diff --git a/src/drivers/intel/gma/opregion.c b/src/drivers/intel/gma/opregion.c
index 566f351..7682af1 100644
--- a/src/drivers/intel/gma/opregion.c
+++ b/src/drivers/intel/gma/opregion.c
@@ -57,7 +57,7 @@
 }
 
 /* Write ASLS PCI register and prepare SWSCI register. */
-void intel_gma_opregion_register(uintptr_t opregion)
+static void intel_gma_opregion_register(uintptr_t opregion)
 {
 	struct device *igd;
 	u16 reg16;
@@ -94,17 +94,16 @@
 }
 
 /* Restore ASLS register on S3 resume and prepare SWSCI. */
-void intel_gma_restore_opregion(void)
+static enum cb_err intel_gma_restore_opregion(void)
 {
-	if (acpi_is_wakeup_s3()) {
-		const void *const gnvs = cbmem_find(CBMEM_ID_ACPI_GNVS);
-		uintptr_t aslb;
-
-		if (gnvs && (aslb = gma_get_gnvs_aslb(gnvs)))
-			intel_gma_opregion_register(aslb);
-		else
-			printk(BIOS_ERR, "Error: GNVS or ASLB not set.\n");
+	const igd_opregion_t *const opregion = cbmem_find(CBMEM_ID_IGD_OPREGION);
+	if (!opregion) {
+		printk(BIOS_ERR, "GMA: Failed to find IGD OpRegion.\n");
+		return CB_ERR;
 	}
+	/* Write ASLS PCI register and prepare SWSCI register. */
+	intel_gma_opregion_register((uintptr_t)opregion);
+	return CB_SUCCESS;
 }
 
 static enum cb_err vbt_validate(struct region_device *rdev)
@@ -224,14 +223,17 @@
 }
 
 /* Initialize IGD OpRegion, called from ACPI code and OS drivers */
-enum cb_err
-intel_gma_init_igd_opregion(igd_opregion_t *opregion)
+enum cb_err intel_gma_init_igd_opregion(void)
 {
+	igd_opregion_t *opregion;
 	struct region_device rdev;
 	optionrom_vbt_t *vbt = NULL;
 	optionrom_vbt_t *ext_vbt;
 	bool found = false;
 
+	if (acpi_is_wakeup_s3())
+		return intel_gma_restore_opregion();
+
 	/* Search for vbt.bin in CBFS. */
 	if (locate_vbt_cbfs(&rdev) == CB_SUCCESS &&
 	    vbt_validate(&rdev) == CB_SUCCESS) {
@@ -273,6 +275,12 @@
 		return CB_ERR;
 	}
 
+	opregion = cbmem_add(CBMEM_ID_IGD_OPREGION, sizeof(*opregion));
+	if (!opregion) {
+		printk(BIOS_ERR, "GMA: Failed to add IGD OpRegion to CBMEM.\n");
+		return CB_ERR;
+	}
+
 	memset(opregion, 0, sizeof(igd_opregion_t));
 
 	memcpy(&opregion->header.signature, IGD_OPREGION_SIGNATURE,