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authorKrzysztof Kozlowski <k.kozlowski@samsung.com>2016-03-14 03:07:12 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2016-04-05 15:35:42 +0300
commitf0d947ac01632fa6c75cb07262922a93736385c1 (patch)
tree1a9416c44fb8905ea243dc123212f0ce7e7fdfb0 /drivers/char
parent97ee7ed394f9f277f492026b9a0708cd92e6ef7d (diff)
downloadlinux-f0d947ac01632fa6c75cb07262922a93736385c1.tar.xz
hwrng: exynos - Runtime suspend device after init
The driver uses pm_runtime_put_noidle() after initialization so the device might remain in active state if the core does not read from it (the read callback contains regular runtime put). The put_noidle() was chosen probably to avoid unneeded suspend and resume cycle after the initialization. However for this purpose autosuspend is enabled so it is safe to runtime put just after the initialization. Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/hw_random/exynos-rng.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/char/hw_random/exynos-rng.c b/drivers/char/hw_random/exynos-rng.c
index ada081232528..d1fd21e99368 100644
--- a/drivers/char/hw_random/exynos-rng.c
+++ b/drivers/char/hw_random/exynos-rng.c
@@ -77,7 +77,8 @@ static int exynos_init(struct hwrng *rng)
pm_runtime_get_sync(exynos_rng->dev);
ret = exynos_rng_configure(exynos_rng);
- pm_runtime_put_noidle(exynos_rng->dev);
+ pm_runtime_mark_last_busy(exynos_rng->dev);
+ pm_runtime_put_autosuspend(exynos_rng->dev);
return ret;
}