Hi,
I've been doing a bit of work with the upstream kernel on
exynos5250-snow and noticed an annoying delay of several seconds when
the max77686 rtc gets probed. The longer time that I sit in the
bootloader the longer the delay is.
I've tracked down the line and found that this little piece of code is
causing the delay:
/* Minimum 16ms delay required before RTC update. */
msleep(MAX77686_RTC_UPDATE_DELAY);
...that doesn't make a whole lot of sense, so I tracked things down a
bit more. It appears that if I disable _either_ the MCT timer _or_
the ARM arch timers that the problem magically goes away. In other
words, either of these will do it:
mct@101C0000 {
status = "disabled";
};
timer {
status = "disabled";
};
Disabling either of the timers also fixes the rather annoying jump
from 0 seconds to ~2910 seconds at boot time.
Does anyone have time to dig into this?
---
Here's the log showing the big jump in time:
[ 0.008067] Switching to timer-based delay loop
[ 2910.537817] Console: colour dummy device 80x30
---
...and the big delay when the RTC is probed:
[ 2911.609317] max77686-rtc max77686-rtc: max77686_rtc_probe
[ 2920.652394] max77686-rtc max77686-rtc: rtc core: registered
max77686-rtc as rtc0
---
-Doug
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