[v2,1/6] hwrng: imx-rngc - reasonable timeout for selftest
Commit Message
Set a more reasonable timeout for the rngc selftest.
According to the reference manual, "The self test takes approximately
29,000 cycles to complete." With the rngc peripheral clock running at
66.5 MHz, this would be 436us. Let's use 1.5ms insteaf of 3sec for the
timeout.
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
---
v2:
- adjust timeouts before we switch to polling
drivers/char/hw_random/imx-rngc.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
@@ -53,6 +53,7 @@
#define RNGC_TIMEOUT 3000 /* 3 sec */
+#define RNGC_SELFTEST_TIMEOUT 1500 /* 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;