soc/intel/skylake: Set low maximum temperature threshold for Thermal Device

PMC logic shuts down the thermal sensor when CPU is in a C-state and
DTS Temp <= Low Temp Threshold in case Dynamic Thermal Shutdown in
S0ix is enabled.

BUG=b:69110373
BRANCH=none
TEST=Ensure Thermal Device(B0: D20: F2) TSPM offset 0x1c[LTT (8:0)]
value is 0xFA.

Change-Id: I94d09a28bf1ea07a53cfa04c54752358bafca610
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/22419
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Sumeet R Pawnikar <sumeet.r.pawnikar@intel.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/soc/intel/skylake/finalize.c b/src/soc/intel/skylake/finalize.c
index bcaa283598..25b7484eca 100644
--- a/src/soc/intel/skylake/finalize.c
+++ b/src/soc/intel/skylake/finalize.c
@@ -32,6 +32,7 @@
 #include <soc/pm.h>
 #include <soc/smbus.h>
 #include <soc/systemagent.h>
+#include <soc/thermal.h>
 #include <stdlib.h>
 
 #define PSF_BASE_ADDRESS	0xA00
@@ -116,6 +117,15 @@ static void pch_finalize_script(void)
 	config = dev->chip_info;
 
 	/*
+	 * Set low maximum temp value used for dynamic thermal sensor
+	 * shutdown consideration.
+	 *
+	 * If Dynamic Thermal Shutdown is enabled then PMC logic shuts down the
+	 * thermal sensor when CPU is in a C-state and DTS Temp <= LTT.
+	 */
+	pch_thermal_configuration();
+
+	/*
 	 * Disable ACPI PM timer based on dt policy
 	 *
 	 * Disabling ACPI PM timer is necessary for XTAL OSC shutdown.