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| author | Florian Fainelli <florian.fainelli@broadcom.com> | 2023-08-10 12:22:08 -0700 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2023-08-18 17:01:09 +0800 |
| commit | 8e03dd62e5be811efbf0cbeba47e79e793519105 (patch) | |
| tree | eceb613eca0a61e599de939670dd18573682e387 /drivers/char | |
| parent | d88bdbd96d258ab7973e67b94701c55324e9885f (diff) | |
| download | lwn-8e03dd62e5be811efbf0cbeba47e79e793519105.tar.gz lwn-8e03dd62e5be811efbf0cbeba47e79e793519105.zip | |
hwrng: iproc-rng200 - Implement suspend and resume calls
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>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/hw_random/iproc-rng200.c | 25 |
1 files changed, 25 insertions, 0 deletions
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, }; |