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[34.125.143.123]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-364bdf2aa41sm20568593a91.4.2026.05.04.13.15.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 04 May 2026 13:15:03 -0700 (PDT) From: "William A. Kennington III" Subject: [PATCH v3 0/4] i2c: designware: Improve device disable handling Date: Mon, 04 May 2026 20:15:01 +0000 Message-Id: <20260504-dw-i2c-v3-0-57e56135d602@wkennington.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAEX++GkC/0XMQQ6CMBCF4auQWTtkWlqirryHcVHbASZCSwoRE 8Ldbdy4/JL/vR0WzsILXKsdMr9lkRQLmlMFfnCxZ5RQDJp0S5YMhg1FewzWqadyRE3roMRz5k4 +v6P7o7jLacJ1yOz+c6MbIquNqs8XsgYVbjKO4qbb9uIYJfZrirVPExzHF31YnwyZAAAA X-Change-ID: 20260504-dw-i2c-d5a1b1a0036a To: Mika Westerberg , Andy Shevchenko , Jan Dabros , Andi Shyti Cc: linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, "William A. Kennington III" X-Mailer: b4 0.14.3 When the I2C master attempts a new transaction while the slave controller is shutting down or restarting, it can lead to bus lockups and system bootloops if the hardware enters an inconsistent state. This patch series addresses this by ensuring that the internal state machines are properly cleared when disabling the controller if slave activity is detected. Additionally, it adds a shutdown hook that gracefully sets the slave disable bit before disabling the controller. This guarantees that any incoming requests from the master are immediately NACKed during shutdown, preventing the bus from hanging. --- Changes in v3: - Split the monolithic patch into 4 logical patches - Reverted stray formatting change in the PCI driver's dw_i2c_driver struct. Changes in v2: - Fix description footers - Fix emails Signed-off-by: William A. Kennington III --- William A. Kennington III (4): i2c: designware: Introduce shutdown exported function i2c: designware: Convert PCI driver to use shutdown hook i2c: designware: Convert platform driver to use shutdown hook i2c: designware: Handle active slave cleanly drivers/i2c/busses/i2c-designware-common.c | 32 +++++++++++++++++++++++++++++ drivers/i2c/busses/i2c-designware-core.h | 5 +++-- drivers/i2c/busses/i2c-designware-master.c | 31 +++++++++++++++++----------- drivers/i2c/busses/i2c-designware-pcidrv.c | 15 +++++++++++++- drivers/i2c/busses/i2c-designware-platdrv.c | 13 ++++++++++++ 5 files changed, 81 insertions(+), 15 deletions(-) --- base-commit: 6d35786de28116ecf78797a62b84e6bf3c45aa5a change-id: 20260504-dw-i2c-d5a1b1a0036a Best regards, -- William A. Kennington III