diff options
| author | lionel.debieve@st.com <lionel.debieve@st.com> | 2018-02-15 14:03:08 +0100 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2018-03-03 00:03:08 +0800 |
| commit | 326ed382256475aa4b8b7eae8a2f60689fd25e78 (patch) | |
| tree | ca40e54fdbf09b8b0fcffd96f73de2b9cd332470 | |
| parent | 017457061e07852b7173e6a2578c129b49033204 (diff) | |
| download | linux-stable-326ed382256475aa4b8b7eae8a2f60689fd25e78.tar.gz linux-stable-326ed382256475aa4b8b7eae8a2f60689fd25e78.tar.bz2 linux-stable-326ed382256475aa4b8b7eae8a2f60689fd25e78.zip | |
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 <lionel.debieve@st.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
| -rw-r--r-- | drivers/char/hw_random/stm32-rng.c | 9 |
1 files changed, 9 insertions, 0 deletions
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 <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), |