linux-kernel - Re: [linux-sunxi] [PATCH v3 30/30] ARM: sun8i: a83t: full range OPP tables and CPUfreq

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Message-ID: <20180830163833.v7zvmaz2vsxvzhur@core>
Date:   Thu, 30 Aug 2018 18:38:33 +0200
From:   Ondřej Jirman <megous@...ous.com>
To:     Philipp Rossak <embed3d@...il.com>
Cc:     lee.jones@...aro.org, robh+dt@...nel.org, mark.rutland@....com,
        maxime.ripard@...tlin.com, wens@...e.org, linux@...linux.org.uk,
        jic23@...nel.org, knaack.h@....de, lars@...afoo.de,
        pmeerw@...erw.net, eugen.hristev@...rochip.com,
        rdunlap@...radead.org, vilhelm.gray@...il.com,
        clabbe.montjoie@...il.com, quentin.schulz@...tlin.com,
        geert+renesas@...der.be, lukas@...ner.de, icenowy@...c.io,
        arnd@...db.de, broonie@...nel.org, arnaud.pouliquen@...com,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [linux-sunxi] [PATCH v3 30/30] ARM: sun8i: a83t: full range OPP
 tables and CPUfreq

Hello,

On Thu, Aug 30, 2018 at 05:45:18PM +0200, Philipp Rossak wrote:
> Since we have now thermal trotteling enabeled we can now add the full
> range of the OPP table.

I'm not sure we can. I have a tablet with A83T SoC and it gets unstable
at these frequencies even with thermal throttling on mainline kernel. (Though
I have my own THS driver, but I doubt a different driver will change much.)

There might be some other issue left in the cpufreq code. I'll let others
test this on a better cooled boards though.

Did you/someone test this?

regards,
  o.

> The operating points were found in Allwinner BSP and fex files.
> 
> Signed-off-by: Philipp Rossak <embed3d@...il.com>
> ---
>  arch/arm/boot/dts/sun8i-a83t.dtsi | 32 ++++++++++++++++++++++++++++++++
>  1 file changed, 32 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/sun8i-a83t.dtsi b/arch/arm/boot/dts/sun8i-a83t.dtsi
> index 78aa448e869f..ddcf404f9c80 100644
> --- a/arch/arm/boot/dts/sun8i-a83t.dtsi
> +++ b/arch/arm/boot/dts/sun8i-a83t.dtsi
> @@ -250,6 +250,22 @@
>  			opp-microvolt = <840000>;
>  			clock-latency-ns = <244144>; /* 8 32k periods */
>  		};
> +
> +		opp-1608000000 {
> +			opp-hz = /bits/ 64 <1608000000>;
> +			opp-microvolt = <920000>;
> +			clock-latency-ns = <244144>; /* 8 32k periods */
> +		};
> +		opp-1800000000 { /* BOOT FREQ */
> +			opp-hz = /bits/ 64 <1800000000>;
> +			opp-microvolt = <1000000>;
> +			clock-latency-ns = <244144>; /* 8 32k periods */
> +		};
> +		opp-2016000000 {
> +			opp-hz = /bits/ 64 <2016000000>;
> +			opp-microvolt = <1080000>;
> +			clock-latency-ns = <244144>; /* 8 32k periods */
> +		};
>  	};
>  
>  	cpu1_opp_table: opp_table1 {
> @@ -303,6 +319,22 @@
>  			opp-microvolt = <840000>;
>  			clock-latency-ns = <244144>; /* 8 32k periods */
>  		};
> +
> +		opp-1608000000 {
> +			opp-hz = /bits/ 64 <1608000000>;
> +			opp-microvolt = <920000>;
> +			clock-latency-ns = <244144>; /* 8 32k periods */
> +		};
> +		opp-1800000000 { /* BOOT FREQ */
> +			opp-hz = /bits/ 64 <1800000000>;
> +			opp-microvolt = <1000000>;
> +			clock-latency-ns = <244144>; /* 8 32k periods */
> +		};
> +		opp-2016000000 {
> +			opp-hz = /bits/ 64 <2016000000>;
> +			opp-microvolt = <1080000>;
> +			clock-latency-ns = <244144>; /* 8 32k periods */
> +		};
>  	};
>  
>  	soc {
> -- 
> 2.11.0
> 
> -- 
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