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DW SPI: fix transmit only mode

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In current implementation we get -ETIMEDOUT error when we try to use
transmit only mode (SPI_TMOD_TO)
This happens because in transmit only mode input FIFO never gets any data
which breaks our logic in dw_reader(): we are waiting until RX data will be
ready in dw_reader, but this newer happens, so we return with error.

Fix that by using SPI_TMOD_TR instead of SPI_TMOD_TO which allows to use
RX FIFO.

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
This commit is contained in:
Eugeniy Paltsev 2018-03-22 13:50:44 +03:00 • committed by Jagan Teki
parent c6b4f031d9
commit fc282c7bcb
1 changed files with 5 additions and 1 deletions
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6
drivers/spi/designware_spi.c
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@ -361,7 +361,11 @@ static int dw_spi_xfer(struct udevice *dev, unsigned int bitlen,
else if (rx) else if (rx)
priv->tmode = SPI_TMOD_RO; priv->tmode = SPI_TMOD_RO;
else else
priv->tmode = SPI_TMOD_TO; /*
* In transmit only mode (SPI_TMOD_TO) input FIFO never gets
* any data which breaks our logic in poll_transfer() above.
*/
priv->tmode = SPI_TMOD_TR;
cr0 &= ~SPI_TMOD_MASK; cr0 &= ~SPI_TMOD_MASK;
cr0 |= (priv->tmode << SPI_TMOD_OFFSET); cr0 |= (priv->tmode << SPI_TMOD_OFFSET);