mirror of https://lore.kernel.org/lkml/
 help / color / mirror / Atom feed
From: Dario Binacchi <dario.binacchi@amarulasolutions.com>
To: Ulf Hansson <ulfh@kernel.org>
Cc: dario.binacchi@amarulasolutions.com,
	Lorenzo Pieralisi <lpieralisi@kernel.org>,
	Sudeep Holla <sudeep.holla@kernel.org>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	Daniel Lezcano <daniel.lezcano@kernel.org>,
	Christian Loehle <christian.loehle@arm.com>,
	Russell King <linux@armlinux.org.uk>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Mike Leach <mike.leach@arm.com>,
	James Clark <james.clark@linaro.org>, Leo Yan <leo.yan@arm.com>,
	Frank Li <Frank.Li@nxp.com>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	Fabio Estevam <festevam@gmail.com>,
	linux-pm@vger.kernel.org, coresight@lists.linaro.org,
	imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, regressions@lists.linux.dev
Subject: [REGRESSION] cpuidle: psci: boot stall/hang on i.MX8MP
Date: Fri, 30 Oct 2026 18:19:09 +0100	[thread overview]
Message-ID: <20261030171910.2822677-1-dario.binacchi@amarulasolutions.com> (raw)

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

                 reply	other threads:[~2026-10-30 17:19 UTC|newest]

Thread overview: [no followups] expand[flat|nested]  mbox.gz  Atom feed

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20261030171910.2822677-1-dario.binacchi@amarulasolutions.com \
    --to=dario.binacchi@amarulasolutions.com \
    --cc=Frank.Li@nxp.com \
    --cc=christian.loehle@arm.com \
    --cc=coresight@lists.linaro.org \
    --cc=daniel.lezcano@kernel.org \
    --cc=festevam@gmail.com \
    --cc=imx@lists.linux.dev \
    --cc=james.clark@linaro.org \
    --cc=leo.yan@arm.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pm@vger.kernel.org \
    --cc=linux@armlinux.org.uk \
    --cc=lpieralisi@kernel.org \
    --cc=mike.leach@arm.com \
    --cc=rafael@kernel.org \
    --cc=regressions@lists.linux.dev \
    --cc=s.hauer@pengutronix.de \
    --cc=sudeep.holla@kernel.org \
    --cc=suzuki.poulose@arm.com \
    --cc=ulfh@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®