* [REGRESSION] cpuidle: psci: boot stall/hang on i.MX8MP
@ 2026-10-30 17:19 Dario Binacchi
0 siblings, 0 replies; only message in thread
From: Dario Binacchi @ 2026-10-30 17:19 UTC (permalink / raw)
To: Ulf Hansson
Cc: dario.binacchi, Lorenzo Pieralisi, Sudeep Holla,
Rafael J. Wysocki, Daniel Lezcano, Christian Loehle,
Russell King, Suzuki K Poulose, Mike Leach, James Clark, Leo Yan,
Frank Li, Sascha Hauer, Fabio Estevam, linux-pm, coresight, imx,
linux-arm-kernel, linux-kernel, regressions
Hi Ulf,
on an i.MX8M Plus Dual board (Engicam i.Core MX8M Plus), mainline
c339f4010dea sometimes stalls for ~0.9 s at boot, or hangs until the
watchdog resets the board, right after:
[ 0.806123] ledtrig-cpu: registered to indicate activity on CPUs
On a good boot the next message comes ~11 ms later.
About 1 boot out of 3 stalls or hangs. With cpuidle.off=1, or
with commit 65705b18162b ("cpuidle: psci: Move initialization a bit
earlier in the boot sequence") reverted, 10 out of 10 boots are fine.
I haven't dug into it much. The stall seems to be in
pl330_driver_init(), so my guess is that it is related to the AMBA bus
reading the ID registers of the CoreSight ETMs while a CPU is already
in cpu_pd_wait, but I may well be wrong.
Any idea?
#regzbot introduced: 65705b18162b
Thanks,
Dario
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2026-10-30 17:19 [REGRESSION] cpuidle: psci: boot stall/hang on i.MX8MP Dario Binacchi
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