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Make sleep threshold for delays configurable

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This allows the minimum time that default_delay() will choose to sleep
for instead of polling to be configured at build-time. The default
remains unchanged at 100 milliseconds for now.

The test's correctness has been checked by testing with minimum sleep
time left at its default and set to a non-default value smaller than 100
microseconds (both pass without sleeping, verified with strace) and with
the minimum sleep time set to 0 (causing the test to be skipped). The
configured value from the macro needs to be stored in a const to avoid
-Werror=type-limits errors when configured to be zero.

Change-Id: Ida96e0816ac914ed69d6fd82ad90ebe89cdef1cc
Signed-off-by: Peter Marheine <pmarheine@chromium.org>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/81606
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
This commit is contained in:
Peter Marheine
2024-03-28 13:43:08 +11:00
parent 9a86bd3113
commit 59c4597071
6 changed files with 38 additions and 10 deletions
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9
udelay_dos.c
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@ -153,19 +153,20 @@ void internal_sleep(unsigned int usecs)
usleep(usecs % 1000000);
}
static const unsigned min_sleep = CONFIG_DELAY_MINIMUM_SLEEP_US;
/* Precise delay. */
void default_delay(unsigned int usecs)
{
static bool calibrated = false;
/* If the delay is >0.1 s, use internal_sleep because timing does not need to be so precise. */
if (usecs > 100000) {
internal_sleep(usecs);
} else {
if (usecs < min_sleep) {
if (!calibrated) {
myusec_calibrate_delay();
calibrated = true;
}
myusec_delay(usecs);
} else {
internal_sleep(usecs);
}
}