diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0561-bcm2835-rng-Avoid-initialising-if-already-enabled.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0561-bcm2835-rng-Avoid-initialising-if-already-enabled.patch | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0561-bcm2835-rng-Avoid-initialising-if-already-enabled.patch b/target/linux/brcm2708/patches-4.4/0561-bcm2835-rng-Avoid-initialising-if-already-enabled.patch new file mode 100644 index 0000000000..2892aea656 --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0561-bcm2835-rng-Avoid-initialising-if-already-enabled.patch @@ -0,0 +1,31 @@ +From b7791eea502e0d98ae204750aff2abafc431fb11 Mon Sep 17 00:00:00 2001 +From: popcornmix <popcornmix@gmail.com> +Date: Tue, 6 Dec 2016 17:05:39 +0000 +Subject: [PATCH] bcm2835-rng: Avoid initialising if already enabled + +Avoids the 0x40000 cycles of warmup again if firmware has already used it +--- + drivers/char/hw_random/bcm2835-rng.c | 7 ++++--- + 1 file changed, 4 insertions(+), 3 deletions(-) + +diff --git a/drivers/char/hw_random/bcm2835-rng.c b/drivers/char/hw_random/bcm2835-rng.c +index 7192ec2..2ff49c1 100644 +--- a/drivers/char/hw_random/bcm2835-rng.c ++++ b/drivers/char/hw_random/bcm2835-rng.c +@@ -62,9 +62,10 @@ static int bcm2835_rng_probe(struct platform_device *pdev) + bcm2835_rng_ops.priv = (unsigned long)rng_base; + + /* set warm-up count & enable */ +- __raw_writel(RNG_WARMUP_COUNT, rng_base + RNG_STATUS); +- __raw_writel(RNG_RBGEN, rng_base + RNG_CTRL); +- ++ if (!(__raw_readl(rng_base + RNG_CTRL) & RNG_RBGEN)) { ++ __raw_writel(RNG_WARMUP_COUNT, rng_base + RNG_STATUS); ++ __raw_writel(RNG_RBGEN, rng_base + RNG_CTRL); ++ } + /* register driver */ + err = hwrng_register(&bcm2835_rng_ops); + if (err) { +-- +2.1.4 + |