diff options
| author | Martin Kaiser <martin@kaiser.cx> | 2023-09-12 16:31:18 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2023-09-20 13:15:29 +0800 |
| commit | 50fb6d5c58e4a2cefbd88f52f7197f589ae1bb7c (patch) | |
| tree | b668894536d64cae59d89cd2a7e906aeb23130cd /drivers/char | |
| parent | b6c6044b4ba561e3ca2d8a2a815f3091ee7ff33c (diff) | |
| download | linux-50fb6d5c58e4a2cefbd88f52f7197f589ae1bb7c.tar.gz | |
hwrng: imx-rngc - reasonable timeout for initial seed
Set a more reasonable timeout for calculating the initial seed.
The reference manuals says that "The initial seed takes approximately
2,000,000 clock cycles." The rngc peripheral clock runs at >= 33.25MHz,
so seeding takes at most 60ms.
A timeout of 200ms is more appropriate than the current value of 3
seconds.
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/hw_random/imx-rngc.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/char/hw_random/imx-rngc.c b/drivers/char/hw_random/imx-rngc.c index 127c292dfbbfb..118a72acb99b4 100644 --- a/drivers/char/hw_random/imx-rngc.c +++ b/drivers/char/hw_random/imx-rngc.c @@ -51,9 +51,8 @@ #define RNGC_ERROR_STATUS_STAT_ERR 0x00000008 -#define RNGC_TIMEOUT 3000 /* 3 sec */ - #define RNGC_SELFTEST_TIMEOUT 2500 /* us */ +#define RNGC_SEED_TIMEOUT 200 /* ms */ static bool self_test = true; module_param(self_test, bool, 0); @@ -184,7 +183,8 @@ static int imx_rngc_init(struct hwrng *rng) cmd = readl(rngc->base + RNGC_COMMAND); writel(cmd | RNGC_CMD_SEED, rngc->base + RNGC_COMMAND); - ret = wait_for_completion_timeout(&rngc->rng_op_done, msecs_to_jiffies(RNGC_TIMEOUT)); + ret = wait_for_completion_timeout(&rngc->rng_op_done, + msecs_to_jiffies(RNGC_SEED_TIMEOUT)); if (!ret) { ret = -ETIMEDOUT; goto err; |