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authorEugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>2018-03-22 13:50:44 +0300
committerJagan Teki <jagan@amarulasolutions.com>2018-03-22 23:01:35 +0530
commitfc282c7bcb6a622ce1a0cf82c55654dec5bcb0cd (patch)
tree0838cadd25803f9271dc6239a1c21404f221b62f /drivers/spi/designware_spi.c
parentc6b4f031d96a4e1d59761b294829b058b098f3df (diff)
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DW SPI: fix transmit only mode
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>
Diffstat (limited to 'drivers/spi/designware_spi.c')
-rw-r--r--drivers/spi/designware_spi.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/spi/designware_spi.c b/drivers/spi/designware_spi.c
index 5e196b21c9..3296441606 100644
--- a/drivers/spi/designware_spi.c
+++ b/drivers/spi/designware_spi.c
@@ -361,7 +361,11 @@ static int dw_spi_xfer(struct udevice *dev, unsigned int bitlen,
else if (rx)
priv->tmode = SPI_TMOD_RO;
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 |= (priv->tmode << SPI_TMOD_OFFSET);