Commit bccce2ec authored by Jisheng Zhang's avatar Jisheng Zhang Committed by Ulf Hansson
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mmc: sdhci-of-dwcmshc: add suspend/resume support 



Add dwcmshc specific system-level suspend and resume support.

Signed-off-by: default avatarJisheng Zhang <Jisheng.Zhang@synaptics.com>
Link: https://lore.kernel.org/r/20200515141926.52e088fe@xhacker.debian


Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 554232e8

drivers/mmc/host/sdhci-of-dwcmshc.c

+43 −0
Original line number Diff line number Diff line
@@ -163,6 +163,48 @@ static int dwcmshc_remove(struct platform_device *pdev) 
	return 0;

}



#ifdef CONFIG_PM_SLEEP

static int dwcmshc_suspend(struct device *dev)

{

	struct sdhci_host *host = dev_get_drvdata(dev);

	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);

	int ret;



	ret = sdhci_suspend_host(host);

	if (ret)

		return ret;



	clk_disable_unprepare(pltfm_host->clk);

	if (!IS_ERR(priv->bus_clk))

		clk_disable_unprepare(priv->bus_clk);



	return ret;

}



static int dwcmshc_resume(struct device *dev)

{

	struct sdhci_host *host = dev_get_drvdata(dev);

	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);

	int ret;



	ret = clk_prepare_enable(pltfm_host->clk);

	if (ret)

		return ret;



	if (!IS_ERR(priv->bus_clk)) {

		ret = clk_prepare_enable(priv->bus_clk);

		if (ret)

			return ret;

	}



	return sdhci_resume_host(host);

}

#endif



static SIMPLE_DEV_PM_OPS(dwcmshc_pmops, dwcmshc_suspend, dwcmshc_resume);



static const struct of_device_id sdhci_dwcmshc_dt_ids[] = {

	{ .compatible = "snps,dwcmshc-sdhci" },

	{}
@@ -173,6 +215,7 @@ static struct platform_driver sdhci_dwcmshc_driver = { 
	.driver	= {

		.name	= "sdhci-dwcmshc",

		.of_match_table = sdhci_dwcmshc_dt_ids,

		.pm = &dwcmshc_pmops,

	},

	.probe	= dwcmshc_probe,

	.remove	= dwcmshc_remove,

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