linux-postmarketos-qcom-sdm670: backport the qcom-spmi-adc-tm5 scaling fix

The thermal monitor measures an NTC thermistor which decreases voltage when the temperature increases.

When fixing the scaling for the first time, a wrong division by 20 was removed. The voltage code was still high by a factor of 28900/16384, enough that the thermal monitor constantly signalled/interrupted at a low voltage/high temperature trip point. The thermal monitor still reports the correct temperature so the kernel keeps the wrong trip points and lets the thermal monitor keep interrupting 1000 times/sec. Fix the other scaling amount so the thermal monitor sends interrupts at the right temperature (with some imprecision).

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Reported by @foxlet:matrix.org via Matrix. Also unfortunately marks the second regression this release.

anyways, tried the new 6.13.3 kernel! yay faster charging on the Pixel 3a!

unfortunately though battery life kinda dropped alongside with it

system's running at 2.2-2.8w rather than the 1.8-2w that it was before (playing a video in mpv on a loop)

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• 2a949c85 - linux-postmarketos-qcom-sdm670: backport the qcom-spmi-adc-tm5 scaling fix

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approved this merge request

Seems to work well here for the last two days.

Is this something that's only used on sdm670, and not e.g on sdm660? Upstream doesn't have any mention of "qcom,spmi-adc-tm-hc" in pm660.dtsi

The thermal monitor on PM660 isn't upstreamed yet, but should work on SDM660 with downstream patches. I can move it to the SDM670 staging queue although that wouldn't give it any timeline of being upstreamed.

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• 2a949c85...d1bbf43a - 25 commits from branch postmarketOS:master
• 7080a062 - linux-postmarketos-qcom-sdm670: backport the qcom-spmi-adc-tm5 scaling fix (MR 6298)

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merged