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Subject[PATCH 6/7] hwrnd: atmel - add runtime pm support
Date
Add runtime PM support.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
---
drivers/char/hw_random/atmel-rng.c | 44 ++++++++++++++++++++++--------
1 file changed, 32 insertions(+), 12 deletions(-)

diff --git a/drivers/char/hw_random/atmel-rng.c b/drivers/char/hw_random/atmel-rng.c
index 0fff74808472..b662d44a09a6 100644
--- a/drivers/char/hw_random/atmel-rng.c
+++ b/drivers/char/hw_random/atmel-rng.c
@@ -17,6 +17,7 @@
#include <linux/hw_random.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>

#define TRNG_CR 0x00
#define TRNG_MR 0x04
@@ -58,6 +59,12 @@ static int atmel_trng_read(struct hwrng *rng, void *buf, size_t max,
u32 *data = buf;
int ret;

+ ret = pm_runtime_get_sync((struct device *)trng->rng.priv);
+ if (ret < 0) {
+ pm_runtime_put_sync((struct device *)trng->rng.priv);
+ return ret;
+ }
+
ret = atmel_trng_wait_ready(trng, wait);
if (!ret)
goto out;
@@ -72,6 +79,8 @@ static int atmel_trng_read(struct hwrng *rng, void *buf, size_t max,
ret = 4;

out:
+ pm_runtime_mark_last_busy((struct device *)trng->rng.priv);
+ pm_runtime_put_sync_autosuspend((struct device *)trng->rng.priv);
return ret;
}

@@ -127,21 +136,28 @@ static int atmel_trng_probe(struct platform_device *pdev)
trng->has_half_rate = data->has_half_rate;
trng->rng.name = pdev->name;
trng->rng.read = atmel_trng_read;
+ trng->rng.priv = (unsigned long)&pdev->dev;
+ platform_set_drvdata(pdev, trng);

+#ifndef CONFIG_PM
ret = atmel_trng_init(trng);
if (ret)
return ret;
+#endif

- ret = devm_hwrng_register(&pdev->dev, &trng->rng);
- if (ret)
- goto err_register;
-
- platform_set_drvdata(pdev, trng);
+ pm_runtime_set_autosuspend_delay(&pdev->dev, 100);
+ pm_runtime_use_autosuspend(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);

- return 0;
+ ret = devm_hwrng_register(&pdev->dev, &trng->rng);
+ if (ret) {
+ pm_runtime_disable(&pdev->dev);
+ pm_runtime_set_suspended(&pdev->dev);
+#ifndef CONFIG_PM
+ atmel_trng_cleanup(trng);
+#endif
+ }

-err_register:
- atmel_trng_cleanup(trng);
return ret;
}

@@ -151,11 +167,13 @@ static int atmel_trng_remove(struct platform_device *pdev)


atmel_trng_cleanup(trng);
+ pm_runtime_disable(&pdev->dev);
+ pm_runtime_set_suspended(&pdev->dev);

return 0;
}

-static int __maybe_unused atmel_trng_suspend(struct device *dev)
+static int __maybe_unused atmel_trng_runtime_suspend(struct device *dev)
{
struct atmel_trng *trng = dev_get_drvdata(dev);

@@ -164,7 +182,7 @@ static int __maybe_unused atmel_trng_suspend(struct device *dev)
return 0;
}

-static int __maybe_unused atmel_trng_resume(struct device *dev)
+static int __maybe_unused atmel_trng_runtime_resume(struct device *dev)
{
struct atmel_trng *trng = dev_get_drvdata(dev);

@@ -172,8 +190,10 @@ static int __maybe_unused atmel_trng_resume(struct device *dev)
}

static const struct dev_pm_ops __maybe_unused atmel_trng_pm_ops = {
- .suspend = atmel_trng_suspend,
- .resume = atmel_trng_resume,
+ SET_RUNTIME_PM_OPS(atmel_trng_runtime_suspend,
+ atmel_trng_runtime_resume, NULL)
+ SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+ pm_runtime_force_resume)
};

static const struct atmel_trng_data at91sam9g45_config = {
--
2.32.0
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