diff --git a/arch/arm/include/asm/arch-rockchip/sdram_common.h b/arch/arm/include/asm/arch-rockchip/sdram_common.h
index 2d0be920d9..db9e30126f 100644
--- a/arch/arm/include/asm/arch-rockchip/sdram_common.h
+++ b/arch/arm/include/asm/arch-rockchip/sdram_common.h
@@ -79,6 +79,8 @@ struct sdram_base_params {
 					SYS_REG_NUM_CH_SHIFT)
 #define SYS_REG_RANK_SHIFT(ch)		(11 + (ch) * 16)
 #define SYS_REG_RANK_MASK		1
+#define SYS_REG_ENC_RANK(n, ch)		(((n) - SYS_REG_RANK_MASK) << \
+					 SYS_REG_RANK_SHIFT(ch))
 #define SYS_REG_COL_SHIFT(ch)		(9 + (ch) * 16)
 #define SYS_REG_COL_MASK		3
 #define SYS_REG_BK_SHIFT(ch)		(8 + (ch) * 16)
diff --git a/drivers/ram/rockchip/sdram_rk3399.c b/drivers/ram/rockchip/sdram_rk3399.c
index 874e896369..c2390a771c 100644
--- a/drivers/ram/rockchip/sdram_rk3399.c
+++ b/drivers/ram/rockchip/sdram_rk3399.c
@@ -1091,8 +1091,7 @@ static void dram_all_config(struct dram_info *dram,
 		idx++;
 		sys_reg |= SYS_REG_ENC_ROW_3_4(info->cap_info.row_3_4, channel);
 		sys_reg |= SYS_REG_ENC_CHINFO(channel);
-		sys_reg |= (info->cap_info.rank - 1) <<
-			   SYS_REG_RANK_SHIFT(channel);
+		sys_reg |= SYS_REG_ENC_RANK(info->cap_info.rank, channel);
 		sys_reg |= (info->cap_info.col - 9) <<
 			   SYS_REG_COL_SHIFT(channel);
 		sys_reg |= info->cap_info.bk == 3 ? 0 : 1 <<