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Commit 12bf7d9c authored by Florian Fainelli's avatar Florian Fainelli Committed by Greg Kroah-Hartman
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hwrng: iproc-rng200 - Implement suspend and resume calls 



[ Upstream commit 8e03dd62e5be811efbf0cbeba47e79e793519105 ]

Chips such as BCM7278 support system wide suspend/resume which will
cause the HWRNG block to lose its state and reset to its power on reset
register values. We need to cleanup and re-initialize the HWRNG for it
to be functional coming out of a system suspend cycle.

Fixes: c3577f61 ("hwrng: iproc-rng200 - Add support for BCM7278")
Signed-off-by: default avatarFlorian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 4f1ca8e3

drivers/char/hw_random/iproc-rng200.c

+25 −0
Original line number Diff line number Diff line
@@ -202,6 +202,8 @@ static int iproc_rng200_probe(struct platform_device *pdev) 
		return PTR_ERR(priv->base);

	}



	dev_set_drvdata(dev, priv);



	priv->rng.name = "iproc-rng200";

	priv->rng.read = iproc_rng200_read;

	priv->rng.init = iproc_rng200_init;
@@ -219,6 +221,28 @@ static int iproc_rng200_probe(struct platform_device *pdev) 
	return 0;

}



static int __maybe_unused iproc_rng200_suspend(struct device *dev)

{

	struct iproc_rng200_dev *priv = dev_get_drvdata(dev);



	iproc_rng200_cleanup(&priv->rng);



	return 0;

}



static int __maybe_unused iproc_rng200_resume(struct device *dev)

{

	struct iproc_rng200_dev *priv =  dev_get_drvdata(dev);



	iproc_rng200_init(&priv->rng);



	return 0;

}



static const struct dev_pm_ops iproc_rng200_pm_ops = {

	SET_SYSTEM_SLEEP_PM_OPS(iproc_rng200_suspend, iproc_rng200_resume)

};



static const struct of_device_id iproc_rng200_of_match[] = {

	{ .compatible = "brcm,bcm7211-rng200", },

	{ .compatible = "brcm,bcm7278-rng200", },
@@ -231,6 +255,7 @@ static struct platform_driver iproc_rng200_driver = { 
	.driver = {

		.name		= "iproc-rng200",

		.of_match_table = iproc_rng200_of_match,

		.pm		= &iproc_rng200_pm_ops,

	},

	.probe		= iproc_rng200_probe,

};