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Provide a slightly more-tolerant set of thermal parameters for PowerMac

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motherboard temperatures. In particular, the U4 northbridge die is very
hard to cool or heat effectively with fans and is not responsive to load.
It generally sits around 64C, where it seems happy, so (like Linux) just
declare that to be its target temperature.

This makes the PowerMac G5 much less loud, with no change in the
temperatures of any system components.

MFC after:	2 weeks
This commit is contained in:
Nathan Whitehorn 2020-10-15 13:43:43 +00:00
parent 766ae4c739
commit 3a3332a0b8
1 changed files with 11 additions and 2 deletions
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13
sys/dev/iicbus/max6690.c
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@ -213,8 +213,17 @@ max6690_fill_sensor_prop(device_t dev)
for (j = 0; j < i; j++) {
sc->sc_sensors[j].dev = dev;
sc->sc_sensors[j].therm.target_temp = 400 + ZERO_C_TO_K;
sc->sc_sensors[j].therm.max_temp = 800 + ZERO_C_TO_K;
/*
* Target value for "KODIAK DIODE" (= northbridge die) should
* be 64C (value from Linux). It operates fine at that
* temperature and has limited responsivity to the fan aimed at
* it, so no point in trying to cool it to 40C.
*/
if (strcmp(sc->sc_sensors[j].therm.name, "KODIAK DIODE") == 0)
sc->sc_sensors[j].therm.target_temp = 640 + ZERO_C_TO_K;
else
sc->sc_sensors[j].therm.target_temp = 400 + ZERO_C_TO_K;
sc->sc_sensors[j].therm.max_temp = 850 + ZERO_C_TO_K;
sc->sc_sensors[j].therm.read =
(int (*)(struct pmac_therm *))(max6690_sensor_read);