diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-4.19/950-0020-bcm2835-rng-Avoid-initialising-if-already-enabled.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-4.19/950-0020-bcm2835-rng-Avoid-initialising-if-already-enabled.patch | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-4.19/950-0020-bcm2835-rng-Avoid-initialising-if-already-enabled.patch b/target/linux/bcm27xx/patches-4.19/950-0020-bcm2835-rng-Avoid-initialising-if-already-enabled.patch new file mode 100644 index 0000000000..30ab0504ae --- /dev/null +++ b/target/linux/bcm27xx/patches-4.19/950-0020-bcm2835-rng-Avoid-initialising-if-already-enabled.patch @@ -0,0 +1,25 @@ +From d5df60f32f3c3b2f7f6d758ac08de6acb9fd947f 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 | 6 ++++-- + 1 file changed, 4 insertions(+), 2 deletions(-) + +--- a/drivers/char/hw_random/bcm2835-rng.c ++++ b/drivers/char/hw_random/bcm2835-rng.c +@@ -105,8 +105,10 @@ static int bcm2835_rng_init(struct hwrng + } + + /* 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; + } |