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rng: msm: keep core clock disabled when PRNG not in use

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This is how the kernel does it. APQ8016E TRM also states that this clock
can be turned off when no random numbers are needed.

Signed-off-by: Sam Day <me@samcday.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Caleb Connolly <caleb.connolly@linaro.org>
Link: https://lore.kernel.org/r/20250212-msm-rng-fixes-v2-5-645cf8d3fd3c@samcday.com
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
This commit is contained in:
Sam Day
2025-02-12 07:01:55 +00:00
committed by Caleb Connolly
parent dc8754e8e4
commit 2babb61428
1 changed files with 10 additions and 1 deletions
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11
drivers/rng/msm_rng.c
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@@ -44,6 +44,11 @@ static int msm_rng_read(struct udevice *dev, void *data, size_t len)
u32 *retdata = data;
size_t maxsize;
u32 val;
int ret;
ret = clk_enable(&priv->clk);
if (ret < 0)
return ret;
/* calculate max size bytes to transfer back to caller */
maxsize = min_t(size_t, MAX_HW_FIFO_SIZE, len);
@@ -66,6 +71,8 @@ static int msm_rng_read(struct udevice *dev, void *data, size_t len)
break;
} while (currsize < maxsize);
clk_disable(&priv->clk);
return 0;
}
@@ -118,7 +125,9 @@ static int msm_rng_probe(struct udevice *dev)
if (ret < 0)
return ret;
return msm_rng_enable(priv, 1);
ret = msm_rng_enable(priv, 1);
clk_disable(&priv->clk);
return ret;
}
static int msm_rng_remove(struct udevice *dev)