2019-09-19 14:43:19 +00:00
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From d5df60f32f3c3b2f7f6d758ac08de6acb9fd947f Mon Sep 17 00:00:00 2001
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2019-07-09 18:32:28 +00:00
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From: popcornmix <popcornmix@gmail.com>
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Date: Tue, 6 Dec 2016 17:05:39 +0000
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2019-12-23 12:42:55 +00:00
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Subject: [PATCH] bcm2835-rng: Avoid initialising if already enabled
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2019-07-09 18:32:28 +00:00
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Avoids the 0x40000 cycles of warmup again if firmware has already used it
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---
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drivers/char/hw_random/bcm2835-rng.c | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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--- a/drivers/char/hw_random/bcm2835-rng.c
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+++ b/drivers/char/hw_random/bcm2835-rng.c
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@@ -105,8 +105,10 @@ static int bcm2835_rng_init(struct hwrng
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}
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/* set warm-up count & enable */
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- rng_writel(priv, RNG_WARMUP_COUNT, RNG_STATUS);
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- rng_writel(priv, RNG_RBGEN, RNG_CTRL);
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+ if (!(rng_readl(priv, RNG_CTRL) & RNG_RBGEN)) {
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+ rng_writel(priv, RNG_WARMUP_COUNT, RNG_STATUS);
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+ rng_writel(priv, RNG_RBGEN, RNG_CTRL);
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+ }
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return ret;
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}
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