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[34.125.143.123]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2f888c469b6sm15066942eec.24.2026.05.11.13.06.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 May 2026 13:06:28 -0700 (PDT) From: "William A. Kennington III" Subject: [PATCH v5 0/4] i2c: designware: Improve device disable handling Date: Mon, 11 May 2026 20:06:25 +0000 Message-Id: <20260511-dw-i2c-v5-0-6c382e1b5de6@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=H4sIAME2AmoC/2WOyw6CMBBFf4V07ZjpC9SV/2FcFFpgorSmENAQ/ t3iQk1YnuSekzuz3kVyPTtlM4tupJ6CT6B3Gata4xsHZBMzgSJHjQrsBCQqsNrwkhtEmRuWxo/ oanp+Qpdr4jqGDoY2OvPTlZCIWii+PxxRK+Aw0f1OpjtPN+c9+WYIfl+Fbg221A8hvj7HRrlmN x9GCQi6cDrnUtscxaazPhnVv1x8ZZXko1GqKIUsa1tv5WVZ3hQZJ9YgAQAA 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 controller attempts a new transaction while the target 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 target activity is detected. Additionally, it adds a shutdown hook that gracefully sets the target disable bit before disabling the controller. This guarantees that any incoming requests from the controller are immediately NACKed during shutdown, preventing the bus from hanging. Signed-off-by: William A. Kennington III --- Changes in v5: - Fixed one last inclusive language mistake - Link to v4: https://lore.kernel.org/r/20260507-dw-i2c-v4-0-9a447b23bfdf@wkennington.com Changes in v4: - Updated language to use inclusive terms - Refactored some minor comment / code nits - Link to v3: https://lore.kernel.org/r/20260504-dw-i2c-v3-0-57e56135d602@wkennington.com 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 --- 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 target cleanly drivers/i2c/busses/i2c-designware-common.c | 32 +++++++++++++++++++++++++++++ drivers/i2c/busses/i2c-designware-core.h | 1 + drivers/i2c/busses/i2c-designware-master.c | 31 +++++++++++++++++----------- drivers/i2c/busses/i2c-designware-pcidrv.c | 14 +++++++++++++ drivers/i2c/busses/i2c-designware-platdrv.c | 14 +++++++++++++ 5 files changed, 80 insertions(+), 12 deletions(-) --- base-commit: 5d6919055dec134de3c40167a490f33c74c12581 change-id: 20260504-dw-i2c-d5a1b1a0036a Best regards, -- William A. Kennington III