linux-kernel - Re: [PATCH] mmc: sdhci at91: add suspend/resume

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Date:	Mon, 19 Oct 2015 10:58:41 +0200
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>
Subject: Re: [PATCH] mmc: sdhci at91: add suspend/resume

On Fri, Oct 16, 2015 at 06:33:44PM +0200, Ulf Hansson wrote:
> On 16 October 2015 at 17:01, Ludovic Desroches
> <ludovic.desroches@...el.com> wrote:
> > Add suspend and resume PM ops.
> >
> > Signed-off-by: Ludovic Desroches <ludovic.desroches@...el.com>
> 
> I have no problem with this patch, nice and easy.
> 
> Although it would be interesting to see how runtime PM would be
> supported for this driver and device. What I have in mind is whether
> we can take a runtime PM centric approach and thus more or less get
> system PM for "free" via the pm_runtime_force_suspend|resume()
> helpers. Care to have a look?
> 

Ok, I'll send a new patch.

Regards

Ludovic

> Kind regards
> Uffe
> 
> > ---
> >  drivers/mmc/host/sdhci-of-at91.c | 55 +++++++++++++++++++++++++++++++++++++++-
> >  1 file changed, 54 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/mmc/host/sdhci-of-at91.c b/drivers/mmc/host/sdhci-of-at91.c
> > index 06d0b50..b9751f2 100644
> > --- a/drivers/mmc/host/sdhci-of-at91.c
> > +++ b/drivers/mmc/host/sdhci-of-at91.c
> > @@ -51,6 +51,59 @@ static const struct of_device_id sdhci_at91_dt_match[] = {
> >         {}
> >  };
> >
> > +#ifdef CONFIG_PM_SLEEP
> > +static int sdhci_at91_suspend(struct device *dev)
> > +{
> > +       struct platform_device *pdev = to_platform_device(dev);
> > +       struct sdhci_host *host = platform_get_drvdata(pdev);
> > +       struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> > +       struct sdhci_at91_priv *priv = pltfm_host->priv;
> > +       int ret;
> > +
> > +       ret = sdhci_suspend_host(host);
> > +       if (ret)
> > +               return ret;
> > +
> > +       clk_disable_unprepare(priv->gck);
> > +       clk_disable_unprepare(priv->hclock);
> > +       clk_disable_unprepare(priv->mainck);
> > +
> > +       return 0;
> > +}
> > +
> > +static int sdhci_at91_resume(struct device *dev)
> > +{
> > +       struct platform_device *pdev = to_platform_device(dev);
> > +       struct sdhci_host *host = platform_get_drvdata(pdev);
> > +       struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> > +       struct sdhci_at91_priv *priv = pltfm_host->priv;
> > +       int ret;
> > +
> > +       ret = clk_prepare_enable(priv->mainck);
> > +       if (ret) {
> > +               dev_err(dev, "can't enable mainck\n");
> > +               return ret;
> > +       }
> > +
> > +       ret = clk_prepare_enable(priv->hclock);
> > +       if (ret) {
> > +               dev_err(dev, "can't enable hclock\n");
> > +               return ret;
> > +       }
> > +
> > +       ret = clk_prepare_enable(priv->gck);
> > +       if (ret) {
> > +               dev_err(dev, "can't enable gck\n");
> > +               return ret;
> > +       }
> > +
> > +       return sdhci_resume_host(host);
> > +}
> > +#endif /* CONFIG_PM_SLEEP */
> > +
> > +static SIMPLE_DEV_PM_OPS(sdhci_at91_dev_pm_ops, sdhci_at91_suspend,
> > +                        sdhci_at91_resume);
> > +
> >  static int sdhci_at91_probe(struct platform_device *pdev)
> >  {
> >         const struct of_device_id       *match;
> > @@ -178,7 +231,7 @@ static struct platform_driver sdhci_at91_driver = {
> >         .driver         = {
> >                 .name   = "sdhci-at91",
> >                 .of_match_table = sdhci_at91_dt_match,
> > -               .pm     = SDHCI_PLTFM_PMOPS,
> > +               .pm     = &sdhci_at91_dev_pm_ops,
> >         },
> >         .probe          = sdhci_at91_probe,
> >         .remove         = sdhci_at91_remove,
> > --
> > 2.5.0
> >
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