[U-Boot] [PATCH 1/2] mmc: stm32: sdmmc2: add hardware flow control support

[patrice.chotard at st.com]

From: Patrick Delaunay <patrick.delaunay at 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 at st.com>
Signed-off-by: Patrice Chotard <patrice.chotard at 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;
 }
-- 
1.9.1