diff options
| author | Patrick Delaunay <patrick.delaunay@st.com> | 2018-02-07 17:19:58 +0100 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2018-03-13 21:45:37 -0400 |
| commit | a72dd8ed95992be67a03073dd28dad27618e5a39 (patch) | |
| tree | 6a6322b3be4e51d4195d8b6f4a70e51fbd0b33c0 /drivers/mmc/stm32_sdmmc2.c | |
| parent | aa5e3e22f4d648c09b6b63eac8eec8d7a2fc2994 (diff) | |
mmc: stm32: sdmmc2: add hardware flow control support
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>
Diffstat (limited to 'drivers/mmc/stm32_sdmmc2.c')
| -rw-r--r-- | drivers/mmc/stm32_sdmmc2.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/mmc/stm32_sdmmc2.c b/drivers/mmc/stm32_sdmmc2.c index bd2200a05c..3e578359e0 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; } |