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path: root/drivers/char/hw_random/stm32-rng.c
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Diffstat (limited to 'drivers/char/hw_random/stm32-rng.c')
-rw-r--r--drivers/char/hw_random/stm32-rng.c18
1 files changed, 15 insertions, 3 deletions
diff --git a/drivers/char/hw_random/stm32-rng.c b/drivers/char/hw_random/stm32-rng.c
index 379bc245c520..0e903d6e22e3 100644
--- a/drivers/char/hw_random/stm32-rng.c
+++ b/drivers/char/hw_random/stm32-rng.c
@@ -220,7 +220,8 @@ static int stm32_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
if (err && i > RNG_NB_RECOVER_TRIES) {
dev_err((struct device *)priv->rng.priv,
"Couldn't recover from seed error\n");
- return -ENOTRECOVERABLE;
+ retval = -ENOTRECOVERABLE;
+ goto exit_rpm;
}
continue;
@@ -238,7 +239,8 @@ static int stm32_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
if (err && i > RNG_NB_RECOVER_TRIES) {
dev_err((struct device *)priv->rng.priv,
"Couldn't recover from seed error");
- return -ENOTRECOVERABLE;
+ retval = -ENOTRECOVERABLE;
+ goto exit_rpm;
}
continue;
@@ -250,6 +252,7 @@ static int stm32_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
max -= sizeof(u32);
}
+exit_rpm:
pm_runtime_mark_last_busy((struct device *) priv->rng.priv);
pm_runtime_put_sync_autosuspend((struct device *) priv->rng.priv);
@@ -353,13 +356,15 @@ static int stm32_rng_init(struct hwrng *rng)
err = readl_relaxed_poll_timeout_atomic(priv->base + RNG_SR, reg,
reg & RNG_SR_DRDY,
10, 100000);
- if (err | (reg & ~RNG_SR_DRDY)) {
+ if (err || (reg & ~RNG_SR_DRDY)) {
clk_disable_unprepare(priv->clk);
dev_err((struct device *)priv->rng.priv,
"%s: timeout:%x SR: %x!\n", __func__, err, reg);
return -EINVAL;
}
+ clk_disable_unprepare(priv->clk);
+
return 0;
}
@@ -384,6 +389,11 @@ static int __maybe_unused stm32_rng_runtime_suspend(struct device *dev)
static int __maybe_unused stm32_rng_suspend(struct device *dev)
{
struct stm32_rng_private *priv = dev_get_drvdata(dev);
+ int err;
+
+ err = clk_prepare_enable(priv->clk);
+ if (err)
+ return err;
if (priv->data->has_cond_reset) {
priv->pm_conf.nscr = readl_relaxed(priv->base + RNG_NSCR);
@@ -465,6 +475,8 @@ static int __maybe_unused stm32_rng_resume(struct device *dev)
writel_relaxed(reg, priv->base + RNG_CR);
}
+ clk_disable_unprepare(priv->clk);
+
return 0;
}