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coreboot-dasahro: add Dasharo/coreboot#847 on top of 1.0.1 for testing (Improve performance by lowering the EPP value from the power-on default of 0xb3 (70%) to 0x73 (45%). Lower value = higher performance.)
Test fix for Dasharo/dasharo-issues#1711 related: - #2039 - Dasharo/dasharo-issues#1711 - #1894 Signed-off-by: Thierry Laurion <insurgo@riseup.net>
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‎patches/coreboot-dasharo-unreleased/847.patch‎

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From 3730ed80345632754fbdecf0bfddb89e4fd45847 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Micha=C5=82=20Kope=C4=87?= <michal.kopec@3mdeb.com>
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Date: Thu, 12 Feb 2026 16:49:40 +0100
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Subject: [PATCH] mb/novacustom/mtl-h: Bump Energy Performance Preference to
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45%
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Improve performance by lowering the EPP value from the power-on default
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of 0xb3 (70%) to 0x73 (45%). Lower value = higher performance.
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Upstream-Status: Pending
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Change-Id: I5a1f48dd2b563cf7dc37f7682317e5b7f81ad13c
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Signed-off-by: Michał Kopeć <michal.kopec@3mdeb.com>
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---
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src/mainboard/novacustom/mtl-h/variants/dgpu/overridetree.cb | 4 ++++
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src/mainboard/novacustom/mtl-h/variants/igpu/overridetree.cb | 4 ++++
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2 files changed, 8 insertions(+)
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diff --git a/src/mainboard/novacustom/mtl-h/variants/dgpu/overridetree.cb b/src/mainboard/novacustom/mtl-h/variants/dgpu/overridetree.cb
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index 73edf9c3ea8..d5d61b196a1 100644
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--- a/src/mainboard/novacustom/mtl-h/variants/dgpu/overridetree.cb
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+++ b/src/mainboard/novacustom/mtl-h/variants/dgpu/overridetree.cb
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@@ -11,6 +11,10 @@ chip soc/intel/meteorlake
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# MTL SOC has additional setting for PsysPmax
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register "psys_pmax_watts" = "180"
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+ # set EPP to 45%: 45 * 256/100 = 115 = 0x73
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+ register "enable_energy_perf_pref" = "true"
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+ register "energy_perf_pref_value" = "0x73"
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+
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device domain 0 on
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subsystemid 0x1558 0xa741 inherit
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device ref pcie_rp12 on # PEG
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diff --git a/src/mainboard/novacustom/mtl-h/variants/igpu/overridetree.cb b/src/mainboard/novacustom/mtl-h/variants/igpu/overridetree.cb
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index 3745a68df56..b7a71b2e1df 100644
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--- a/src/mainboard/novacustom/mtl-h/variants/igpu/overridetree.cb
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+++ b/src/mainboard/novacustom/mtl-h/variants/igpu/overridetree.cb
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@@ -11,6 +11,10 @@ chip soc/intel/meteorlake
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# MTL SOC has additional setting for PsysPmax
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register "psys_pmax_watts" = "99"
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+ # set EPP to 45%: 45 * 256/100 = 115 = 0x73
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+ register "enable_energy_perf_pref" = "true"
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+ register "energy_perf_pref_value" = "0x73"
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+
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device domain 0 on
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subsystemid 0x1558 0xa743 inherit
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device ref igpu on

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