From c2ece764dabb299a73c29555b46d24db7174da6c Mon Sep 17 00:00:00 2001
From: Antoine Viallon <antoine@lesviallon.fr>
Date: Sat, 27 May 2023 17:47:39 +0200
Subject: [PATCH] [Hardware/AMD] Automatically use amd_pstate=active|guided on
 kernels supporting it

---
 hardware/amd/cpu.nix | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/hardware/amd/cpu.nix b/hardware/amd/cpu.nix
index 8c858a8..29d9a2a 100644
--- a/hardware/amd/cpu.nix
+++ b/hardware/amd/cpu.nix
@@ -3,6 +3,7 @@ with lib;
 let
   generalCfg = config.aviallon.general;
   cpuIsZen = ! isNull (builtins.match "znver[0-9]" generalCfg.cpu.arch);
+  kernelVersion = getVersion config.boot.kernelPackages.kernel;
 in {
   config = mkIf (generalCfg.cpu.vendor == "amd") {
     boot.kernel.sysctl = {
@@ -13,7 +14,14 @@ in {
     };
 
     aviallon.boot.cmdline = {
-      "amd_pstate" = "passive";
+      "amd_pstate" =
+        if versionAtLeast kernelVersion "6.4" then
+          "guided"
+        else if versionAtLeast kernelVersion "6.3" then
+          "active"
+        else
+          "passive"
+        ;
     } // optionalAttrs (generalCfg.cpu.arch == "znver2") {
       # Required for Zen 2
       "amd_pstate.shared_memory" = 1;