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Sun, 12 Apr 2026 17:50:56 -0700 (PDT) Received: from cs20-buildserver.lan ([2402:7500:400:8d94:2e0:4cff:fe68:863]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2b45f6c0219sm10828465ad.10.2026.04.12.17.50.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 12 Apr 2026 17:50:56 -0700 (PDT) From: Stanley Chu X-Google-Original-From: Stanley Chu To: frank.li@nxp.com, miquel.raynal@bootlin.com, alexandre.belloni@bootlin.com, linux-i3c@lists.infradead.org Cc: linux-kernel@vger.kernel.org, tomer.maimon@nuvoton.com, kwliu@nuvoton.com, yschu@nuvoton.com Subject: [PATCH v1 0/2] i3c: master: svc: Fix false SLVSTART issues on NPCM845 Date: Mon, 13 Apr 2026 08:50:38 +0800 Message-Id: <20260413005040.1211107-1-yschu@nuvoton.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260412_175058_003216_761244D0 X-CRM114-Status: UNSURE ( 6.98 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-i3c@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-i3c" Errors-To: linux-i3c-bounces+linux-i3c=archiver.kernel.org@lists.infradead.org From: Stanley Chu The Nuvoton NPCM845 I3C controller has a hardware quirk (SVC_I3C_QUIRK_FALSE_SLVSTART) where a spurious SLVSTART interrupt may be generated. This series addresses two separate issues related to this quirk: 1. A race condition where a real IBI arrives after MSTATUS is latched but before the SLVSTART status is cleared, causing the IRQ handler to return early on a stale snapshot and miss the pending IBI. Fixed by re-reading MSTATUS after clearing the interrupt status. 2. When a target holds SDA low, the controller reports a Master Request (MR). Emitting the required STOP condition in response spuriously sets SLVSTART again, re-entering the MR handler in a loop and causing an IRQ storm. Fixed by explicitly clearing SLVSTART after the STOP in the MR handler. Stanley Chu (2): i3c: master: svc: Fix missed IBI after false SLVSTART on NPCM845 i3c: master: svc: Prevent IRQ storm from false SLVSTART on NPCM845 drivers/i3c/master/svc-i3c-master.c | 25 +++++++++++++++++++++---- 1 file changed, 21 insertions(+), 4 deletions(-) -- 2.34.1 -- linux-i3c mailing list linux-i3c@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-i3c