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ACPI: Evaluate thermal trip points before reading temperature

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An HP laptop (Pavilion G4-1016tx) has the following code in _TMP:

       Store (\_SB.PCI0.LPCB.EC0.RTMP, Local0)
       If (LGreaterEqual (Local0, S4TP))
       {
           Store (One, HTS4)
       }

S4TP is initialised at 0 and not programmed further until either _HOT or
_CRT is called. If we evaluate _TMP before the trip points then HTS4 will
always be set, causing the firmware to generate a message on boot
complaining that the system shut down because of overheating. The simplest
solution is just to reverse the checking of trip points and _TMP in thermal
init.

Signed-off-by: Matthew Garrett <[email protected]>
Signed-off-by: Len Brown <[email protected]>
This commit is contained in:
Matthew Garrett 2012-02-01 10:26:54 -05:00 • committed by Len Brown
commit 9bcb811896
1 changed files with 4 additions and 4 deletions
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8
drivers/acpi/thermal.c
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@ -941,13 +941,13 @@ static int acpi_thermal_get_info(struct acpi_thermal *tz)
if (!tz)
return -EINVAL;
/* Get temperature [_TMP] (required) */
result = acpi_thermal_get_temperature(tz);
/* Get trip points [_CRT, _PSV, etc.] (required) */
result = acpi_thermal_get_trip_points(tz);
if (result)
return result;
/* Get trip points [_CRT, _PSV, etc.] (required) */
result = acpi_thermal_get_trip_points(tz);
/* Get temperature [_TMP] (required) */
result = acpi_thermal_get_temperature(tz);
if (result)
return result;