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arch/arm/src/stm32{h7,f7,l4}: add 4-bit wide bus support for MMC/eMMC cards

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The STM32H7, STM32F7, STM32L4 and common STM32 SDIO/SDMMC drivers failed
to program the WIDBUS bits when switching MMC/eMMC cards to 4-bit mode,
and the MMC transfer clock presets were hardwired to 1-bit bus width.

Add CLOCK_MMC_TRANSFER_4BIT to the common SDIO clock enum, add 4-bit
MMC clock presets, and update stm32_widebus() to use modifyreg32/
sdmmc_modifyreg32 to set the host controller bus width.

Signed-off-by: DuoYuWang <thirteenking.wang@gmail.com>
This commit is contained in:
DuoYuWang 2026-07-21 07:29:52 +08:00 • committed by Alan C. Assis
parent 85ad737463
commit 82ab33aed6
5 changed files with 72 additions and 2 deletions
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5
include/nuttx/sdio.h
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@ -942,9 +942,10 @@ enum sdio_clock_e
{
CLOCK_SDIO_DISABLED = 0, /* Clock is disabled */
CLOCK_IDMODE, /* Initial ID mode clocking (<400KHz) */
CLOCK_MMC_TRANSFER, /* MMC normal operation clocking */
CLOCK_MMC_TRANSFER, /* MMC normal operation clocking (narrow 1-bit mode) */
CLOCK_SD_TRANSFER_1BIT, /* SD normal operation clocking (narrow 1-bit mode) */
CLOCK_SD_TRANSFER_4BIT /* SD normal operation clocking (wide 4-bit mode) */
CLOCK_SD_TRANSFER_4BIT, /* SD normal operation clocking (wide 4-bit mode) */
CLOCK_MMC_TRANSFER_4BIT /* MMC normal operation clocking (wide 4-bit mode) */
};
/* Event set. A uint8_t is big enough to hold a set of 8-events. If more