Most DM based SPI host controller drivers use SPI_XFER_BEGIN and SPI_XFER_END flags to enable/disable slave chip select.
This patch extends MMC SPI driver to pass SPI_XFER_BEGIN flag when MMC command is send at start and pass SPI_XFER_END flag using a dummy transfer (of bitlen = 0) at the end of MMC command.
Suggested-by: Jagan Teki jagan@amarulasolutions.com Signed-off-by: Anup Patel anup.patel@wdc.com --- drivers/mmc/mmc_spi.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/mmc_spi.c b/drivers/mmc/mmc_spi.c index f3d687ae80..350812a04b 100644 --- a/drivers/mmc/mmc_spi.c +++ b/drivers/mmc/mmc_spi.c @@ -84,7 +84,7 @@ static int mmc_spi_sendcmd(struct udevice *dev, cmdo[4] = cmdarg >> 8; cmdo[5] = cmdarg; cmdo[6] = (crc7(0, &cmdo[1], 5) << 1) | 0x01; - ret = dm_spi_xfer(dev, sizeof(cmdo) * 8, cmdo, NULL, 0); + ret = dm_spi_xfer(dev, sizeof(cmdo) * 8, cmdo, NULL, SPI_XFER_BEGIN); if (ret) return ret;
@@ -360,6 +360,8 @@ static int dm_mmc_spi_request(struct udevice *dev, struct mmc_cmd *cmd, }
done: + dm_spi_xfer(dev, 0, NULL, NULL, SPI_XFER_END); + dm_spi_release_bus(dev);
return ret;