Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753152AbbKJOEB (ORCPT ); Tue, 10 Nov 2015 09:04:01 -0500 Received: from mail-yk0-f180.google.com ([209.85.160.180]:34053 "EHLO mail-yk0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752323AbbKJOD6 (ORCPT ); Tue, 10 Nov 2015 09:03:58 -0500 MIME-Version: 1.0 In-Reply-To: <1447161830-27205-1-git-send-email-ludovic.desroches@atmel.com> References: <1447161830-27205-1-git-send-email-ludovic.desroches@atmel.com> Date: Tue, 10 Nov 2015 15:03:57 +0100 Message-ID: Subject: Re: [PATCH v3] mmc: sdhci at91: add PM support From: Ulf Hansson To: Ludovic Desroches Cc: linux-mmc , "linux-kernel@vger.kernel.org" , Nicolas Ferre , "linux-arm-kernel@lists.infradead.org" Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4513 Lines: 138 On 10 November 2015 at 14:23, Ludovic Desroches wrote: > Add runtime PM support and use runtime_force_suspend|resume() for system > PM. > > Signed-off-by: Ludovic Desroches > --- > > Changes: > - from v2: cleanup thanks to Ulf feedback > - from v1: take a runtime PM centric approach > > drivers/mmc/host/sdhci-of-at91.c | 67 +++++++++++++++++++++++++++++++++++++++- > 1 file changed, 66 insertions(+), 1 deletion(-) > > diff --git a/drivers/mmc/host/sdhci-of-at91.c b/drivers/mmc/host/sdhci-of-at91.c > index 06d0b50..bbac18e 100644 > --- a/drivers/mmc/host/sdhci-of-at91.c > +++ b/drivers/mmc/host/sdhci-of-at91.c > @@ -21,6 +21,8 @@ > #include > #include > #include > +#include > +#include > > #include "sdhci-pltfm.h" > > @@ -51,6 +53,60 @@ static const struct of_device_id sdhci_at91_dt_match[] = { > {} > }; > > +#ifdef CONFIG_PM > +static int sdhci_at91_runtime_suspend(struct device *dev) > +{ > + struct sdhci_host *host = dev_get_drvdata(dev); > + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); > + struct sdhci_at91_priv *priv = pltfm_host->priv; > + int ret; > + > + ret = sdhci_runtime_suspend_host(host); > + > + clk_disable_unprepare(priv->gck); > + clk_disable_unprepare(priv->hclock); > + clk_disable_unprepare(priv->mainck); > + > + return ret; > +} > + > +static int sdhci_at91_runtime_resume(struct device *dev) > +{ > + struct sdhci_host *host = dev_get_drvdata(dev); > + 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_runtime_resume_host(host); > +} > +#endif /* CONFIG_PM */ > + > +static const struct dev_pm_ops sdhci_at91_dev_pm_ops = { > + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, > + pm_runtime_force_resume) > + SET_RUNTIME_PM_OPS(sdhci_at91_runtime_suspend, > + sdhci_at91_runtime_resume, > + NULL) > +}; > + > static int sdhci_at91_probe(struct platform_device *pdev) > { > const struct of_device_id *match; > @@ -144,6 +200,11 @@ static int sdhci_at91_probe(struct platform_device *pdev) > > sdhci_get_of_property(pdev); > > + 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); > + > ret = sdhci_add_host(host); > if (ret) > goto clocks_disable_unprepare; You need to add error handling of runtime PM after this point. Typically: pm_runtime_disable() and pm_runtime_set_suspended() needs to be done. > @@ -165,6 +226,10 @@ 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; > > + pm_runtime_get_sync(&pdev->dev); > + pm_runtime_disable(&pdev->dev); > + pm_runtime_put_noidle(&pdev->dev); > + > sdhci_pltfm_unregister(pdev); > > clk_disable_unprepare(priv->gck); > @@ -178,7 +243,7 @@ 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 > Kind regards Uffe -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/