diff --git a/drivers/media/platform/rockchip/isp/rkisp.c b/drivers/media/platform/rockchip/isp/rkisp.c
index e3dc1859f0b0..c326e87ebbee 100644
--- a/drivers/media/platform/rockchip/isp/rkisp.c
+++ b/drivers/media/platform/rockchip/isp/rkisp.c
@@ -566,9 +566,10 @@ void rkisp_trigger_read_back(struct rkisp_device *dev, u8 dma2frm, u32 mode, boo
 			rkisp_set_bits(dev, MI_WR_CTRL2, 0, val, true);
 			rkisp_write(dev, MI_WR_INIT, ISP21_SP_FORCE_UPD | ISP21_MP_FORCE_UPD, true);
 			/* sensor mode & index */
-			rkisp_set_bits(dev, ISP_ACQ_H_OFFS, ISP21_SENSOR_MODE(3) | ISP21_SENSOR_INDEX(3),
-					ISP21_SENSOR_MODE(hw->dev_num >= 3 ? 2 : hw->dev_num - 1) |
-					ISP21_SENSOR_INDEX(dev->dev_id), true);
+			val = rkisp_read_reg_cache(dev, ISP_ACQ_H_OFFS);
+			val |= ISP21_SENSOR_MODE(hw->dev_num >= 3 ? 2 : hw->dev_num - 1) |
+				ISP21_SENSOR_INDEX(dev->dev_id);
+			writel(val, hw->base_addr + ISP_ACQ_H_OFFS);
 		}
 		is_upd = true;
 	}