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Fri, 28 Aug 2026 07:40:58 -0700 (PDT) Received: from server.roeck-us.net ([2600:1700:e321:62f0:da43:aeff:fecc:bfd5]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-3286f9e3cf8sm6759748eec.24.2026.08.28.07.40.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 28 Aug 2026 07:40:58 -0700 (PDT) Date: Fri, 28 Aug 2026 07:40:56 -0700 From: Guenter Roeck To: James Hilliard Cc: Wim Van Sebroeck , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Carlo Caione , Maxime Ripard , Wim Van Sebroeck , linux-watchdog@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH v2] watchdog: sunxi_wdt: preserve boot-enabled watchdog Message-ID: References: <20260827-submit-sunxi-wdt-boot-enabled-v1-v2-1-610d37dccc97@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260827-submit-sunxi-wdt-boot-enabled-v1-v2-1-610d37dccc97@gmail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260828_074101_280933_C3AFEEE6 X-CRM114-Status: GOOD ( 12.64 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Aug 27, 2026 at 10:42:31PM -0600, James Hilliard wrote: > sunxi_wdt_probe() unconditionally stops the watchdog even when firmware > left it running. This opens an unprotected interval during boot and > prevents CONFIG_WATCHDOG_HANDLE_BOOT_ENABLED from taking over the active > watchdog. > > Detect an enabled watchdog and decode its programmed interval. Preserve > representable timeouts, and round the 0.5-second interval up to the > minimum representable one-second timeout. Use the configured timeout for > reserved interval encodings. Set the Linux reset mode and ping the > watchdog without clearing its enable bit, then mark it hardware-running > before registration so the watchdog core services it until userspace > takes control. Leave disabled watchdogs untouched. > > Fixes: d00680ed0026 ("watchdog: sunxi: New watchdog driver for Allwinner A10/A13") > Cc: stable@vger.kernel.org > Signed-off-by: James Hilliard Applied. Thanks, Guenter