linux-kernel - Re: [PATCH v1 1/7] PM / devfreq: tegra30: Support thermal cooling

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Message-ID: <65cdeb50-7ec1-4ed4-1eeb-342c4c915aa1@samsung.com>
Date:   Thu, 20 May 2021 11:50:50 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Dmitry Osipenko <digetx@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Rob Herring <robh+dt@...nel.org>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Peter Geis <pgwipeout@...il.com>,
        Matt Merhar <mattmerhar@...tonmail.com>
Cc:     linux-tegra@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v1 1/7] PM / devfreq: tegra30: Support thermal cooling

On 5/11/21 6:10 AM, Dmitry Osipenko wrote:
> Expose ACTMON devfreq device as a cooling device in order to throttle
> memory freq on overheat. Throttling of memory freq has a significant
> cooling effect on NVIDIA Tegra SoCs since higher memory freqs require
> higher SoC core voltage which is one of the main causes of the heating.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/devfreq/tegra30-devfreq.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/devfreq/tegra30-devfreq.c b/drivers/devfreq/tegra30-devfreq.c
> index ce83f883ca65..10661eb2aed8 100644
> --- a/drivers/devfreq/tegra30-devfreq.c
> +++ b/drivers/devfreq/tegra30-devfreq.c
> @@ -688,6 +688,7 @@ static struct devfreq_dev_profile tegra_devfreq_profile = {
>  	.polling_ms	= ACTMON_SAMPLING_PERIOD,
>  	.target		= tegra_devfreq_target,
>  	.get_dev_status	= tegra_devfreq_get_dev_status,
> +	.is_cooling_device = true,
>  };
>  
>  static int tegra_governor_get_target(struct devfreq *devfreq,
> 

Applied it. Thanks.

-- 
Best Regards,
Chanwoo Choi
Samsung Electronics