Enhance the thermal core to record the Power State Change Reason (PSCR) prior to invoking hw_protection_shutdown(). This change integrates the PSCR framework with the thermal subsystem, ensuring that reasons for power state changes, such as overtemperature events, are stored in a dedicated non-volatile memory (NVMEM) cell. This 'black box' recording is crucial for post-mortem analysis, enabling a deeper understanding of system failures and abrupt shutdowns, especially in scenarios where PMICs or watchdog timers are incapable of logging such events. The recorded data can be utilized during system recovery routines in the bootloader or early kernel stages of subsequent boots, significantly enhancing system diagnostics, reliability, and debugging capabilities. Signed-off-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx> --- drivers/thermal/thermal_core.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c index dfaa6341694a..0511d82351c5 100644 --- a/drivers/thermal/thermal_core.c +++ b/drivers/thermal/thermal_core.c @@ -16,6 +16,7 @@ #include <linux/kdev_t.h> #include <linux/idr.h> #include <linux/thermal.h> +#include <linux/pscrr.h> #include <linux/reboot.h> #include <linux/string.h> #include <linux/of.h> @@ -329,6 +330,8 @@ static void thermal_zone_device_halt(struct thermal_zone_device *tz, bool shutdo dev_emerg(&tz->device, "%s: critical temperature reached\n", tz->type); + set_power_state_change_reason(PSCR_OVERTEMPERATURE); + if (shutdown) hw_protection_shutdown(msg, poweroff_delay_ms); else -- 2.39.2
