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bcm2835-rng: Avoid initialising if already enabled

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Avoids the 0x40000 cycles of warmup again if firmware has already used it
This commit is contained in:
popcornmix
2016-12-06 17:05:39 +00:00
parent b4f741c2e6
commit f12ce3d87b
1 changed files with 4 additions and 2 deletions
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6
drivers/char/hw_random/bcm2835-rng.c
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@@ -102,8 +102,10 @@ static int bcm2835_rng_init(struct hwrng *rng)
}
/* set warm-up count & enable */
rng_writel(priv, RNG_WARMUP_COUNT, RNG_STATUS);
rng_writel(priv, RNG_RBGEN, RNG_CTRL);
if (!(rng_readl(priv, RNG_CTRL) & RNG_RBGEN)) {
rng_writel(priv, RNG_WARMUP_COUNT, RNG_STATUS);
rng_writel(priv, RNG_RBGEN, RNG_CTRL);
}
return ret;
}