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hwrng: exynos - Runtime suspend device after init

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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 <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
This commit is contained in:
Krzysztof Kozlowski 2016-03-14 09:07:12 +09:00 • committed by Herbert Xu
commit f0d947ac01
1 changed files with 2 additions and 1 deletions
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3
drivers/char/hw_random/exynos-rng.c
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@ -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;
}