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Commit 326ed382 authored by lionel.debieve@st.com's avatar lionel.debieve@st.com Committed by Herbert Xu
Browse files

hwrng: stm32 - add reset during probe 



Avoid issue when probing the RNG without
reset if bad status has been detected previously

Signed-off-by: default avatarLionel Debieve <lionel.debieve@st.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 01745706

drivers/char/hw_random/stm32-rng.c

+9 −0
Original line number Diff line number Diff line
@@ -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 platform_device *ofdev) 
	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),