diff --git a/zephyr/lib/cpu.c b/zephyr/lib/cpu.c
index 768dc5192..86a6169a6 100644
--- a/zephyr/lib/cpu.c
+++ b/zephyr/lib/cpu.c
@@ -28,12 +28,8 @@
 extern K_KERNEL_STACK_ARRAY_DEFINE(z_interrupt_stacks, CONFIG_MP_MAX_NUM_CPUS,
 				   CONFIG_ISR_STACK_SIZE);
 
-static atomic_t ready_flag;
-
 static void secondary_init(void *arg)
 {
-	atomic_set(&ready_flag, 1);
-
 	secondary_core_init(sof_get());
 }
 
@@ -86,13 +82,8 @@ void cpu_notify_state_exit(enum pm_state state)
 {
 	if (state == PM_STATE_SOFT_OFF)	{
 #if CONFIG_MULTICORE
-		if (!cpu_is_primary(arch_proc_id())) {
-			/* Notifying primary core that secondary core successfully exit the D3
-			 * state and is back in the Idle thread.
-			 */
-			atomic_set(&ready_flag, 1);
+		if (!cpu_is_primary(arch_proc_id()))
 			return;
-		}
 #endif
 
 #ifdef CONFIG_ADSP_IMR_CONTEXT_SAVE
@@ -132,16 +123,11 @@ int cpu_enable_core(int id)
 		cpu_resume = false;
 #endif
 
-	atomic_clear(&ready_flag);
-
 	if (cpu_resume)
-		k_smp_cpu_resume(id, secondary_init, NULL, true);
+		k_smp_cpu_resume(id, secondary_init, NULL);
 	else
 		k_smp_cpu_start(id, secondary_init, NULL);
 
-	while (!atomic_get(&ready_flag))
-		k_busy_wait(100);
-
 	return 0;
 }