linux-kernel - Re: [linux-sunxi] [PATCH 0/7] Add support for Allwinner H6 DVFS

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Message-ID: <20200405145443.uycsh73kxmurdmil@core.my.home>
Date:   Sun, 5 Apr 2020 16:54:43 +0200
From:   Ondřej Jirman <megous@...ous.com>
To:     Clément Péron <peron.clem@...il.com>
Cc:     Maxime Ripard <mripard@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [linux-sunxi] [PATCH 0/7] Add support for Allwinner H6 DVFS

Hi,

On Sun, Apr 05, 2020 at 04:33:37PM +0200, Clément Péron wrote:
> Hi Ondřej,

[ ... ]

> Good point, this information should be added for both CPU and GPU regulator.
> This could be nice to confirm this point with a scope.
> 
> Also I remark that Allwinner user higher temperature than what we set :
> alarm_low_temp = <105000>;
> alarm_high_temp = <110000>;
> alarm_temp_hysteresis = <15000>;
> shut_temp= <115000>;
> https://github.com/orangepi-xunlong/OrangePiH6_Linux4_9/blob/master/arch/arm64/boot/dts/sunxi/sun50iw6p1.dtsi#L1924
> 
> Don't you think that we can push a bit higher the temperature it's
> actually at 80°C ?

We probably can. But just 5°C between high temp and criticla temp is probably
not enough. I'd probably set our value to something like 90-100°C so that quick
temperature spike before regulation kicks in would not shutdown the CPU.

regards,
	o.

> Thanks for the review,
> Clement
>