Re: [PATCH-for-9.0 v2 1/8] hw/clock: Have clock_set_mul_div() return early when nothing to change

From: Alistair Francis <alistair23@gmail.com>
To: "Philippe Mathieu-Daudé" <philmd@linaro.org>
Cc: qemu-devel@nongnu.org,
	"Inès Varhol" <ines.varhol@telecom-paris.fr>,
	"Arnaud Minier" <arnaud.minier@telecom-paris.fr>,
	"Damien Hedde" <damien.hedde@dahe.fr>,
	qemu-arm@nongnu.org, "Peter Maydell" <peter.maydell@linaro.org>,
	"Alistair Francis" <alistair@alistair23.me>,
	"Luc Michel" <luc@lmichel.fr>
Subject: Re: [PATCH-for-9.0 v2 1/8] hw/clock: Have clock_set_mul_div() return early when nothing to change
Date: Tue, 26 Mar 2024 13:13:41 +1000	[thread overview]
Message-ID: <CAKmqyKOMY=OhVUie9wQQ5pFfemjihrHW3u3dA7KxkJYoHVVyiA@mail.gmail.com> (raw)
In-Reply-To: <20240325133259.57235-2-philmd@linaro.org>

On Mon, Mar 25, 2024 at 11:34 PM Philippe Mathieu-Daudé
<philmd@linaro.org> wrote:
>
> Return early when clock_set_mul_div() is called with
> same mul/div values the clock has.
>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

Alistair

> ---
>  hw/core/clock.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/hw/core/clock.c b/hw/core/clock.c
> index d82e44cd1a..c73f0c2f98 100644
> --- a/hw/core/clock.c
> +++ b/hw/core/clock.c
> @@ -147,6 +147,10 @@ void clock_set_mul_div(Clock *clk, uint32_t multiplier, uint32_t divider)
>  {
>      assert(divider != 0);
>
> +    if (clk->multiplier == multiplier && clk->divider == divider) {
> +        return;
> +    }
> +
>      trace_clock_set_mul_div(CLOCK_PATH(clk), clk->multiplier, multiplier,
>                              clk->divider, divider);
>      clk->multiplier = multiplier;
> --
> 2.41.0
>
>