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Right now all brcm2708 patches are extracted from the non-mainline raspberrypi/linux git tree. Many of them are hacks and/or are unneeded in LEDE. Raspberry Pi is getting better and better mainline support so it would be nice to finally start maintaining patches in a cleaner way: 1) Backport patches accepted in upstream tree 2) Start using upstream drivers 3) Pick only these patches that are needed for more complete support Handling above tasks requires grouping patches - ideally using the same prefixes as generic ones. It means we should rename existing patches to use some high prefix. This will allow e.g. use 0xx for backported code. Signed-off-by: Rafał Miłecki <rafal@milecki.pl> Acked-by: Florian Fainelli <f.fainelli@gmail.com> Acked-by: Stijn Tintel <stijn@linux-ipv6.be>
27 lines
958 B
Diff
27 lines
958 B
Diff
From ecba31015228961644ad8e17bcf132eea9c7a7f3 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] 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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--- 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 plat
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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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