[ 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@st.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/pm_runtime.h>
#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
#include <linux/slab.h>
#define RNG_CR 0x00
struct hwrng rng;
void __iomem *base;
struct clk *clk;
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)
};
static int stm32_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
if (IS_ERR(priv->clk))
return PTR_ERR(priv->clk);
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),
dev_set_drvdata(dev, priv);
priv->rng.name = dev_driver_string(dev),