hwrng: stm32 - add reset during probe

[ 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>

diff --git a/drivers/char/hw_random/stm32-rng.c b/drivers/char/hw_random/stm32-rng.c
index 92a8106..530aacc 100644 (file)
--- 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 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),