mirror of
https://github.com/Ysurac/openmptcprouter.git
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65 lines
1.9 KiB
Diff
65 lines
1.9 KiB
Diff
From 383072a0b4f9f2c8ec0752788e9bf7f79c86368e Mon Sep 17 00:00:00 2001
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From: Dom Cobley <popcornmix@gmail.com>
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Date: Tue, 21 Nov 2023 12:55:03 +0000
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Subject: [PATCH 0733/1002] Revert "hwrng: bcm2835 - sleep more intelligently"
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This reverts commit 6a825ed68f75bd768e31110ba825b75c5c09cf2d.
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---
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drivers/char/hw_random/bcm2835-rng.c | 20 ++++++--------------
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1 file changed, 6 insertions(+), 14 deletions(-)
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diff --git a/drivers/char/hw_random/bcm2835-rng.c b/drivers/char/hw_random/bcm2835-rng.c
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index 84c964b63324..d31ef43b9530 100644
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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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@@ -13,7 +13,6 @@
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#include <linux/printk.h>
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#include <linux/clk.h>
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#include <linux/reset.h>
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-#include <linux/delay.h>
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#define RNG_CTRL 0x0
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#define RNG_STATUS 0x4
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@@ -28,9 +27,6 @@
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#define RNG_INT_OFF 0x1
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-#define RNG_FIFO_WORDS 4
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-#define RNG_US_PER_WORD 34 /* Tuned for throughput */
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-
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struct bcm2835_rng_priv {
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struct hwrng rng;
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void __iomem *base;
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@@ -67,23 +63,19 @@ static inline void rng_writel(struct bcm2835_rng_priv *priv, u32 val,
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static int bcm2835_rng_read(struct hwrng *rng, void *buf, size_t max,
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bool wait)
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{
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- u32 retries = 1000000/(RNG_FIFO_WORDS * RNG_US_PER_WORD);
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struct bcm2835_rng_priv *priv = to_rng_priv(rng);
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u32 max_words = max / sizeof(u32);
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u32 num_words, count;
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- num_words = rng_readl(priv, RNG_STATUS) >> 24;
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-
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- while (!num_words) {
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- if (!wait || !retries)
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+ while ((rng_readl(priv, RNG_STATUS) >> 24) == 0) {
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+ if (!wait)
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return 0;
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- retries--;
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- usleep_range((u32)RNG_US_PER_WORD,
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- (u32)RNG_US_PER_WORD * RNG_FIFO_WORDS);
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- num_words = rng_readl(priv, RNG_STATUS) >> 24;
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+ hwrng_msleep(rng, 1000);
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}
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- num_words = min(num_words, max_words);
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+ num_words = rng_readl(priv, RNG_STATUS) >> 24;
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+ if (num_words > max_words)
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+ num_words = max_words;
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for (count = 0; count < num_words; count++)
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((u32 *)buf)[count] = rng_readl(priv, RNG_DATA);
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--
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2.44.0
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