From 9b9e72b9aa8b29c58e687764ed804b6bd4be8637 Mon Sep 17 00:00:00 2001
From: Lightos1 <124387232+Lightos1@users.noreply.github.com>
Date: Wed, 17 Dec 2025 21:37:38 +0100
Subject: [PATCH] Add true cpu cap

---
 .../stratosphere/loader/source/oc/customize.cpp   |  9 ++++++---
 .../stratosphere/loader/source/oc/customize.hpp   |  1 +
 .../stratosphere/loader/source/oc/pcv/pcv.hpp     | 15 +++++++++++++++
 .../loader/source/oc/pcv/pcv_mariko.cpp           |  3 ++-
 4 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/Source/Atmosphere/stratosphere/loader/source/oc/customize.cpp b/Source/Atmosphere/stratosphere/loader/source/oc/customize.cpp
index dbe3bb68..ac230ad2 100644
--- a/Source/Atmosphere/stratosphere/loader/source/oc/customize.cpp
+++ b/Source/Atmosphere/stratosphere/loader/source/oc/customize.cpp
@@ -29,9 +29,6 @@
 
 namespace ams::ldr::oc {
 
-//volatile EristaMtcTable EristaMtcTablePlaceholder = { .rev = ERISTA_MTC_MAGIC, };
-//volatile MarikoMtcTable MarikoMtcTablePlaceholder = { .rev = MARIKO_MTC_MAGIC, };
-
 volatile CustomizeTable C = {
 
 .mtcConf = AUTO_ADJ_BL,
@@ -70,6 +67,12 @@ volatile CustomizeTable C = {
 .marikoCpuHighVmin = 750,
 .marikoCpuMaxVolt = 1120,
 
+/* Supported values: 2397000, 2499000, 2601000, 2703000. */
+/* 2499000 should be used with caution. */
+/* 2601000 exceeds pmic limit on most consoles. */
+/* 2703000 is potentially dangerous and not advised. */
+.marikoCpuMaxClock = 2397000,
+
 .eristaCpuBoostClock = 1785000, // Default boost clock
 .marikoCpuBoostClock = 1963000, // Default boost clock
 
diff --git a/Source/Atmosphere/stratosphere/loader/source/oc/customize.hpp b/Source/Atmosphere/stratosphere/loader/source/oc/customize.hpp
index 7e47b98d..645cfa6f 100644
--- a/Source/Atmosphere/stratosphere/loader/source/oc/customize.hpp
+++ b/Source/Atmosphere/stratosphere/loader/source/oc/customize.hpp
@@ -86,6 +86,7 @@ typedef struct CustomizeTable {
     u32 marikoCpuLowVmin;
     u32 marikoCpuHighVmin;
     u32 marikoCpuMaxVolt;
+    u32 marikoCpuMaxClock;
 
     u32 eristaCpuBoostClock;
     u32 marikoCpuBoostClock;
diff --git a/Source/Atmosphere/stratosphere/loader/source/oc/pcv/pcv.hpp b/Source/Atmosphere/stratosphere/loader/source/oc/pcv/pcv.hpp
index e5a207d0..9347551d 100644
--- a/Source/Atmosphere/stratosphere/loader/source/oc/pcv/pcv.hpp
+++ b/Source/Atmosphere/stratosphere/loader/source/oc/pcv/pcv.hpp
@@ -60,6 +60,21 @@ namespace ams::ldr::oc::pcv {
         constexpr s32 CpuVoltageSecondaryPatchOffsets[] = { -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
         static_assert(sizeof(CpuVoltageSecondaryPatchValues) == sizeof(CpuVoltageSecondaryPatchOffsets), "Invalid secondary CpuVoltagePatch size");
 
+        constexpr u32 CapCpuClock() {
+            constexpr u32 AllowedCpuMaxFrequencies[] = { 2'397'000, 2'499'000, 2'601'000, 2'703'000, };
+
+            u32 cpuCap = AllowedCpuMaxFrequencies[0];
+
+            for (u32 freq : AllowedCpuMaxFrequencies) {
+                if (C.marikoCpuMaxClock >= freq) {
+                    cpuCap = freq;
+                } else {
+                    break;
+                }
+            }
+            return cpuCap;
+        }
+
         constexpr cvb_entry_t GpuCvbTableDefault[] = {
             // GPUB01_NA_CVB_TABLE
             {   76800, {}, {  610000,                                 } },
diff --git a/Source/Atmosphere/stratosphere/loader/source/oc/pcv/pcv_mariko.cpp b/Source/Atmosphere/stratosphere/loader/source/oc/pcv/pcv_mariko.cpp
index 8746f212..998fa80e 100644
--- a/Source/Atmosphere/stratosphere/loader/source/oc/pcv/pcv_mariko.cpp
+++ b/Source/Atmosphere/stratosphere/loader/source/oc/pcv/pcv_mariko.cpp
@@ -98,8 +98,9 @@ namespace ams::ldr::oc::pcv::mariko {
         R_UNLESS(entry->min_mv == 250'000, ldr::ResultInvalidCpuFreqVddEntry());
         R_UNLESS(entry->step_mv == 5000, ldr::ResultInvalidCpuFreqVddEntry());
         R_UNLESS(entry->max_mv == 1525'000, ldr::ResultInvalidCpuFreqVddEntry());
+
         if (C.marikoCpuUVHigh) {
-            PATCH_OFFSET(ptr, GetDvfsTableLastEntry(C.marikoCpuDvfsTableSLT)->freq);
+            PATCH_OFFSET(ptr, CapCpuClock());
         } else {
             PATCH_OFFSET(ptr, GetDvfsTableLastEntry(C.marikoCpuDvfsTable)->freq);
         }