linux-kernel - Re: [PATCH 1/1] clocksource/timer-risc: Add riscv_clock

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Date:   Wed, 15 Nov 2023 12:30:18 +0530
From:   Anup Patel <apatel@...tanamicro.com>
To:     Joshua Yeong <joshua.yeong@...rfivetech.com>
Cc:     daniel.lezcano@...aro.org, tglx@...utronix.de,
        paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, leyfoon.tan@...rfivetech.com,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH 1/1] clocksource/timer-risc: Add riscv_clock_shutdown callback

On Wed, Nov 15, 2023 at 11:49 AM Joshua Yeong
<joshua.yeong@...rfivetech.com> wrote:
>
> Add clocksource detach/shutdown callback to disable RISC-V timer interrupt when
> switching out riscv timer as clock source
>
> Signed-off-by: Joshua Yeong <joshua.yeong@...rfivetech.com>
> ---
>  drivers/clocksource/timer-riscv.c | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/drivers/clocksource/timer-riscv.c b/drivers/clocksource/timer-riscv.c
> index da3071b387eb..588a05459b6a 100644
> --- a/drivers/clocksource/timer-riscv.c
> +++ b/drivers/clocksource/timer-riscv.c
> @@ -50,12 +50,19 @@ static int riscv_clock_next_event(unsigned long delta,
>         return 0;
>  }
>
> +static int riscv_clock_shutdown(struct clock_event_device *evt)
> +{
> +       sbi_set_timer(-1);

Use riscv_clock_event_stop() here.

> +       return 0;
> +}
> +
>  static unsigned int riscv_clock_event_irq;
>  static DEFINE_PER_CPU(struct clock_event_device, riscv_clock_event) = {
>         .name                   = "riscv_timer_clockevent",
>         .features               = CLOCK_EVT_FEAT_ONESHOT,
>         .rating                 = 100,
>         .set_next_event         = riscv_clock_next_event,
> +       .set_state_shutdown     = riscv_clock_shutdown,
>  };
>
>  /*
> --
> 2.25.1
>

Regards,
Anup