UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

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>
This commit is contained in:
Claudiu Beznea 2022-02-21 09:59:27 +02:00 committed by Herbert Xu
parent b953188525
commit c4f51eab6c
1 changed files with 32 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
drivers/char/hw_random/atmel-rng.c
View File

@ -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
pm_runtime_set_autosuspend_delay(&pdev->dev, 100);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_enable(&pdev->dev);
ret = devm_hwrng_register(&pdev->dev, &trng->rng);
if (ret)
goto err_register;
if (ret) {
pm_runtime_disable(&pdev->dev);
pm_runtime_set_suspended(&pdev->dev);
#ifndef CONFIG_PM
atmel_trng_cleanup(trng);
#endif
}
platform_set_drvdata(pdev, trng);
return 0;
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 = {