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authorClaudiu Beznea <claudiu.beznea@microchip.com>2022-02-21 10:59:27 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2022-03-03 01:46:19 +0300
commitc4f51eab6ce0b7138f375673dbb2789e49b6d028 (patch)
treed5eb0795b19bc3bfad7dc95733162e1394b521ef /drivers/char
parentb953188525973314e32586e45bbd3d4768891c27 (diff)
downloadlinux-c4f51eab6ce0b7138f375673dbb2789e49b6d028.tar.xz
hwrng: atmel - add runtime pm support
Add runtime PM support. Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/hw_random/atmel-rng.c44
1 files 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 = {