linux-kernel - Re: [PATCH v2 2/3] ARM: dts: rockchip: Use the GPU to cool CPU thermal zone of veyron mickey

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Date:   Mon, 20 May 2019 16:26:10 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Heiko Stuebner <heiko@...ech.de>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/3] ARM: dts: rockchip: Use the GPU to cool CPU
 thermal zone of veyron mickey

Hi,

On Mon, May 20, 2019 at 3:01 PM Matthias Kaehlcke <mka@...omium.org> wrote:
>
> On rk3288 the CPU and GPU temperatures are correlated. Limit the GPU
> frequency on veyron mickey to 400 MHz for CPU temperatures >= 65°C
> and to 300 MHz for CPU temperatures >= 85°C.
>
> This matches the configuration of the downstream Chrome OS 3.14 kernel,
> the 'official' kernel for mickey.
>
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> ---
> Changes in v2:
> - added 'cpu_warm_limit_gpu' to throttle GPU for T.cpu >= 65°C
> - removed comment saying that GPU isn't throttled beyond 400 MHz
>   based on CPU temperature
> - updated commit message
>
> Note: this patch depends on "ARM: dts: rockchip: Add #cooling-cells
> entry for rk3288 GPU" (https://lore.kernel.org/patchwork/patch/1075005/)
> ---
>  arch/arm/boot/dts/rk3288-veyron-mickey.dts | 14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)

Reviewed-by: Douglas Anderson <dianders@...omium.org>