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drivers/disk: sdmmc_stm32: Add Hardware FC Kconfig option

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Add a Kconfig symbol to enable use of SDMMC hardware flow control.
In specific cases, this feature could help to avoid FIFO ovderrun
and underrun errors.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
This commit is contained in:
Erwan Gouriou 2021-10-12 14:20:53 +02:00 • committed by Christopher Friedt
commit 9f6246c325
2 changed files with 21 additions and 0 deletions
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8
drivers/disk/Kconfig.sdmmc
View file

@ -51,6 +51,14 @@ config SDMMC_STM32
help
File system on sdmmc accessed through stm32 sdmmc.
config SDMMC_STM32_HWFC
bool "STM32 SDMMC Hardware Flow control"
depends on SDMMC_STM32
depends on SOC_SERIES_STM32H7X || SOC_SERIES_STM32F7X || SOC_SERIES_STM32L4X
help
Enable SDMMC Hardware Flow Control to avoid FIFO underrun (TX mode) and
overrun (RX mode) errors.
module = SDMMC
module-str = sdmmc
source "subsys/logging/Kconfig.template.log_config"

13
drivers/disk/sdmmc_stm32.c
View file

@ -287,6 +287,15 @@ static struct disk_info stm32_sdmmc_info = {
.ops = &stm32_sdmmc_ops,
};
#ifdef CONFIG_SDMMC_STM32_HWFC
static void stm32_sdmmc_fc_enable(struct stm32_sdmmc_priv *priv)
{
MMC_TypeDef *sdmmcx = priv->hsd.Instance;
sdmmcx->CLKCR |= SDMMC_CLKCR_HWFC_EN;
}
#endif
/*
* Check if the card is present or not. If no card detect gpio is set, assume
* the card is present. If reading the gpio fails for some reason, assume the
@ -444,6 +453,10 @@ static int disk_stm32_sdmmc_init(const struct device *dev)
k_sem_init(&priv->thread_lock, 1, 1);
k_sem_init(&priv->sync, 0, 1);
#ifdef CONFIG_SDMMC_STM32_HWFC
stm32_sdmmc_fc_enable(priv);
#endif
err = stm32_sdmmc_card_detect_init(priv);
if (err) {
return err;