soc/intel/common/dptf: Add method for temp conversion
Add a method to convert from 1/10 Kelvin to Celsius. This
is useful for EC devices where the sensor temperature are
stored in Celsius instead of Kelvin.
Change-Id: I6b1154f5ba13416131a029966d6d5c1598904881
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/c/29758
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/soc/intel/common/acpi/dptf/dptf.asl b/src/soc/intel/common/acpi/dptf/dptf.asl
index beb41e2..1dd57c0 100644
--- a/src/soc/intel/common/acpi/dptf/dptf.asl
+++ b/src/soc/intel/common/acpi/dptf/dptf.asl
@@ -95,6 +95,21 @@
Return (Local0)
}
+ /* Convert from 1/10 Kelvin to Degrees C for ACPI */
+ Method (KTOC, 1) {
+ If (LLessEqual (Arg0, 2732)) {
+ Return (0)
+ }
+
+ /* Convert to Celsius */
+ Subtract (Arg0, 2732, Local0)
+
+ /* Convert from 10th of degrees */
+ Divide (Local0, 10,, Local0)
+
+ Return (Local0)
+ }
+
/* Include Thermal Participants */
#include "thermal.asl"