Commit ee0f3092 authored by Faiz Abbas's avatar Faiz Abbas Committed by Ulf Hansson
Browse files

mmc: sdhci-omap: Add Support for Suspend/Resume 



Add power management ops which save and restore the driver context and
facilitate a system suspend and resume.

Signed-off-by: default avatarFaiz Abbas <faiz_abbas@ti.com>
Link: https://lore.kernel.org/r/20200305151228.24692-1-faiz_abbas@ti.com


Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent a5d90dc4

drivers/mmc/host/sdhci-omap.c

+57 −0
Original line number Diff line number Diff line
@@ -108,6 +108,11 @@ struct sdhci_omap_host { 
	struct pinctrl		*pinctrl;

	struct pinctrl_state	**pinctrl_state;

	bool			is_tuning;

	/* Omap specific context save */

	u32			con;

	u32			hctl;

	u32			sysctl;

	u32			capa;

};



static void sdhci_omap_start_clock(struct sdhci_omap_host *omap_host);
@@ -1235,12 +1240,64 @@ static int sdhci_omap_remove(struct platform_device *pdev) 


	return 0;

}

#ifdef CONFIG_PM_SLEEP

static void sdhci_omap_context_save(struct sdhci_omap_host *omap_host)

{

	omap_host->con = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);

	omap_host->hctl = sdhci_omap_readl(omap_host, SDHCI_OMAP_HCTL);

	omap_host->capa = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);

}



static void sdhci_omap_context_restore(struct sdhci_omap_host *omap_host)

{

	sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, omap_host->con);

	sdhci_omap_writel(omap_host, SDHCI_OMAP_HCTL, omap_host->hctl);

	sdhci_omap_writel(omap_host, SDHCI_OMAP_CAPA, omap_host->capa);

}



static int __maybe_unused sdhci_omap_suspend(struct device *dev)

{

	struct sdhci_host *host = dev_get_drvdata(dev);

	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

	struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);



	sdhci_suspend_host(host);



	sdhci_omap_context_save(omap_host);



	pinctrl_pm_select_idle_state(dev);



	pm_runtime_force_suspend(dev);



	return 0;

}



static int __maybe_unused sdhci_omap_resume(struct device *dev)

{

	struct sdhci_host *host = dev_get_drvdata(dev);

	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

	struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);



	pm_runtime_force_resume(dev);



	pinctrl_pm_select_default_state(dev);



	sdhci_omap_context_restore(omap_host);



	sdhci_resume_host(host);



	return 0;

}

#endif

static SIMPLE_DEV_PM_OPS(sdhci_omap_dev_pm_ops, sdhci_omap_suspend,

			 sdhci_omap_resume);



static struct platform_driver sdhci_omap_driver = {

	.probe = sdhci_omap_probe,

	.remove = sdhci_omap_remove,

	.driver = {

		   .name = "sdhci-omap",

		   .pm = &sdhci_omap_dev_pm_ops,

		   .of_match_table = omap_sdhci_match,

		  },

};

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