linux-kernel - Re: [RFC 05/19] devfreq: imx8m-ddrc: Change governor to powersave

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Message-ID: <CAA+hA=TE+=uiVi1QGijO9icYwHOwwXYSXTrs=NYKfBjyCq4cTw@mail.gmail.com>
Date:   Tue, 9 Mar 2021 21:40:17 +0800
From:   Dong Aisheng <dongas86@...il.com>
To:     Abel Vesa <abel.vesa@....com>
Cc:     Rob Herring <robh@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Lucas Stach <l.stach@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Georgi Djakov <djakov@...nel.org>,
        Dong Aisheng <aisheng.dong@....com>,
        Peng Fan <peng.fan@....com>,
        Martin Kepplinger <martink@...teo.de>,
        devicetree <devicetree@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        NXP Linux Team <linux-imx@....com>
Subject: Re: [RFC 05/19] devfreq: imx8m-ddrc: Change governor to powersave

On Sat, Feb 20, 2021 at 12:03 AM Abel Vesa <abel.vesa@....com> wrote:
>
> By switching to powersave governor, we allow the imx8m-ddrc to always
> run at minimum rate needed by all the running masters.
>
> Signed-off-by: Abel Vesa <abel.vesa@....com>

Would you please help clarify a bit more why need use powersave by default?

Regards
Aisheng

> ---
>  drivers/devfreq/imx8m-ddrc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/devfreq/imx8m-ddrc.c b/drivers/devfreq/imx8m-ddrc.c
> index bc82d3653bff..3a6c04ba4f2e 100644
> --- a/drivers/devfreq/imx8m-ddrc.c
> +++ b/drivers/devfreq/imx8m-ddrc.c
> @@ -379,7 +379,7 @@ static int imx8m_ddrc_probe(struct platform_device *pdev)
>  {
>         struct device *dev = &pdev->dev;
>         struct imx8m_ddrc *priv;
> -       const char *gov = DEVFREQ_GOV_USERSPACE;
> +       const char *gov = DEVFREQ_GOV_POWERSAVE;
>         int ret;
>
>         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> --
> 2.29.2
>