[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20180528100338.807420884@linuxfoundation.org>
Date: Mon, 28 May 2018 12:03:54 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Lionel Debieve <lionel.debieve@...com>,
Herbert Xu <herbert@...dor.apana.org.au>,
Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 449/496] hwrng: stm32 - add reset during probe
4.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: "lionel.debieve@...com" <lionel.debieve@...com>
[ Upstream commit 326ed382256475aa4b8b7eae8a2f60689fd25e78 ]
Avoid issue when probing the RNG without
reset if bad status has been detected previously
Signed-off-by: Lionel Debieve <lionel.debieve@...com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/char/hw_random/stm32-rng.c | 9 +++++++++
1 file changed, 9 insertions(+)
--- a/drivers/char/hw_random/stm32-rng.c
+++ b/drivers/char/hw_random/stm32-rng.c
@@ -21,6 +21,7 @@
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/pm_runtime.h>
+#include <linux/reset.h>
#include <linux/slab.h>
#define RNG_CR 0x00
@@ -46,6 +47,7 @@ struct stm32_rng_private {
struct hwrng rng;
void __iomem *base;
struct clk *clk;
+ struct reset_control *rst;
};
static int stm32_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
@@ -140,6 +142,13 @@ static int stm32_rng_probe(struct platfo
if (IS_ERR(priv->clk))
return PTR_ERR(priv->clk);
+ priv->rst = devm_reset_control_get(&ofdev->dev, NULL);
+ if (!IS_ERR(priv->rst)) {
+ reset_control_assert(priv->rst);
+ udelay(2);
+ reset_control_deassert(priv->rst);
+ }
+
dev_set_drvdata(dev, priv);
priv->rng.name = dev_driver_string(dev),
Powered by blists - more mailing lists