22 23:32 [RFC v4 00/22] adapt clockevents frequencies to mono clock Nicolai Stange
2016-08-22 23:32 ` [RFC v4 01/22] clocksource: sh_cmt: compute rate before registration again Nicolai Stange
2016-08-22 23:33 ` [RFC v4 02/22] clocksource: sh_tmu: " Nicolai Stange
2016-08-22 23:33 ` [RFC v4 03/22] clocksource: em_sti: split clock prepare and enable steps Nicolai Stange
2016-08-22 23:33 ` [RFC v4 04/22] clocksource: em_sti: compute rate before registration Nicolai Stange
2016-08-22 23:33 ` Nicolai Stange [this message]
2016-08-22 23:33 ` [RFC v4 06/22] clockevents: make clockevents_config() static Nicolai Stange
2016-08-22 23:33 ` [RFC v4 07/22] many clockevent drivers: set ->min_delta_ticks and ->max_delta_ticks Nicolai Stange
2016-08-22 23:33 ` [RFC v4 08/22] arch/s390/kernel/time: " Nicolai Stange
2016-08-22 23:33 ` [RFC v4 09/22] arch/x86/platform/uv/uv_time: " Nicolai Stange
2016-08-22 23:33 ` [RFC v4 10/22] arch/tile/kernel/time: " Nicolai Stange
2016-09-06 19:19   ` Chris Metcalf
2016-09-08 11:21     ` Nicolai Stange
2016-09-09 16:25       ` Chris Metcalf
2016-08-22 23:33 ` [RFC v4 11/22] clockevents: always initialize ->min_delta_ns and ->max_delta_ns Nicolai Stange
2016-08-22 23:33 ` [RFC v4 12/22] many clockevent drivers: don't set " Nicolai Stange
2016-08-22 23:33 ` [RFC v4 13/22] clockevents: check a programmed delta's bounds in terms of cycles Nicolai Stange
2016-08-27 15:20   ` Nicolai Stange
2016-08-31  8:31     ` Nicolai Stange
2016-08-22 23:33 ` [RFC v4 14/22] clockevents: clockevents_program_event(): turn clc into unsigned long Nicolai Stange
2016-08-25 13:20   ` Thomas Gleixner
2016-08-27 15:23     ` Nicolai Stange
2016-08-22 23:33 ` [RFC v4 15/22] clockevents: clockevents_program_min_delta(): don't set ->next_event Nicolai Stange
2016-08-22 23:33 ` [RFC v4 16/22] clockevents: use ->min_delta_ticks_adjusted to program minimum delta Nicolai Stange
2016-08-24  9:28   ` Nicolai Stange
2016-08-22 23:33 ` [RFC v4 17/22] clockevents: min delta increment: calculate min_delta_ns from ticks Nicolai Stange
2016-08-22 23:33 ` [RFC v4 18/22] timer_list: print_tickdevice(): calculate ->*_delta_ns dynamically Nicolai Stange
2016-08-22 23:33 ` [RFC v4 19/22] clockevents: purge ->min_delta_ns and ->max_delta_ns Nicolai Stange
2016-08-22 23:33 ` [RFC v4 20/22] clockevents: initial support for mono to raw time conversion Nicolai Stange
2016-08-22 23:33 ` [RFC v4 21/22] clockevents: make setting of ->mult and ->mult_adjusted atomic Nicolai Stange
2016-08-22 23:33 ` [RFC v4 22/22] timekeeping: inform clockevents about freq adjustments Nicolai Stange
2016-08-24  9:40   ` Nicolai Stange
2016-08-25 14:56   ` Thomas Gleixner
2016-08-25 15:25   ` Thomas Gleixner

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