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| author | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2019-12-19 10:33:36 +0100 |
|---|---|---|
| committer | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2019-12-19 10:33:36 +0100 |
| commit | 01956ef82685c0793214d0bd28889304c7ed9068 (patch) | |
| tree | 8d4ec514ba1c9e88cb0fd90871777d4917ff113f /drivers/char/hw_random/omap-rng.c | |
| parent | 866ced99cbaa08b8dafdc0b0febf49cd6c3cf5a8 (diff) | |
| parent | fa8a03bec68d9ef89da72277bd3501ed3daa6217 (diff) | |
Merge branch 'github.com/Freescale/linux-fslc/4.14-2.0.x-imx' into toradex_4.14-2.0.x-imx-next
Conflicts:
sound/soc/codecs/sgtl5000.c
Diffstat (limited to 'drivers/char/hw_random/omap-rng.c')
| -rw-r--r-- | drivers/char/hw_random/omap-rng.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/char/hw_random/omap-rng.c b/drivers/char/hw_random/omap-rng.c index 25173454efa3..091753765d99 100644 --- a/drivers/char/hw_random/omap-rng.c +++ b/drivers/char/hw_random/omap-rng.c @@ -66,6 +66,13 @@ #define OMAP4_RNG_OUTPUT_SIZE 0x8 #define EIP76_RNG_OUTPUT_SIZE 0x10 +/* + * EIP76 RNG takes approx. 700us to produce 16 bytes of output data + * as per testing results. And to account for the lack of udelay()'s + * reliability, we keep the timeout as 1000us. + */ +#define RNG_DATA_FILL_TIMEOUT 100 + enum { RNG_OUTPUT_0_REG = 0, RNG_OUTPUT_1_REG, @@ -175,7 +182,7 @@ static int omap_rng_do_read(struct hwrng *rng, void *data, size_t max, if (max < priv->pdata->data_size) return 0; - for (i = 0; i < 20; i++) { + for (i = 0; i < RNG_DATA_FILL_TIMEOUT; i++) { present = priv->pdata->data_present(priv); if (present || !wait) break; |