linux-kernel - Re: [PATCH 1/2] soc: imx: gpc: ARM power domain should be always-on

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Message-ID: <1516715256.25726.22.camel@pengutronix.de>
Date:   Tue, 23 Jan 2018 14:47:36 +0100
From:   Lucas Stach <l.stach@...gutronix.de>
To:     Anson Huang <Anson.Huang@....com>, shawnguo@...nel.org,
        kernel@...gutronix.de, fabio.estevam@....com, robh+dt@...nel.org,
        aisheng.dong@....com, mark.rutland@....com, linux@...linux.org.uk
Cc:     devicetree@...r.kernel.org, Linux-imx@....com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] soc: imx: gpc: ARM power domain should be always-on

Am Mittwoch, den 24.01.2018, 00:42 +0800 schrieb Anson Huang:
> ARM power domain does NOT support runtime off, always-on
> flag should be set to avoid incorrect power state in
> pm_genpd_summary:
> 
> Before:
> 
> root@...6qpdlsolox:~# cat /sys/kernel/debug/pm_genpd/pm_genpd_summary
> domain                          status          slaves
>     /device                                             runtime status
> ----------------------------------------------------------------------
> ARM                             off-0
> 
> After:
> 
> root@...6qpdlsolox:~# cat /sys/kernel/debug/pm_genpd/pm_genpd_summary
> domain                          status          slaves
>     /device                                             runtime status
> ----------------------------------------------------------------------
> ARM                             on
> 
> Signed-off-by: Anson Huang <Anson.Huang@....com>

Reviewed-by: Lucas Stach <l.stach@...gutronix.de>

> ---
>  drivers/soc/imx/gpc.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/soc/imx/gpc.c b/drivers/soc/imx/gpc.c
> index 53f7275..6cafa9b 100644
> --- a/drivers/soc/imx/gpc.c
> +++ b/drivers/soc/imx/gpc.c
> @@ -254,6 +254,7 @@ static struct imx_pm_domain imx_gpc_domains[] = {
> >  	{
> >  		.base = {
> >  			.name = "ARM",
> > +			.flags = GENPD_FLAG_ALWAYS_ON,
> >  		},
> >  	}, {
> >  		.base = {