From: Michal Simek <monstr@monstr.eu>
To: Nicolai Stange <nicstange@gmail.com>
Cc: John Stultz <john.stultz@linaro.org>,
linux-kernel@vger.kernel.org,
Daniel Lezcano <daniel.lezcano@linaro.org>
Subject: Re: [PATCH] microblaze/timer: set ->min_delta_ticks and ->max_delta_ticks
Date: Mon, 29 May 2017 11:03:27 +0200 [thread overview]
Message-ID: <b47fb594-d413-0398-116c-f8b0f70ecc97@monstr.eu> (raw)
In-Reply-To: <20170330194528.7047-1-nicstange@gmail.com>
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On 30.3.2017 21:45, 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 microblaze 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/microblaze/kernel/timer.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/microblaze/kernel/timer.c b/arch/microblaze/kernel/timer.c
> index 999066192715..545ccd46edb3 100644
> --- a/arch/microblaze/kernel/timer.c
> +++ b/arch/microblaze/kernel/timer.c
> @@ -178,8 +178,10 @@ static __init int xilinx_clockevent_init(void)
> clockevent_xilinx_timer.shift);
> clockevent_xilinx_timer.max_delta_ns =
> clockevent_delta2ns((u32)~0, &clockevent_xilinx_timer);
> + clockevent_xilinx_timer.max_delta_ticks = (u32)~0;
> clockevent_xilinx_timer.min_delta_ns =
> clockevent_delta2ns(1, &clockevent_xilinx_timer);
> + clockevent_xilinx_timer.min_delta_ticks = 1;
> clockevent_xilinx_timer.cpumask = cpumask_of(0);
> clockevents_register_device(&clockevent_xilinx_timer);
>
>
Applied as
microblaze: Set ->min_delta_ticks and ->max_delta_ticks for timer
With Daniel's ACK.
Thanks,
Michal
--
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Xilinx Microblaze
Maintainer of Linux kernel - Xilinx Zynq ARM and ZynqMP ARM64 SoCs
U-Boot custodian - Xilinx Microblaze/Zynq/ZynqMP SoCs
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next prev parent reply other threads:[~2017-05-29 9:03 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-26 13:44 [PATCH] x86/apic/timer: set ->min_delta_ticks and ->max_delta_ticks Nicolai Stange
2017-03-30 19:39 ` [PATCH] avr32/time: " Nicolai Stange
2017-04-03 6:42 ` Hans-Christian Noren Egtvedt
2017-03-30 19:41 ` [PATCH] blackfin: time-ts: " Nicolai Stange
2017-03-30 19:42 ` [PATCH] c6x/timer64: " Nicolai Stange
2017-03-30 19:43 ` [PATCH] hexagon/time: " Nicolai Stange
2017-04-03 15:49 ` Richard Kuo
2017-03-30 19:44 ` [PATCH] m68k/coldfire/pit: " Nicolai Stange
2017-03-31 1:10 ` Greg Ungerer
2017-03-30 19:45 ` [PATCH] microblaze/timer: " Nicolai Stange
2017-04-07 13:14 ` Daniel Lezcano
2017-04-16 2:47 ` Nicolai Stange
2017-04-16 9:46 ` Daniel Lezcano
2017-05-29 9:03 ` Michal Simek [this message]
2017-03-30 19:47 ` [PATCH] MIPS: clockevent drivers: " Nicolai Stange
2017-04-12 20:10 ` Ralf Baechle
2017-03-30 19:48 ` [PATCH] mn10300/cevt-mn10300: " Nicolai Stange
2017-03-30 19:53 ` [PATCH] powerpc/time: " Nicolai Stange
2017-03-31 3:03 ` Michael Ellerman
2017-03-30 19:54 ` [PATCH] s390/time: " Nicolai Stange
2017-03-30 19:55 ` [PATCH] score/time: " Nicolai Stange
2017-03-30 19:56 ` [PATCH] sparc/time: " Nicolai Stange
2017-04-01 19:18 ` David Miller
2017-03-30 19:57 ` [PATCH] tile/time: " Nicolai Stange
2017-03-30 19:59 ` [PATCH] um/time: " Nicolai Stange
2017-03-30 20:01 ` [PATCH] unicore32/time: " Nicolai Stange
2017-03-31 1:59 ` Xuetao Guan
2017-03-30 20:03 ` [PATCH] x86/lguest/timer: " Nicolai Stange
2017-04-02 1:35 ` Rusty Russell
2017-03-30 20:04 ` [PATCH] x86/uv/time: " Nicolai Stange
2017-03-30 20:06 ` [PATCH] x86/xen/time: " Nicolai Stange
2017-03-30 22:59 ` Boris Ostrovsky
2017-04-06 9:11 ` Juergen Gross
2017-04-11 5:09 ` Juergen Gross
2017-03-30 20:07 ` [PATCH] clockevents/drivers/dw_apb: " Nicolai Stange
2017-04-07 13:20 ` Daniel Lezcano
2017-03-30 20:08 ` [PATCH] clockevents/drivers/metag: " Nicolai Stange
2017-04-07 13:20 ` Daniel Lezcano
2017-03-30 20:08 ` [PATCH] x86/numachip timer: " Nicolai Stange
2017-04-07 13:21 ` Daniel Lezcano
2017-03-30 20:09 ` [PATCH] clockevents/drivers/sh_cmt: " Nicolai Stange
2017-04-07 13:22 ` Daniel Lezcano
2017-03-30 20:10 ` [PATCH] clockevents/drivers/atlas7: " Nicolai Stange
2017-04-07 13:23 ` Daniel Lezcano
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