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Hi Evan,
Thanks for your email...
On 21/09/2024 15:06, Evan Jobling wrote:
I had a look into this on JG922A today.
I can set the fans to max on initialisation of RTL8231 using gpio-hog.
But it not only is setting initalisation, it also 'hogs' it per description.
So that basically locks out gpio-fan or userspace setting it.
My thoughts were that the kernel's gpio-init code for that SoC shouldn't
reset the gpio state - rather it should leave it in the state that the
firmware configured it. gpio-fan would then do the right thing.
JG922A and JG928A got accepted without max fans by default?
So I hope moving to hwmon and gpio-fan is sufficient?
I think that was probably a mistake - since there is definitely scope
for hardware damage (conceivably even fire) with what is now the default
OpenWRT behaviour for these devices.
This problem is gnarly unfortunately.
I think the only really "correct" ways to proceed are either to allow
user control (defaulting to high speed i.e. delegating the decision), or
to re-implement the same fan control algorithm as the OEM firmware does.
That algorithm could probably be discovered by treating it as a black
box (e.g. giving it different PoE power loads, and/or operating
temperatures, simulating fan failures etc. and observing behaviour).
Unfortunately I think that without access to the hardware specs and/or
carrying out a lot of hardware characterisation work there is too much
guesswork involved in implementing any other algorithm.
Tim.
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