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Commit a0fd95b3 authored by Hu Ziji's avatar Hu Ziji Committed by Ulf Hansson
Browse files

mmc: sdhci-xenon: Add Xenon SDHCI specific system-level PM support 



Add Xenon specific system-level suspend and resume support.
Especially during resume, re-configure Xenon specific registers
since registers setting will be lost in suspend if Xenon is power off.

Signed-off-by: default avatarHu Ziji <huziji@marvell.com>
Signed-off-by: default avatarZhoujie Wu <zjwu@marvell.com>
Tested-by: default avatarJisheng Zhang <jszhang@marvell.com>
Acked-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 03de1921

drivers/mmc/host/sdhci-xenon.c

+41 −1
Original line number Diff line number Diff line
@@ -518,6 +518,46 @@ static int xenon_remove(struct platform_device *pdev) 
	return 0;

}



#ifdef CONFIG_PM_SLEEP

static int xenon_suspend(struct device *dev)

{

	struct sdhci_host *host = dev_get_drvdata(dev);

	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

	int ret;



	ret = sdhci_suspend_host(host);

	if (ret)

		return ret;



	clk_disable_unprepare(pltfm_host->clk);

	return ret;

}



static int xenon_resume(struct device *dev)

{

	struct sdhci_host *host = dev_get_drvdata(dev);

	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

	int ret;



	ret = clk_prepare_enable(pltfm_host->clk);

	if (ret)

		return ret;



	/*

	 * If SoCs power off the entire Xenon, registers setting will

	 * be lost.

	 * Re-configure Xenon specific register to enable current SDHC

	 */

	ret = xenon_sdhc_prepare(host);

	if (ret)

		return ret;



	return sdhci_resume_host(host);

}

#endif



static SIMPLE_DEV_PM_OPS(xenon_pmops, xenon_suspend, xenon_resume);



static const struct of_device_id sdhci_xenon_dt_ids[] = {

	{ .compatible = "marvell,armada-ap806-sdhci",},

	{ .compatible = "marvell,armada-cp110-sdhci",},
@@ -530,7 +570,7 @@ static struct platform_driver sdhci_xenon_driver = { 
	.driver	= {

		.name	= "xenon-sdhci",

		.of_match_table = sdhci_xenon_dt_ids,

		.pm = &sdhci_pltfm_pmops,

		.pm = &xenon_pmops,

	},

	.probe	= xenon_probe,

	.remove	= xenon_remove,