On 15/06/2021 14:53, Dmitry Osipenko wrote: > 13.06.2021 21:19, Daniel Lezcano пишет: >> On 13/06/2021 02:25, Dmitry Osipenko wrote: >> >> [ ... ] >> >>>> You should set the trip points close to the functioning boundary >>>> temperature given in the hardware specification whatever the resulting >>>> heating effect is on the device. >>>> >>>> The thermal zone is there to protect the silicon and the system from a >>>> wild reboot. >>>> >>>> If the Nexus 7 is too hot after the changes, then you may act on the >>>> sources of the heat. For instance, set the the highest OPP to turbo or >>>> remove it, or, if there is one, change the thermal daemon to reduce the >>>> overall power consumption. >>>> In case you are interested in: https://lwn.net/Articles/839318/ >>> >>> The DTPM is a very interesting approach. For now Tegra still misses some >>> basics in mainline kernel which have a higher priority, so I think it >>> should be good enough to perform the in-kernel thermal management for >>> the starter. We may consider a more complex solutions later on if will >>> be necessary. >>> >>> What I'm currently thinking to do is: >>> >>> 1. Set up the trips of SoC/CPU core thermal zones in accordance to the >>> silicon limits. >>> >>> 2. Set up the skin trips in accordance to the device limits. >>> >>> The breached skin trips will cause a mild throttling, while the SoC/CPU >>> trips will be allowed to cause the severe throttling. Does this sound >>> good to you? >> >> The skin temperature must be managed from userspace. The kernel is >> unable to do a smart thermal management given different thermal zones >> but if the goal is to go forward and prevent the tablet to be hot >> temporarily until the other hardware support is there, I think it is >> acceptable. > > The current goal is to get maximum from what we already have, thank you. maximum of performance or maximum of mitigation ? -- <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook | <http://twitter.com/#!/linaroorg> Twitter | <http://www.linaro.org/linaro-blog/> Blog
