diff --git a/plat/hisilicon/hikey960/hikey960_bl1_setup.c b/plat/hisilicon/hikey960/hikey960_bl1_setup.c
index 6dfada75c..ae33bd24c 100644
--- a/plat/hisilicon/hikey960/hikey960_bl1_setup.c
+++ b/plat/hisilicon/hikey960/hikey960_bl1_setup.c
@@ -519,6 +519,11 @@ static void hikey960_regulator_enable(void)
 	set_audio_power_up();
 	set_pcie_power_up();
 	set_isp_srt_power_up();
+
+	/* set ISP_CORE_CTRL_S to unsecure mode */
+	mmio_write_32(0xe8583800, 0x7);
+	/* set ISP_SUB_CTRL_S to unsecure mode */
+	mmio_write_32(0xe8583804, 0xf);
 }
 
 static void hikey960_ufs_reset(void)