linux-kernel - Re: [PATCH] mmc: sdhci-msm: Add pm

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Message-ID: <79066adb-c45b-158f-99af-6d86e6de7513@intel.com>
Date:   Thu, 8 Sep 2016 10:47:54 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Pramod Gurav <pramod.gurav@...aro.org>, ulf.hansson@...aro.org
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ritesh Harjani <riteshh@...eaurora.org>,
        Georgi Djakov <georgi.djakov@...aro.org>,
        Stephen Boyd <sboyd@...eaurora.org>
Subject: Re: [PATCH] mmc: sdhci-msm: Add pm_runtime and system PM support

On 16/06/16 15:35, Pramod Gurav wrote:
> Provides runtime PM callbacks to enable and disable clock resources
> when idle. Also support system PM callbacks to be called during system
> suspend and resume.
> 
> Signed-off-by: Pramod Gurav <pramod.gurav@...aro.org>

Can we get some Tested/Reviewed/Acked-by from people using this driver?

> ---
>  drivers/mmc/host/sdhci-msm.c | 57 ++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 57 insertions(+)
> 
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> index 0653fe7..f4394c8 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -18,6 +18,7 @@
>  #include <linux/of_device.h>
>  #include <linux/delay.h>
>  #include <linux/mmc/mmc.h>
> +#include <linux/pm_runtime.h>
>  #include <linux/slab.h>
>  
>  #include "sdhci-pltfm.h"
> @@ -549,6 +550,11 @@ static int sdhci_msm_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto clk_disable;
>  
> +	platform_set_drvdata(pdev, msm_host);
> +
> +	pm_runtime_set_active(&pdev->dev);
> +	pm_runtime_enable(&pdev->dev);
> +
>  	return 0;
>  
>  clk_disable:
> @@ -580,12 +586,63 @@ static int sdhci_msm_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +static int sdhci_msm_runtime_suspend(struct device *dev)
> +{
> +	struct sdhci_msm_host *msm_host = dev_get_drvdata(dev);
> +
> +	clk_disable_unprepare(msm_host->clk);
> +	clk_disable_unprepare(msm_host->pclk);
> +
> +	return 0;
> +}
> +
> +static int sdhci_msm_runtime_resume(struct device *dev)
> +{
> +	struct sdhci_msm_host *msm_host = dev_get_drvdata(dev);
> +	int ret;
> +
> +	ret = clk_prepare_enable(msm_host->clk);
> +	if (ret) {
> +		dev_err(dev, "clk_enable failed: %d\n", ret);
> +		return ret;
> +	}
> +	ret = clk_prepare_enable(msm_host->pclk);
> +	if (ret) {
> +		dev_err(dev, "clk_enable failed: %d\n", ret);
> +		clk_disable_unprepare(msm_host->clk);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int sdhci_msm_suspend(struct device *dev)
> +{
> +	pm_runtime_force_suspend(dev);
> +
> +	return 0;
> +}
> +
> +static int sdhci_msm_resume(struct device *dev)
> +{
> +	pm_runtime_force_resume(dev);
> +
> +	return 0;
> +}
> +
> +static const struct dev_pm_ops sdhci_msm_pm_ops = {
> +	SET_LATE_SYSTEM_SLEEP_PM_OPS(sdhci_msm_suspend, sdhci_msm_resume)
> +	SET_RUNTIME_PM_OPS(sdhci_msm_runtime_suspend, sdhci_msm_runtime_resume,
> +				NULL)
> +};
> +
>  static struct platform_driver sdhci_msm_driver = {
>  	.probe = sdhci_msm_probe,
>  	.remove = sdhci_msm_remove,
>  	.driver = {
>  		   .name = "sdhci_msm",
>  		   .of_match_table = sdhci_msm_dt_match,
> +		   .pm = &sdhci_msm_pm_ops,
>  	},
>  };
>  
>