From cb8f04dc839cd8a339ba3bf55fd4627ff7e78903 Mon Sep 17 00:00:00 2001 From: Youness Alaoui Date: Fri, 2 Mar 2018 16:12:04 -0500 Subject: 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 Reviewed-on: https://review.coreboot.org/25323 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi --- src/mainboard/purism/librem_skl/variants/librem13v2/devicetree.cb | 6 ++++++ src/mainboard/purism/librem_skl/variants/librem15v3/devicetree.cb | 6 ++++++ 2 files changed, 12 insertions(+) (limited to 'src') diff --git a/src/mainboard/purism/librem_skl/variants/librem13v2/devicetree.cb b/src/mainboard/purism/librem_skl/variants/librem13v2/devicetree.cb index 84932b2024..3d63f90f72 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 @@ chip soc/intel/skylake 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 989c4ff485..eff7ecaac4 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 @@ chip soc/intel/skylake 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 -- cgit v1.2.3