How to operate with eMMC in High Speed mode on stm32h750?

[VVi.1701]

Hi, i am using stm32h750 with eMMC Kingston EMMC16G-W525-E01U, as mass storage device. MCU and eMMC operates from 3.3V.

I can put eMMC to 8-bit mode and it works ok, but maximum clock speed in 8-bit mode is 25 MHz. If i set clock speed more than 25 MHz, device is not working.

In eMMC datasheet i found that it support high speed mode at 3.3V with 8-bit wide bus, at maximum clock 52 MHz.

Also in "Getting started with STM32H7 Series SDMMC host controller" application note, i found that stm32h7 support high speed mode at 3.3V with 8-bit wide bus, at maximum clock 52 MHz.

May be i have some errors in code that configures eMMC in high speed mode?

eMMC initialization function:

uint8_t BSP_MMC_Init(void)
{
	HAL_MMC_MspDeInit(&hmmc2);
	uint8_t mmc_state = MMC_OK;
	eMMC_reset();
 
	hmmc2.Instance = SDMMC2;
	hmmc2.Init.ClockEdge = SDMMC_CLOCK_EDGE_RISING;
	hmmc2.Init.ClockPowerSave = SDMMC_CLOCK_POWER_SAVE_DISABLE;
	hmmc2.Init.BusWide = SDMMC_BUS_WIDE_1B;
	hmmc2.Init.HardwareFlowControl = SDMMC_HARDWARE_FLOW_CONTROL_DISABLE;
	hmmc2.Init.ClockDiv = 2;
	hmmc2.Init.TranceiverPresent = SDMMC_TRANSCEIVER_NOT_PRESENT;
 
        if (HAL_MMC_Init(&hmmc2) != HAL_OK)
	{
		mmc_state = MMC_ERROR;
	}
 
	if(HAL_MMC_ConfigWideBusOperation(&hmmc2, SDMMC_BUS_WIDE_8B) != HAL_OK){
		mmc_state = MMC_ERROR;
		printf("HAL_MMC_ConfigWideBusOperation() Error");
	}
 
	if(HAL_MMC_ConfigSpeedBusOperation(&hmmc2, SDMMC_SPEED_MODE_HIGH) != HAL_OK){
		  mmc_state = MMC_ERROR;
		  printf("HAL_MMC_ConfigSpeedBusOperation() Error");
	 }
	return mmc_state;
}

I attached screenshots from datasheet, application note.