Currently, if the system crashes or hangs during kernel boot before
userspace initializes and configures the watchdog timer, then the
watchdog won’t be able to recover the system as it’s not running. This
becomes crucial during an over-the-air update, where if the newly
updated kernel crashes on boot, the watchdog is needed to reset the
device and boot into an alternative system partition. If the watchdog
is disabled in such scenarios, it can lead to the system getting
bricked.
Enable the WDT during driver probe to allow recovery from any crash/hang
seen during early kernel boot. Also, disable interrupts once userspace
starts pinging the watchdog.
Bug 5391604
Change-Id: If9e85751d8a9efeff943607231170283f0acebdd
Signed-off-by: Kartik Rajput <kkartik@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/3rdparty/canonical/linux-noble/+/3419907
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-by: Brad Griffis <bgriffis@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
Kartik Rajput
fb925f9cec