On Wed, Jun 10, 2020 at 02:18:12PM +0100, Lukasz Luba wrote: > Hi Krzysztof, Bartek, > > I recall that you have been working on some cpuidle code for Exynos(4?). > > I have a question regarding CPUIdle driver for Odroid XU4. > I use the board with LISA tests for EAS, but missing at > least idle state 0 cause errors (please see the log below). > > Currently the system does not report any idle driver and the state 0 > is missing in: /sys/devices/system/cpu/cpu0/cpuidle/state0/ The state 0 long time ago was WFI. It was kind of meaningless so it it was dropped. > > I am using driver CONFIG_ARM_BIG_LITTLE_CPUIDLE but the > boot stops silently while trying to init the cpu idle devices in there. > I carry on with a workaround that just removes idle state[1] and set > state_count=1 in the big and little structures. Try earlyprintk. In general, the big-little cpuidle driver should work... or rather: long time ago it was working. It requires proper support from early stages (BL1, secure monitor) but this should be already in standard Odroid. I just saw there: /* Start at index 1, index 0 standard WFI */ so maybe it was not updated properly to removal of WFI? I think no one uses this driver so it might be not well tested and not that useful. Best regards, Krzysztof
