From: Patrick Delaunay patrick.delaunay@st.com
The hardware flow control functionality is used to avoid FIFO underrun (TX mode) and overrun (RX mode) errors. The behavior is to stop SDMMC_CK during data transfer and freeze the SDMMC state machines.
Signed-off-by: Patrick Delaunay patrick.delaunay@st.com Signed-off-by: Patrice Chotard patrice.chotard@st.com --- drivers/mmc/stm32_sdmmc2.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/stm32_sdmmc2.c b/drivers/mmc/stm32_sdmmc2.c index f3b77f512e85..0fe6808e5dc8 100644 --- a/drivers/mmc/stm32_sdmmc2.c +++ b/drivers/mmc/stm32_sdmmc2.c @@ -495,7 +495,8 @@ static int stm32_sdmmc2_set_ios(struct udevice *dev) if (mmc->bus_width == 8) clk |= SDMMC_CLKCR_WIDBUS_8;
- writel(clk | priv->clk_reg_msk, priv->base + SDMMC_CLKCR); + writel(clk | priv->clk_reg_msk | SDMMC_CLKCR_HWFC_EN, + priv->base + SDMMC_CLKCR);
return 0; }