You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
26 lines
840 B
Diff
26 lines
840 B
Diff
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;
|
|
}
|