diff --git a/drivers/cpufreq/amd-pstate-ut.c b/drivers/cpufreq/amd-pstate-ut.c
--- a/drivers/cpufreq/amd-pstate-ut.c
+++ b/drivers/cpufreq/amd-pstate-ut.c
@@ -560,6 +560,11 @@ static int amd_pstate_ut_check_freq_attrs(u32 index)
 static int __init amd_pstate_ut_init(void)
 {
 	u32 i = 0, arr_size = ARRAY_SIZE(amd_pstate_ut_cases);
+	enum amd_pstate_mode mode = amd_pstate_get_status();
+
+	/* don't test if no running amd-pstate driver */
+	if (mode == AMD_PSTATE_UNDEFINED || mode == AMD_PSTATE_DISABLE)
+		return -EOPNOTSUPP;
 
 	for (i = 0; i < arr_size; i++) {
 		int ret;
diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -199,7 +199,7 @@ static inline int get_mode_idx_from_str(const char *str, size_t size)
 
 static DEFINE_MUTEX(amd_pstate_driver_lock);
 
-static u8 msr_get_epp(struct amd_cpudata *cpudata)
+static int msr_get_epp(struct amd_cpudata *cpudata)
 {
 	u64 value;
 	int ret;
@@ -215,12 +215,12 @@ static u8 msr_get_epp(struct amd_cpudata *cpudata)
 
 DEFINE_STATIC_CALL(amd_pstate_get_epp, msr_get_epp);
 
-static inline s16 amd_pstate_get_epp(struct amd_cpudata *cpudata)
+static inline int amd_pstate_get_epp(struct amd_cpudata *cpudata)
 {
 	return static_call(amd_pstate_get_epp)(cpudata);
 }
 
-static u8 shmem_get_epp(struct amd_cpudata *cpudata)
+static int shmem_get_epp(struct amd_cpudata *cpudata)
 {
 	u64 epp;
 	int ret;
@@ -526,9 +526,6 @@ static int shmem_init_perf(struct amd_cpudata *cpudata)
 	WRITE_ONCE(cpudata->perf, perf);
 	WRITE_ONCE(cpudata->prefcore_ranking, cppc_perf.highest_perf);
 
-	if (cppc_state == AMD_PSTATE_ACTIVE)
-		return 0;
-
 	ret = cppc_get_auto_sel(cpudata->cpu, &auto_sel);
 	if (ret) {
 		pr_warn("failed to get auto_sel, ret: %d\n", ret);
@@ -1174,6 +1171,9 @@ static int amd_pstate_power_supply_notifier(struct notifier_block *nb,
 	if (cpudata->current_profile != PLATFORM_PROFILE_BALANCED)
 		return 0;
 
+	if (!policy)
+		return NOTIFY_OK;
+
 	epp = amd_pstate_get_balanced_epp(policy);
 
 	ret = amd_pstate_set_epp(policy, epp);
@@ -1209,6 +1209,9 @@ static int amd_pstate_profile_set(struct device *dev,
 	struct cpufreq_policy *policy __free(put_cpufreq_policy) = cpufreq_cpu_get(cpudata->cpu);
 	int ret;
 
+	if (!policy)
+		return -ENODEV;
+
 	switch (profile) {
 	case PLATFORM_PROFILE_LOW_POWER:
 		ret = amd_pstate_set_epp(policy, AMD_CPPC_EPP_POWERSAVE);
@@ -1877,6 +1880,7 @@ static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy)
 	struct amd_cpudata *cpudata;
 	union perf_cached perf;
 	struct device *dev;
+	int default_epp;
 	int ret;
 
 	/*
@@ -1925,6 +1929,13 @@ static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy)
 
 	policy->boost_supported = READ_ONCE(cpudata->boost_supported);
 
+	/* Fetch the firmware programmed default EPP value */
+	default_epp = amd_pstate_get_epp(cpudata);
+	if (default_epp < 0) {
+		ret = default_epp;
+		goto free_cpudata1;
+	}
+
 	/*
 	 * Set the policy to provide a valid fallback value in case
 	 * the default cpufreq governor is neither powersave nor performance.
@@ -1932,7 +1943,7 @@ static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy)
 	if (amd_pstate_acpi_pm_profile_server() ||
 	    amd_pstate_acpi_pm_profile_undefined()) {
 		policy->policy = CPUFREQ_POLICY_PERFORMANCE;
-		cpudata->epp_default_ac = cpudata->epp_default_dc = amd_pstate_get_epp(cpudata);
+		cpudata->epp_default_ac = cpudata->epp_default_dc = default_epp;
 		cpudata->current_profile = PLATFORM_PROFILE_PERFORMANCE;
 	} else {
 		policy->policy = CPUFREQ_POLICY_POWERSAVE;
diff --git a/drivers/cpufreq/amd-pstate.h b/drivers/cpufreq/amd-pstate.h
--- a/drivers/cpufreq/amd-pstate.h
+++ b/drivers/cpufreq/amd-pstate.h
@@ -32,6 +32,7 @@
  * @min_limit_perf: Cached value of the performance corresponding to policy->min
  * @max_limit_perf: Cached value of the performance corresponding to policy->max
  * @bios_min_perf: Cached perf value corresponding to the "Requested CPU Min Frequency" BIOS option
+ * @val: Raw 64-bit value for atomic access via READ_ONCE()/WRITE_ONCE()
  */
 union perf_cached {
 	struct {
@@ -89,7 +90,12 @@ struct amd_aperf_mperf {
  * @epp_default_ac: Default EPP value for AC power source
  * @epp_default_dc: Default EPP value for DC power source
  * @dynamic_epp: Whether dynamic EPP is enabled
+ * @raw_epp: Whether the last EPP write was a raw numeric value rather than a
+ *	     named preference
  * @power_nb: Notifier block for power events
+ * @current_profile: Currently selected platform profile option
+ * @ppdev: Device registered with the platform profile handler
+ * @profile_name: Name under which @ppdev is registered
  *
  * The amd_cpudata is key private data for each CPU thread in AMD P-State, and
  * represents all the attributes and goals that AMD P-State requests at runtime.