Hey guys,
Looks like reboot is broken on RockPro64 (RK3399-based) with mainline u-boot and ATF (ATF already has a fix [1]).
When I type 'reboot' in linux I get back to u-boot, but subsequent linux boot hangs in most cases. Sometimes I get this warning:
[ 62.400363] rcu: INFO: rcu_sched detected stalls on CPUs/tasks: [ 62.418095] rcu: 4-...!: (3 ticks this GP) idle=332/1/0x4000000000000000 softirq=23/24 fqs=13 [ 62.444137] Task dump for CPU 4: [ 62.453791] kworker/4:1 R running task 0 42 2 0x0000002a [ 62.474907] Workqueue: pm genpd_power_off_work_fn [ 62.489013] rcu: rcu_sched kthread starved for 5976 jiffies! g-1147 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 [ 62.519205] rcu: RCU grace-period kthread stack dump: [ 62.534316] rcu_sched R running task 0 10 2 0x00000028
I already checked that regulators are configured correctly, also I tried to disable big CPU cluster in linux and re-initializing CPU voltages in u-boot but unfortunately nothing helps.
There were other reports on #linux-rockchip at freenode that reboot is broken.
Any ideas how to debug it or what could be wrong?
Regards, Vasily
[1] https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/2512