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31 lines
1.1 KiB
Diff
31 lines
1.1 KiB
Diff
From c5759d7c254f5e0c360a3ce9172b3972d0f13779 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 023/277] 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 574211a49549..e66c0fca8c60 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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@@ -102,9 +102,10 @@ static int bcm2835_rng_probe(struct platform_device *pdev)
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rng_setup(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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2.16.1
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