Hi John,
On 05/08/2025 09:49, John Madieu wrote:
[ ... ]
I might not get what you are asking, but since I compute the
temperature in the hard IRQ handler, I just wait for it to complete
and notify the completion so I can grab the processed value to notify
the thermal core.
Please let me know if this does not answer your question.
Can you describe how the sensor works ? And perhaps if you have a pointer
to some documentation ?
Here is the documentation [1]. The thermal device is referred to as TSU.
[1] https://www.renesas.com/en/document/mah/rzg3e-group-users-manual-hardware?r=25574493
[ ... ]
Thanks for the pointer. I got it now ;)
I'm a bit worried about the latency introduced by this mechanism when
the system is entering in a thermal pressure episode.
The get_temp function wait for a completion up to 100ms, it is a lot.
Especially if the userspace can be reading the temperature and blocking
the read.
There is also the spin_lock taken introducing another lock while the
get_temp function is holding a mutex on the thermal zone.
Did you it that under stress ?
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