From de31d4a11e894a73ed7ef2388fb27f0bb4036de3 Mon Sep 17 00:00:00 2001
From: Dhananjay Ugwekar <Dhananjay.Ugwekar@amd.com>
Date: Wed, 23 Oct 2024 10:21:08 +0000
Subject: cpufreq/amd-pstate: Do not attempt to clear MSR_AMD_CPPC_ENABLE

MSR_AMD_CPPC_ENABLE is a write once register, i.e. attempting to clear
it is futile, it will not take effect. Hence, return if disable (0)
argument is passed to the msr_cppc_enable()

Signed-off-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
---
 drivers/cpufreq/amd-pstate.c | 6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -341,6 +341,12 @@ static inline int msr_cppc_enable(bool e
 	int ret, cpu;
 	unsigned long logical_proc_id_mask = 0;
 
+       /*
+        * MSR_AMD_CPPC_ENABLE is write-once, once set it cannot be cleared.
+        */
+	if (!enable)
+		return 0;
+
 	if (enable == cppc_enabled)
 		return 0;