linux-kernel - Re: [PATCH v2 3/3] clocksource/drivers/timer-riscv: Stop stimecmp when cpu hotplug

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Message-ID: <CAAhSdy3iB++KRj_q5GS5qpri2A9OZii=p1itxiXQnoos3So3GA@mail.gmail.com>
Date: Thu, 26 Sep 2024 15:10:58 +0530
From: Anup Patel <anup@...infault.org>
To: Nick Hu <nick.hu@...ive.com>
Cc: greentime.hu@...ive.com, zong.li@...ive.com, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, "Rafael J. Wysocki" <rafael@...nel.org>, Pavel Machek <pavel@....cz>, 
	Daniel Lezcano <daniel.lezcano@...aro.org>, Thomas Gleixner <tglx@...utronix.de>, 
	Andrew Jones <ajones@...tanamicro.com>, Mayuresh Chitale <mchitale@...tanamicro.com>, 
	Conor Dooley <conor.dooley@...rochip.com>, Atish Patra <atishp@...osinc.com>, 
	Samuel Holland <samuel.holland@...ive.com>, Samuel Ortiz <sameo@...osinc.com>, 
	Sunil V L <sunilvl@...tanamicro.com>, linux-riscv@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v2 3/3] clocksource/drivers/timer-riscv: Stop stimecmp
 when cpu hotplug

On Thu, Sep 26, 2024 at 12:26 PM Nick Hu <nick.hu@...ive.com> wrote:
>
> Stop the stimecmp when the cpu is going to be off otherwise the timer
> stimecmp register while cpu non retention suspend.
>
> Suggested-by: Anup Patel <anup@...infault.org>
> Link: https://lore.kernel.org/lkml/20240829033904.477200-3-nick.hu@sifive.com/T/#u
> Signed-off-by: Nick Hu <nick.hu@...ive.com>

LGTM.

Reviewed-by: Anup Patel <anup@...infault.org>

Regards,
Anup

> ---
>  drivers/clocksource/timer-riscv.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/drivers/clocksource/timer-riscv.c b/drivers/clocksource/timer-riscv.c
> index 48ce50c5f5e6..166dee14e46b 100644
> --- a/drivers/clocksource/timer-riscv.c
> +++ b/drivers/clocksource/timer-riscv.c
> @@ -127,6 +127,12 @@ static int riscv_timer_starting_cpu(unsigned int cpu)
>  static int riscv_timer_dying_cpu(unsigned int cpu)
>  {
>         disable_percpu_irq(riscv_clock_event_irq);
> +       /*
> +        * Stop the timer when the cpu is going to be offline otherwise
> +        * the timer interrupt may be pending while performing power-down.
> +        */
> +       riscv_clock_event_stop();
> +
>         return 0;
>  }
>
> --
> 2.34.1
>