diff --git a/src/soc/intel/alderlake/include/soc/pmc.h b/src/soc/intel/alderlake/include/soc/pmc.h
index 52cc0b5e1c..ca11ae933a 100644
--- a/src/soc/intel/alderlake/include/soc/pmc.h
+++ b/src/soc/intel/alderlake/include/soc/pmc.h
@@ -142,6 +142,9 @@ extern struct device_operations pmc_ops;
 #define   ACPI_EN			(1 << 7)
 #define   SCI_IRQ_SEL			(7 << 0)
 
+#define ST_PG_FDIS1			0x1e20
+#define   ST_FDIS_LOCK			(1 << 31)
+
 #define  SCIS_IRQ9			0
 #define  SCIS_IRQ10			1
 #define  SCIS_IRQ11			2
diff --git a/src/soc/intel/alderlake/lockdown.c b/src/soc/intel/alderlake/lockdown.c
index b0da51ffdd..5d012d8e1b 100644
--- a/src/soc/intel/alderlake/lockdown.c
+++ b/src/soc/intel/alderlake/lockdown.c
@@ -23,6 +23,9 @@ static void pmc_lockdown_cfg(int chipset_lockdown)
 
 	if (chipset_lockdown == CHIPSET_LOCKDOWN_COREBOOT)
 		setbits32(pmcbase + GEN_PMCON_B, SMI_LOCK);
+
+	if (!CONFIG(USE_FSP_NOTIFY_PHASE_POST_PCI_ENUM))
+		setbits32(pmcbase + ST_PG_FDIS1, ST_FDIS_LOCK);
 }
 
 void soc_lockdown_config(int chipset_lockdown)