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Commit bbce5802 authored by Chaithrika U S's avatar Chaithrika U S Committed by Linus Torvalds
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davinci: mmc: updates to suspend/resume implementation 



Improve the suspend and resume callbacks in DaVinci MMC host controller
driver.  Modify the reset status of the contorller and clock during
suspend and resume.  Also migrate the power management callbacks from
platform driver to dev_pm_ops structure.

Tested on DA850/OMAP-L138 EVM.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: default avatarChaithrika U S <chaithrika@ti.com>
Acked-by: default avatarKevin Hilman <khilman@deeprootsystems.com>
Cc: Vipin Bhandari <vipin.bhandari@ti.com>
Cc: Sudhakar Rajashekhara <sudhakar.raj@ti.com>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 06de845f

drivers/mmc/host/davinci_mmc.c

+43 −8
Original line number Diff line number Diff line
@@ -171,6 +171,7 @@ struct mmc_davinci_host { 
#define DAVINCI_MMC_DATADIR_READ	1

#define DAVINCI_MMC_DATADIR_WRITE	2

	unsigned char data_dir;

	unsigned char suspended;



	/* buffer is used during PIO of one scatterlist segment, and

	 * is updated along with buffer_bytes_left.  bytes_left applies
@@ -1332,32 +1333,66 @@ static int __exit davinci_mmcsd_remove(struct platform_device *pdev) 
}



#ifdef CONFIG_PM

static int davinci_mmcsd_suspend(struct platform_device *pdev, pm_message_t msg)

static int davinci_mmcsd_suspend(struct device *dev)

{

	struct platform_device *pdev = to_platform_device(dev);

	struct mmc_davinci_host *host = platform_get_drvdata(pdev);

	struct pm_message msg = { PM_EVENT_SUSPEND };

	int ret;



	return mmc_suspend_host(host->mmc, msg);

	mmc_host_enable(host->mmc);

	ret = mmc_suspend_host(host->mmc, msg);

	if (!ret) {

		writel(0, host->base + DAVINCI_MMCIM);

		mmc_davinci_reset_ctrl(host, 1);

		mmc_host_disable(host->mmc);

		clk_disable(host->clk);

		host->suspended = 1;

	} else {

		host->suspended = 0;

		mmc_host_disable(host->mmc);

	}



static int davinci_mmcsd_resume(struct platform_device *pdev)

	return ret;

}



static int davinci_mmcsd_resume(struct device *dev)

{

	struct platform_device *pdev = to_platform_device(dev);

	struct mmc_davinci_host *host = platform_get_drvdata(pdev);

	int ret;



	if (!host->suspended)

		return 0;



	clk_enable(host->clk);

	mmc_host_enable(host->mmc);



	return mmc_resume_host(host->mmc);

	mmc_davinci_reset_ctrl(host, 0);

	ret = mmc_resume_host(host->mmc);

	if (!ret)

		host->suspended = 0;



	return ret;

}



static const struct dev_pm_ops davinci_mmcsd_pm = {

	.suspend        = davinci_mmcsd_suspend,

	.resume         = davinci_mmcsd_resume,

};



#define davinci_mmcsd_pm_ops (&davinci_mmcsd_pm)

#else

#define davinci_mmcsd_suspend	NULL

#define davinci_mmcsd_resume	NULL

#define davinci_mmcsd_pm_ops NULL

#endif



static struct platform_driver davinci_mmcsd_driver = {

	.driver		= {

		.name	= "davinci_mmc",

		.owner	= THIS_MODULE,

		.pm	= davinci_mmcsd_pm_ops,

	},

	.remove		= __exit_p(davinci_mmcsd_remove),

	.suspend	= davinci_mmcsd_suspend,

	.resume		= davinci_mmcsd_resume,

};



static int __init davinci_mmcsd_init(void)