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hw/misc/tmp105: reset the T_low and T_High registers

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The TMP105 datasheet (https://www.ti.com/lit/gpn/tmp105) says that the
power-up reset values for the T_low and T_high registers are 80 degrees C
and 75 degrees C, which are 0x500 and 0x4B0 hex according to table 5.  These
values are then shifted right by four bits to give the register reset
values, since both registers store the 12 bits of temperature data in bits
[15..4] of a 16 bit register.

We were resetting these registers to zero, which is problematic for Linux
guests which enable the alert interrupt and then immediately take an
unexpected overtemperature alert because the current temperature is above
freezing...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Message-id: 20201110150023.25533-2-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2020-11-17 12:56:33 +00:00
parent 13ceae6663
commit e1919889ef
1 changed files with 3 additions and 0 deletions
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3
hw/misc/tmp105.c
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@ -225,6 +225,9 @@ static void tmp105_reset(I2CSlave *i2c)
s->faults = tmp105_faultq[(s->config >> 3) & 3];
s->alarm = 0;
s->limit[0] = 0x4b00; /* T_LOW, 75 degrees C */
s->limit[1] = 0x5000; /* T_HIGH, 80 degrees C */
tmp105_interrupt_update(s);
}