diff --git a/plat/st/stm32mp1/stm32mp1_syscfg.c b/plat/st/stm32mp1/stm32mp1_syscfg.c
index 8edf338..39ad90b 100644
--- a/plat/st/stm32mp1/stm32mp1_syscfg.c
+++ b/plat/st/stm32mp1/stm32mp1_syscfg.c
@@ -4,12 +4,16 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
+#include <assert.h>
+#include <errno.h>
+
 #include <common/debug.h>
 #include <drivers/clk.h>
 #include <drivers/delay_timer.h>
 #include <drivers/st/stpmic1.h>
 #include <lib/mmio.h>
 #include <lib/utils_def.h>
+#include <libfdt.h>
 
 #include <platform_def.h>
 #include <stm32mp_common.h>
@@ -34,6 +38,7 @@
 #define SYSCFG_CMPSD2CR				0x40U
 #define SYSCFG_CMPSD2ENSETR			0x44U
 #define SYSCFG_CMPSD2ENCLRR			0x48U
+#define SYSCFG_HSLVEN0R				0x50U
 #endif
 #define SYSCFG_IDC				0x380U
 
@@ -81,6 +86,25 @@
 #define SYSCFG_CMPENSETR_MPU_EN			BIT(0)
 
 /*
+ * HSLV definitions
+ */
+#define HSLV_IDX_TPIU				0U
+#define HSLV_IDX_QSPI				1U
+#define HSLV_IDX_ETH1				2U
+#define HSLV_IDX_ETH2				3U
+#define HSLV_IDX_SDMMC1				4U
+#define HSLV_IDX_SDMMC2				5U
+#define HSLV_IDX_SPI1				6U
+#define HSLV_IDX_SPI2				7U
+#define HSLV_IDX_SPI3				8U
+#define HSLV_IDX_SPI4				9U
+#define HSLV_IDX_SPI5				10U
+#define HSLV_IDX_LTDC				11U
+#define HSLV_NB_IDX				12U
+
+#define HSLV_KEY				0x1018U
+
+/*
  * SYSCFG_IDC Register
  */
 #define SYSCFG_IDC_DEV_ID_MASK			GENMASK(11, 0)
@@ -126,8 +150,99 @@
 	mmio_setbits_32(SYSCFG_BASE + cmpcr_off + CMPCR_CMPENCLRR_OFFSET, SYSCFG_CMPENSETR_MPU_EN);
 }
 
+#if STM32MP13
+static int get_regu_max_voltage(void *fdt, int sdmmc_node,
+				const char *regu_name, uint32_t *regu_val)
+{
+	int node;
+	const fdt32_t *cuint;
+
+	cuint = fdt_getprop(fdt, sdmmc_node, regu_name, NULL);
+	if (cuint == NULL) {
+		return -ENODEV;
+	}
+
+	node = fdt_node_offset_by_phandle(fdt, fdt32_to_cpu(*cuint));
+	if (node < 0) {
+		return -ENODEV;
+	}
+
+	cuint = fdt_getprop(fdt, node, "regulator-max-microvolt", NULL);
+	if (cuint == NULL) {
+		return -ENODEV;
+	}
+
+	*regu_val = fdt32_to_cpu(*cuint);
+
+	return 0;
+}
+
+static bool sdmmc_is_low_voltage(uintptr_t sdmmc_base)
+{
+	int ret;
+	int node;
+	void *fdt = NULL;
+	uint32_t regu_max_val;
+
+	if (fdt_get_address(&fdt) == 0) {
+		return false;
+	}
+
+	if (fdt == NULL) {
+		return false;
+	}
+
+	node = dt_match_instance_by_compatible(DT_SDMMC2_COMPAT, sdmmc_base);
+	if (node < 0) {
+		/* No SD or eMMC device on this instance, enable HSLV */
+		return true;
+	}
+
+	ret = get_regu_max_voltage(fdt, node, "vqmmc-supply", &regu_max_val);
+	if ((ret < 0) || (regu_max_val > 1800000U)) {
+		/*
+		 * The vqmmc-supply property should always be present for eMMC.
+		 * For SD-card, if it is not, then the card only supports 3.3V.
+		 */
+		return false;
+	}
+
+	return true;
+}
+
+static void enable_hslv_by_index(uint32_t index)
+{
+	bool apply_hslv;
+
+	assert(index < HSLV_NB_IDX);
+
+	switch (index) {
+	case HSLV_IDX_SDMMC1:
+		apply_hslv = sdmmc_is_low_voltage(STM32MP_SDMMC1_BASE);
+		break;
+	case HSLV_IDX_SDMMC2:
+		apply_hslv = sdmmc_is_low_voltage(STM32MP_SDMMC2_BASE);
+		break;
+	default:
+		apply_hslv = true;
+		break;
+	}
+
+	if (apply_hslv) {
+		mmio_write_32(SYSCFG_BASE + SYSCFG_HSLVEN0R + index * sizeof(uint32_t), HSLV_KEY);
+	}
+}
+#endif
+
 static void enable_high_speed_mode_low_voltage(void)
 {
+#if STM32MP13
+	uint32_t idx;
+
+	for (idx = 0U; idx < HSLV_NB_IDX; idx++) {
+		enable_hslv_by_index(idx);
+	}
+#endif
 #if STM32MP15
 	mmio_write_32(SYSCFG_BASE + SYSCFG_IOCTRLSETR,
 		      SYSCFG_IOCTRLSETR_HSLVEN_TRACE |