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spi: fsl_dspi fix to stop extra transmissions

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Update to prevent a byte of zeros being transmitted between
each byte in the tx buffer when providing both a tx buffer
and a rx buffer.

Signed-off-by: Jared Bents <jared.bents@rockwellcollins.com>
Cc: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
Acked-by: Jagan Teki <jagan@amarulasolutions.com>
This commit is contained in:
Jared Bents 2019-03-22 09:46:52 -05:00 committed by Jagan Teki
parent 567a3eb795
commit 40264c0ca8
1 changed files with 26 additions and 4 deletions
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30
drivers/spi/fsl_dspi.c
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@ -273,7 +273,18 @@ static int dspi_xfer(struct fsl_dspi_priv *priv, uint cs, unsigned int bitlen,
if (len > 1) {
int tmp_len = len - 1;
while (tmp_len--) {
if (dout != NULL) {
if ((dout != NULL) && (din != NULL)) {
if (priv->charbit == 16) {
dspi_tx(priv, ctrl, *spi_wr16++);
*spi_rd16++ = dspi_rx(priv);
}
else {
dspi_tx(priv, ctrl, *spi_wr++);
*spi_rd++ = dspi_rx(priv);
}
}
else if (dout != NULL) {
if (priv->charbit == 16)
dspi_tx(priv, ctrl, *spi_wr16++);
else
@ -281,7 +292,7 @@ static int dspi_xfer(struct fsl_dspi_priv *priv, uint cs, unsigned int bitlen,
dspi_rx(priv);
}
if (din != NULL) {
else if (din != NULL) {
dspi_tx(priv, ctrl, DSPI_IDLE_VAL);
if (priv->charbit == 16)
*spi_rd16++ = dspi_rx(priv);
@ -297,7 +308,18 @@ static int dspi_xfer(struct fsl_dspi_priv *priv, uint cs, unsigned int bitlen,
ctrl &= ~DSPI_TFR_CONT;
if (len) {
if (dout != NULL) {
if ((dout != NULL) && (din != NULL)) {
if (priv->charbit == 16) {
dspi_tx(priv, ctrl, *spi_wr16++);
*spi_rd16++ = dspi_rx(priv);
}
else {
dspi_tx(priv, ctrl, *spi_wr++);
*spi_rd++ = dspi_rx(priv);
}
}
else if (dout != NULL) {
if (priv->charbit == 16)
dspi_tx(priv, ctrl, *spi_wr16);
else
@ -305,7 +327,7 @@ static int dspi_xfer(struct fsl_dspi_priv *priv, uint cs, unsigned int bitlen,
dspi_rx(priv);
}
if (din != NULL) {
else if (din != NULL) {
dspi_tx(priv, ctrl, DSPI_IDLE_VAL);
if (priv->charbit == 16)
*spi_rd16 = dspi_rx(priv);