diff options
| author | Álvaro Fernández Rojas <noltari@gmail.com> | 2022-05-16 23:40:32 +0200 |
|---|---|---|
| committer | Álvaro Fernández Rojas <noltari@gmail.com> | 2022-05-17 15:11:22 +0200 |
| commit | 20ea6adbf199097c4f5f591ffee088340630dae4 (patch) | |
| tree | d6719d95e136611a1c25bbf7789652d6d402779d /target/linux/bcm27xx/patches-5.15/950-0047-bcm2835-rng-Avoid-initialising-if-already-enabled.patch | |
| parent | bca05bd072180dc38ef740b37ded9572a6db1981 (diff) | |
| download | upstream-20ea6adbf199097c4f5f591ffee088340630dae4.tar.gz upstream-20ea6adbf199097c4f5f591ffee088340630dae4.tar.bz2 upstream-20ea6adbf199097c4f5f591ffee088340630dae4.zip | |
bcm27xx: add support for linux v5.15
Build system: x86_64
Build-tested: bcm2708, bcm2709, bcm2710, bcm2711
Run-tested: bcm2708/RPiB+, bcm2709/RPi3B, bcm2710/RPi3B, bcm2711/RPi4B
Signed-off-by: Marty Jones <mj8263788@gmail.com>
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Diffstat (limited to 'target/linux/bcm27xx/patches-5.15/950-0047-bcm2835-rng-Avoid-initialising-if-already-enabled.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.15/950-0047-bcm2835-rng-Avoid-initialising-if-already-enabled.patch | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.15/950-0047-bcm2835-rng-Avoid-initialising-if-already-enabled.patch b/target/linux/bcm27xx/patches-5.15/950-0047-bcm2835-rng-Avoid-initialising-if-already-enabled.patch new file mode 100644 index 0000000000..962667eee4 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.15/950-0047-bcm2835-rng-Avoid-initialising-if-already-enabled.patch @@ -0,0 +1,25 @@ +From d7e520c88cb8e7025c93c809350794711fc94f52 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 +@@ -106,8 +106,10 @@ 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; + } |