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Commit 89d7e5c1 authored by Dong Aisheng's avatar Dong Aisheng Committed by Chris Ball
Browse files

mmc: sdhci-esdhc-imx: add runtime pm support 



The root clock will be disabled in runtime pm to save power.

Signed-off-by: default avatarDong Aisheng <b29396@freescale.com>
Acked-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: default avatarChris Ball <cjb@laptop.org>
parent ce090a4e

drivers/mmc/host/sdhci-esdhc-imx.c

+48 −1
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ 
#include <linux/of_gpio.h>

#include <linux/pinctrl/consumer.h>

#include <linux/platform_data/mmc-esdhc-imx.h>

#include <linux/pm_runtime.h>

#include "sdhci-pltfm.h"

#include "sdhci-esdhc.h"
@@ -1121,6 +1122,12 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev) 
	if (err)

		goto disable_clk;



	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);

	pm_suspend_ignore_children(&pdev->dev, 1);



	return 0;



disable_clk:
@@ -1141,6 +1148,9 @@ static int sdhci_esdhc_imx_remove(struct platform_device *pdev) 


	sdhci_remove_host(host, dead);



	pm_runtime_dont_use_autosuspend(&pdev->dev);

	pm_runtime_disable(&pdev->dev);



	clk_disable_unprepare(imx_data->clk_per);

	clk_disable_unprepare(imx_data->clk_ipg);

	clk_disable_unprepare(imx_data->clk_ahb);
@@ -1150,12 +1160,49 @@ static int sdhci_esdhc_imx_remove(struct platform_device *pdev) 
	return 0;

}



#ifdef CONFIG_PM_RUNTIME

static int sdhci_esdhc_runtime_suspend(struct device *dev)

{

	struct sdhci_host *host = dev_get_drvdata(dev);

	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

	struct pltfm_imx_data *imx_data = pltfm_host->priv;

	int ret;



	ret = sdhci_runtime_suspend_host(host);



	clk_disable_unprepare(imx_data->clk_per);

	clk_disable_unprepare(imx_data->clk_ipg);

	clk_disable_unprepare(imx_data->clk_ahb);



	return ret;

}



static int sdhci_esdhc_runtime_resume(struct device *dev)

{

	struct sdhci_host *host = dev_get_drvdata(dev);

	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

	struct pltfm_imx_data *imx_data = pltfm_host->priv;



	clk_prepare_enable(imx_data->clk_per);

	clk_prepare_enable(imx_data->clk_ipg);

	clk_prepare_enable(imx_data->clk_ahb);



	return sdhci_runtime_resume_host(host);

}

#endif



static const struct dev_pm_ops sdhci_esdhc_pmops = {

	SET_SYSTEM_SLEEP_PM_OPS(sdhci_pltfm_suspend, sdhci_pltfm_resume)

	SET_RUNTIME_PM_OPS(sdhci_esdhc_runtime_suspend,

				sdhci_esdhc_runtime_resume, NULL)

};



static struct platform_driver sdhci_esdhc_imx_driver = {

	.driver		= {

		.name	= "sdhci-esdhc-imx",

		.owner	= THIS_MODULE,

		.of_match_table = imx_esdhc_dt_ids,

		.pm	= SDHCI_PLTFM_PMOPS,

		.pm	= &sdhci_esdhc_pmops,

	},

	.id_table	= imx_esdhc_devtype,

	.probe		= sdhci_esdhc_imx_probe,