linux-kernel - Re: [PATCH v2] mmc: sdhci at91: add PM support

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Date:	Thu, 26 Nov 2015 17:07:18 +0100
From:	Ludovic Desroches <ludovic.desroches@...el.com>
To:	Ulf Hansson <ulf.hansson@...aro.org>
CC:	Ludovic Desroches <ludovic.desroches@...el.com>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2] mmc: sdhci at91: add PM support

On Tue, Nov 10, 2015 at 12:12:30PM +0100, Ulf Hansson wrote:
> On 10 November 2015 at 11:36, Ludovic Desroches
> <ludovic.desroches@...el.com> wrote:
> > Add runtime PM support and use runtime_force_suspend|resume() for system
> > PM.
> >

[...]

> >  static int sdhci_at91_probe(struct platform_device *pdev)
> >  {
> >         const struct of_device_id       *match;
> > @@ -148,6 +206,11 @@ static int sdhci_at91_probe(struct platform_device *pdev)
> >         if (ret)
> >                 goto clocks_disable_unprepare;
> >
> > +       pm_runtime_set_active(&pdev->dev);
> > +       pm_runtime_enable(&pdev->dev);
> > +       pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
> > +       pm_runtime_use_autosuspend(&pdev->dev);
> 
> Move these four runtime PM calls above sdhci_add_host(), as after that
> point the host is used and thus runtime PM operations starts.

Sadly I have discovered a bit late it is not working when doing this
because the controller has been suspended before doing the
sdhci_add_host().

What is the right way to fix it? Calling pm_runtime_get_noresume()
before sdhci_add_host() and calling pm_runtime_put_autosuspend() after?

> 
> > +
> >         return 0;
> >
> >  clocks_disable_unprepare:
> > @@ -165,6 +228,7 @@ static int sdhci_at91_remove(struct platform_device *pdev)
> >         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> >         struct sdhci_at91_priv  *priv = pltfm_host->priv;
> >

Regards

Ludovic
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