From 326ed382256475aa4b8b7eae8a2f60689fd25e78 Mon Sep 17 00:00:00 2001 From: "lionel.debieve@st.com" Date: Thu, 15 Feb 2018 14:03:08 +0100 Subject: hwrng: stm32 - add reset during probe Avoid issue when probing the RNG without reset if bad status has been detected previously Signed-off-by: Lionel Debieve Signed-off-by: Herbert Xu --- drivers/char/hw_random/stm32-rng.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'drivers/char/hw_random') diff --git a/drivers/char/hw_random/stm32-rng.c b/drivers/char/hw_random/stm32-rng.c index 63d84e6f1891..83c695938a2d 100644 --- a/drivers/char/hw_random/stm32-rng.c +++ b/drivers/char/hw_random/stm32-rng.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #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), -- cgit v1.2.3