diff --git a/board/thead/light-c910/lpddr4/include/ddr_retention.h b/board/thead/light-c910/lpddr4/include/ddr_retention.h
index 42eb034f..9e1d34aa 100644
--- a/board/thead/light-c910/lpddr4/include/ddr_retention.h
+++ b/board/thead/light-c910/lpddr4/include/ddr_retention.h
@@ -28,6 +28,8 @@ typedef enum {
 typedef struct Ddr_Reg_Config {
     uint32_t misc_reg_num;
     uint32_t phy_reg_num;
+    uint8_t  ddr_rank;
+    uint8_t  reserve[55];
 } Ddr_Reg_Config_t;
 
 int dwc_ddrphy_phyinit_regInterface(regInstr myRegInstr);
diff --git a/board/thead/light-c910/lpddr4/src/ddr_retention.c b/board/thead/light-c910/lpddr4/src/ddr_retention.c
index eed83aac..bfbe0bf9 100644
--- a/board/thead/light-c910/lpddr4/src/ddr_retention.c
+++ b/board/thead/light-c910/lpddr4/src/ddr_retention.c
@@ -1009,6 +1009,11 @@ int dwc_ddrphy_phyinit_regInterface(regInstr myRegInstr) {
 
     uint32_t phy_reg_num = ARRAY_SIZE(RetRegList_addr);
     ddr_Regu_Config->phy_reg_num = phy_reg_num;
+#ifdef CONFIG_DDR_DUAL_RANK
+    ddr_Regu_Config->ddr_rank   =  2;
+#else
+    ddr_Regu_Config->ddr_rank   =  1;
+#endif
     Reg_Phy_Addr_Val_t* phy_addr_t = (Reg_Phy_Addr_Val_t*)((char*)ddr_Regu_Config +  64 +  sizeof(Reg_Misc_Addr_Val_t) *  ARRAY_SIZE(MiscRegList));
 
 #ifdef CONFIG_DDR_MSG