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    Subject[PATCH 4.4 235/268] hwrng: stm32 - add reset during probe
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: "lionel.debieve@st.com" <lionel.debieve@st.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@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>
    ---
    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),

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