CPU cores on RK3576 are supposed to drop voltage and frequency when crossing the 85C temperature mark, and the default "stepwise" thermal governor normally drops the voltage and frequency further if the existing state cannot cool the system down sufficiently to get inside the prescribed boundary.
Right now though it seems possible to overheat the SoC to at least 93C without it throttling below the second-highest OPP (by putting the device under a pillow to block convective heat dissipation and fully loading all CPU and GPU cores). This must be some bug with TSADC interrupts preventing the thermal governor from kicking in - needs to be investigated and fixed
CPU cores on RK3576 are supposed to drop voltage and frequency when crossing the 85C temperature mark, and the default "stepwise" thermal governor normally drops the voltage and frequency further if the existing state cannot cool the system down sufficiently to get inside the prescribed boundary.
Right now though it seems possible to overheat the SoC to at least 93C without it throttling below the second-highest OPP (by putting the device under a pillow to block convective heat dissipation and fully loading all CPU and GPU cores). This must be some bug with TSADC interrupts preventing the thermal governor from kicking in - needs to be investigated and fixed