On Mon, Jan 13, 2025 at 05:25:33PM +0100, Ahmad Fatoum wrote: > When the core detects permanent regulator hardware failure or imminent > power failure of a critical supply, it will call hw_protection_shutdown > in an attempt to do a limited orderly shutdown followed by powering off > the system. > > This doesn't work out well for many unattended embedded systems that don't > have support for shutdown and that power on automatically when power is > supplied: > > - A brief power cycle gets detected by the driver > - The kernel powers down the system and SoC goes into shutdown mode > - Power is restored > - The system remains oblivious to the restored power > - System needs to be manually power cycled for a duration long enough > to drain the capacitors > > Allow users to fix this by calling the newly introduced > hw_protection_trigger() instead: This way the hw_protection commandline > or sysfs parameter is used to dictate the policy of dealing with the > regulator fault. > > Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx> Reviewed-by: Tzung-Bi Shih <tzungbi@xxxxxxxxxx>
