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Thu, 12 Nov 2026 03:04:24 -0800 (PST) Received: from localhost.localdomain ([188.190.249.216]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4983284c990sm15301961f8f.3.2026.11.12.03.04.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Nov 2026 03:04:24 -0800 (PST) From: Vladyslav Tymoshchuk To: Jeff Johnson Cc: Baochen Qiang , ath12k@lists.infradead.org, linux-wireless@vger.kernel.org Subject: ath12k: WCN7880 firmware "NOC ERROR DETECTED" crash during the boot in resume Date: Thu, 12 Nov 2026 13:04:12 +0200 Message-ID: <20261112110412.1941-1-tvlad744@gmail.com> X-Mailer: git-send-email 2.45.1.windows.1 X-Mailing-List: linux-wireless@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, The firmware of the WCN7880 in my tablet sometimes crashes while it boots during a resume from s2idle. The driver side is covered by the series at [1]; this mail is about the crash itself, in case it is known or somebody with the firmware sources can tell what it is. Platform: - OnePlus Pad 3, SM8750, WCN7880 hw2.0 (PCI 17cb:110e, chip_id 0x2, chip_family 0x4, board_id 0xff, soc_id 0x40210200) - v7.3-rc5 plus board patches. ath12k does not support this chip upstream; I run it with an out-of-tree patch that adds it as a WCN7850 derivative - firmware from the device's stock image: WLAN.GNG.1.0-03342-QCAGNGSWPL_V1.0_V2.0_SILICONZ-1.81206.153 (fw_version 0x10097fff, build timestamp 2025-11-18 09:48) - no WoWLAN: ath12k_core_suspend_late() powers the device down and ath12k_core_resume_early() boots the firmware again What happens ------------ In 1 of 64 and in 1 of 240 suspend/resume cycles the firmware goes to RDDM early in that boot. Both times the crash reason of the firmware is the same: NOC_error_patched.c:437:0x8NOC ERROR DETECTED. I have seen this crash reason only on the boot in resume. With WoWLAN enabled the device is not powered down in suspend and there is no such boot. Questions --------- 1. Is this a known firmware problem, and is there a firmware for the WCN7880 newer than the one above? 2. Can anybody tell what the firmware accesses when it reports this? If it is a block that needs a clock or a power rail the host is responsible for during the boot, I can check that side on this board. 3. Is there anything the host should do differently before it boots the firmware in resume (a delay after power up, a reset sequence) that the WCN7850 does not need? Thanks, Vladyslav I used an AI assistant (Claude) for the analysis and to draft this report; I reviewed the result and ran the tests on my device. [1] https://lore.kernel.org/all/20261112110008.1229-1-tvlad744@gmail.com/