Samples are documented to be available every 0.667us, so in theory
the 8 sample deep FIFO should take 5.336us to fill. However, during
thorough testing, it became apparent that filling the FIFO actually
takes closer to 12us.
Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx>
---
drivers/char/hw_random/st-rng.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/char/hw_random/st-rng.c b/drivers/char/hw_random/st-rng.c
index 8c8a435..a1ff080 100644
--- a/drivers/char/hw_random/st-rng.c
+++ b/drivers/char/hw_random/st-rng.c
@@ -32,8 +32,13 @@
#define ST_RNG_FIFO_SIZE 8
#define ST_RNG_SAMPLE_SIZE 2 /* 2 Byte (16bit) samples */
-/* Samples are available every 0.667us, which we round to 1us */
-#define ST_RNG_FILL_FIFO_TIMEOUT (1 * (ST_RNG_FIFO_SIZE / ST_RNG_SAMPLE_SIZE))
+/*
+ * Samples are documented to be available every 0.667us, so in theory
+ * the 8 sample deep FIFO should take 5.336us to fill. However, during
+ * thorough testing, it became apparent that filling the FIFO actually
+ * takes closer to 12us.
+ */
+#define ST_RNG_FILL_FIFO_TIMEOUT 12
struct st_rng_data {
void __iomem *base;
--
1.9.1
--
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