linux-kernel - Re: [PATCH v4 4/5] MIPS: CI20: Reduce clocksource to 750 kHz.

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Date:   Wed, 30 Jun 2021 13:21:15 +0100
From:   Paul Cercueil <paul@...pouillou.net>
To:     周琰杰 <zhouyanjie@...yeetech.com>
Cc:     tsbogend@...ha.franken.de, mturquette@...libre.com,
        sboyd@...nel.org, robh+dt@...nel.org, linux-mips@...r.kernel.org,
        devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, dongsheng.qiu@...enic.com,
        aric.pzqi@...enic.com, rick.tyliu@...enic.com,
        sihui.liu@...enic.com, jun.jiang@...enic.com,
        sernia.zhou@...mail.com
Subject: Re: [PATCH v4 4/5] MIPS: CI20: Reduce clocksource to 750 kHz.

Hi Zhou,

Le sam., juin 26 2021 at 14:18:40 +0800, 周琰杰 (Zhou Yanjie) 
<zhouyanjie@...yeetech.com> a écrit :
> The original clock (3 MHz) is too fast for the clocksource,
> there will be a chance that the system may get stuck.
> 
> Reported-by: Nikolaus Schaller <hns@...delico.com>
> Tested-by: Nikolaus Schaller <hns@...delico.com> # on CI20
> Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@...yeetech.com>

Acked-by: Paul Cercueil <paul@...pouillou.net>

Cheers,
-Paul

> ---
> 
> Notes:
>     v4:
>     New patch.
> 
>  arch/mips/boot/dts/ingenic/ci20.dts | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/mips/boot/dts/ingenic/ci20.dts 
> b/arch/mips/boot/dts/ingenic/ci20.dts
> index 8877c62..3a4eaf1 100644
> --- a/arch/mips/boot/dts/ingenic/ci20.dts
> +++ b/arch/mips/boot/dts/ingenic/ci20.dts
> @@ -525,10 +525,10 @@
> 
>  &tcu {
>  	/*
> -	 * 750 kHz for the system timer and 3 MHz for the clocksource,
> +	 * 750 kHz for the system timer and clocksource,
>  	 * use channel #0 for the system timer, #1 for the clocksource.
>  	 */
>  	assigned-clocks = <&tcu TCU_CLK_TIMER0>, <&tcu TCU_CLK_TIMER1>,
>  					  <&tcu TCU_CLK_OST>;
> -	assigned-clock-rates = <750000>, <3000000>, <3000000>;
> +	assigned-clock-rates = <750000>, <750000>, <3000000>;
>  };
> --
> 2.7.4
>