linux-kernel - Re: [PATCH] soc: imx6qp: Use GENPD_FLAG_ALWAYS

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Message-ID: <20180717061439.GH4576@dragon>
Date:   Tue, 17 Jul 2018 14:14:40 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Leonard Crestez <leonard.crestez@....com>
Cc:     Lucas Stach <l.stach@...gutronix.de>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Dong Aisheng <aisheng.dong@....com>,
        Anson Huang <Anson.Huang@....com>, linux-pm@...r.kernel.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        linux-kernel@...r.kernel.org, linux-imx@....com,
        kernel@...gutronix.de, Fabio Estevam <fabio.estevam@....com>,
        Robin Gong <yibin.gong@....com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] soc: imx6qp: Use GENPD_FLAG_ALWAYS_ON for PU errata

On Fri, Jul 13, 2018 at 01:01:15PM +0300, Leonard Crestez wrote:
> This is functionally identical but simpler and slightly faster.
> 
> The PU domain is turned on at boot time and never turned off. In the
> current implementation the pm core will repeatedly call power_off when
> the domain is unused and get -EBUSY back. If the domain is marked as
> "always on" instead the pm core won't even attempt to turn it off.
> 
> In theory on 6qp it is safe to turn PU off in suspend, however that is
> best accomplished with a new core flag.
> 
> Signed-off-by: Leonard Crestez <leonard.crestez@....com>

Applied all, thanks.