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[79.14.29.58]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4abf368bff7sm74252355e9.2.2026.10.30.10.19.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Oct 2026 10:19:18 -0700 (PDT) From: Dario Binacchi To: Ulf Hansson Cc: dario.binacchi@amarulasolutions.com, 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@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 Message-ID: <20261030171910.2822677-1-dario.binacchi@amarulasolutions.com> X-Mailer: git-send-email 2.43.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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