From 8e03dd62e5be811efbf0cbeba47e79e793519105 Mon Sep 17 00:00:00 2001
From: Florian Fainelli <florian.fainelli@broadcom.com>
Date: Thu, 10 Aug 2023 12:22:08 -0700
Subject: [PATCH] hwrng: iproc-rng200 - Implement suspend and resume calls
Git-commit: 8e03dd62e5be811efbf0cbeba47e79e793519105
Patch-mainline: v6.6-rc1
References: git-fixes
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@broadcom.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/char/hw_random/iproc-rng200.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c
index 34df3f0d3e45..440fe28bddc0 100644
--- a/drivers/char/hw_random/iproc-rng200.c
+++ b/drivers/char/hw_random/iproc-rng200.c
@@ -181,6 +181,8 @@ 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;
@@ -198,6 +200,28 @@ 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", },
@@ -211,6 +235,7 @@ 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,
};
--
2.35.3