Patch "hwrng: iproc-rng200 - Implement suspend and resume calls" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    hwrng: iproc-rng200 - Implement suspend and resume calls

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     hwrng-iproc-rng200-implement-suspend-and-resume-call.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 2bdd299c443eb845c0309f1b10aabda6c81c2723
Author: Florian Fainelli <florian.fainelli@xxxxxxxxxxxx>
Date:   Thu Aug 10 12:22:08 2023 -0700

    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: c3577f6100ca ("hwrng: iproc-rng200 - Add support for BCM7278")
    Signed-off-by: Florian Fainelli <florian.fainelli@xxxxxxxxxxxx>
    Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c
index a43743887db19..9142a63b92b30 100644
--- a/drivers/char/hw_random/iproc-rng200.c
+++ b/drivers/char/hw_random/iproc-rng200.c
@@ -189,6 +189,8 @@ 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;
@@ -206,6 +208,28 @@ 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,bcm2711-rng200", },
 	{ .compatible = "brcm,bcm7211-rng200", },
@@ -219,6 +243,7 @@ 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,
 };