From b6c6044b4ba561e3ca2d8a2a815f3091ee7ff33c Mon Sep 17 00:00:00 2001 From: Martin Kaiser Date: Tue, 12 Sep 2023 16:31:17 +0200 Subject: [PATCH] hwrng: imx-rngc - reasonable timeout for selftest Set a more reasonable timeout for the rngc selftest. According to the reference manual, "The self test takes approximately 29,000 cycles to complete." The lowest possible frequency of the rngc peripheral clock is 33.25MHz, the selftest would then take about 872us. 2.5ms should be enough for the selftest timeout. Signed-off-by: Martin Kaiser Signed-off-by: Herbert Xu --- drivers/char/hw_random/imx-rngc.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/char/hw_random/imx-rngc.c b/drivers/char/hw_random/imx-rngc.c index e4b385b01b1134..127c292dfbbfbf 100644 --- a/drivers/char/hw_random/imx-rngc.c +++ b/drivers/char/hw_random/imx-rngc.c @@ -53,6 +53,7 @@ #define RNGC_TIMEOUT 3000 /* 3 sec */ +#define RNGC_SELFTEST_TIMEOUT 2500 /* us */ static bool self_test = true; module_param(self_test, bool, 0); @@ -110,7 +111,8 @@ static int imx_rngc_self_test(struct imx_rngc *rngc) cmd = readl(rngc->base + RNGC_COMMAND); writel(cmd | RNGC_CMD_SELF_TEST, 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, + usecs_to_jiffies(RNGC_SELFTEST_TIMEOUT)); imx_rngc_irq_mask_clear(rngc); if (!ret) return -ETIMEDOUT;