Change in coreboot[master]: purism/librem_skl: Set TCC Activation at 95C

[Matt DeVillier (Code Review)]

Matt DeVillier has uploaded this change for review. ( https://review.coreboot.org/25323

Change subject: purism/librem_skl: Set TCC Activation at 95C
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purism/librem_skl: Set TCC Activation at 95C

Set the Thermal Control Circuit (TCC) activaction value to 95C
even though FSP integration guide says to set it to 100C for SKL-U
(offset at 0), because when the TCC activates at 100C, the CPU
will have already shut itself down from overheating protection.

This was tested on Purism Librem 13 v2. A bisect showed that the
immediate shutdowns happened after commit [1] was merged which led
to this solution.

[1] ec5a947b (soc/intel/skylake: make tcc_offset take effect)

Change-Id: Idfc001c8e46ed3b07b24150c961c4b9bc9b71a62
Signed-off-by: Youness Alaoui 
Signed-off-by: Matt DeVillier 
---
M src/mainboard/purism/librem_skl/variants/librem13v2/devicetree.cb
M src/mainboard/purism/librem_skl/variants/librem15v3/devicetree.cb
2 files changed, 12 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/23/25323/1

diff --git a/src/mainboard/purism/librem_skl/variants/librem13v2/devicetree.cb b/src/mainboard/purism/librem_skl/variants/librem13v2/devicetree.cb
index 9ce1d91..159d921 100644
--- a/src/mainboard/purism/librem_skl/variants/librem13v2/devicetree.cb
+++ b/src/mainboard/purism/librem_skl/variants/librem13v2/devicetree.cb
@@ -10,6 +10,12 @@
    register "eist_enable" = "1"
    register "VmxEnable" = "1"

+	# Set the Thermal Control Circuit (TCC) activaction value to 95C
+	# even though FSP integration guide says to set it to 100C for SKL-U
+	# (offset at 0), because when the TCC activates at 100C, the CPU
+	# will have already shut itself down from overheating protection.
+	register "tcc_offset" = "5" # TCC of 95C
+
    # GPE configuration
    # Note that GPE events called out in ASL code rely on this
    # route. i.e. If this route changes then the affected GPE
diff --git a/src/mainboard/purism/librem_skl/variants/librem15v3/devicetree.cb b/src/mainboard/purism/librem_skl/variants/librem15v3/devicetree.cb
index ac082e6..035db18 100644
--- a/src/mainboard/purism/librem_skl/variants/librem15v3/devicetree.cb
+++ b/src/mainboard/purism/librem_skl/variants/librem15v3/devicetree.cb
@@ -10,6 +10,12 @@
    register "eist_enable" = "1"
    register "VmxEnable" = "1"

+	# Set the Thermal Control Circuit (TCC) activaction value to 95C
+	# even though FSP integration guide says to set it to 100C for SKL-U
+	# (offset at 0), because when the TCC activates at 100C, the CPU
+	# will have already shut itself down from overheating protection.
+	register "tcc_offset" = "5" # TCC of 95C
+
    # GPE configuration
    # Note that GPE events called out in ASL code rely on this
    # route. i.e. If this route changes then the affected GPE