[PATCH 1/5] hwrng: stm32 - add reset during probe
From: Lionel Debieve <hidden>
Date: 2018-01-29 17:05:17
Also in:
linux-crypto, lkml
Subsystem:
hardware random number generator core, the rest · Maintainers:
Olivia Mackall, Herbert Xu, Linus Torvalds
Avoid issue when probing the RNG without reset if bad status has been detected previously Signed-off-by: Lionel Debieve <redacted> --- drivers/char/hw_random/stm32-rng.c | 9 +++++++++ 1 file changed, 9 insertions(+)
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),
--
2.15.1