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32 lines
1.1 KiB
Diff
32 lines
1.1 KiB
Diff
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From b7791eea502e0d98ae204750aff2abafc431fb11 Mon Sep 17 00:00:00 2001
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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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Subject: [PATCH] bcm2835-rng: Avoid initialising if already enabled
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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 | 7 ++++---
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1 file changed, 4 insertions(+), 3 deletions(-)
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diff --git a/drivers/char/hw_random/bcm2835-rng.c b/drivers/char/hw_random/bcm2835-rng.c
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index 7192ec2..2ff49c1 100644
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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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@@ -62,9 +62,10 @@ static int bcm2835_rng_probe(struct platform_device *pdev)
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bcm2835_rng_ops.priv = (unsigned long)rng_base;
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/* set warm-up count & enable */
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- __raw_writel(RNG_WARMUP_COUNT, rng_base + RNG_STATUS);
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- __raw_writel(RNG_RBGEN, rng_base + RNG_CTRL);
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-
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+ if (!(__raw_readl(rng_base + RNG_CTRL) & RNG_RBGEN)) {
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+ __raw_writel(RNG_WARMUP_COUNT, rng_base + RNG_STATUS);
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+ __raw_writel(RNG_RBGEN, rng_base + RNG_CTRL);
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+ }
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/* register driver */
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err = hwrng_register(&bcm2835_rng_ops);
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if (err) {
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--
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2.1.4
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