[PATCH v2 4/4] spi: spi-fsl-dspi: Fix adjust the byte order when sending and receiving data

[Chuanhua Han]

This patch fixes the byte order inversion problem in the XSPI mode of
the dspi controller during data transfer.
In XSPI mode,When I read and write data without converting the byte
order of the data, and read and write the data directly, I tested spi
flash connected by the dspi controller and found that the byte
order of the data was reversed by the correct byte order.
When I changed the byte order according to the SPIx_CTARn[LSBFE] flag,
the correct data was obtained.

Signed-off-by: Chuanhua Han <chuanhua....@nxp.com>
---
Changes in v2:
 -The original patch is divided into multiple patches(the original
patch theme is "spi: spi-fsl-dspi: Fix support for XSPI transport
mode"),one of which is segmented.

 drivers/spi/spi-fsl-dspi.c | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c
index 96e790e90997..44cc2bd0120e 100644
--- a/drivers/spi/spi-fsl-dspi.c
+++ b/drivers/spi/spi-fsl-dspi.c
@@ -220,9 +220,15 @@ static u32 dspi_pop_tx(struct fsl_dspi *dspi)
                if (dspi->bytes_per_word == 1)
                        txdata = *(u8 *)dspi->tx;
                else if (dspi->bytes_per_word == 2)
-                       txdata = *(u16 *)dspi->tx;
+                       if (dspi->cur_chip->ctar_val & SPI_CTAR_LSBFE(1))
+                               txdata =  cpu_to_le16(*(u16 *)dspi->tx);
+                       else
+                               txdata =  cpu_to_be16(*(u16 *)dspi->tx);
                else  /* dspi->bytes_per_word == 4 */
-                       txdata = *(u32 *)dspi->tx;
+                       if (dspi->cur_chip->ctar_val & SPI_CTAR_LSBFE(1))
+                               txdata = cpu_to_le32(*(u32 *)dspi->tx);
+                       else
+                               txdata = cpu_to_be32(*(u32 *)dspi->tx);
                dspi->tx += dspi->bytes_per_word;
        }
        dspi->len -= dspi->bytes_per_word;
@@ -246,9 +252,15 @@ static void dspi_push_rx(struct fsl_dspi *dspi, u32 rxdata)
        if (dspi->bytes_per_word == 1)
                *(u8 *)dspi->rx = rxdata;
        else if (dspi->bytes_per_word == 2)
-               *(u16 *)dspi->rx = rxdata;
+               if (dspi->cur_chip->ctar_val & SPI_CTAR_LSBFE(1))
+                       *(u16 *)dspi->rx = be16_to_cpu(rxdata);
+               else
+                       *(u16 *)dspi->rx = be16_to_cpu(rxdata);
        else /* dspi->bytes_per_word == 4 */
-               *(u32 *)dspi->rx = rxdata;
+               if (dspi->cur_chip->ctar_val & SPI_CTAR_LSBFE(1))
+                       *(u32 *)dspi->rx = le32_to_cpu(rxdata);
+               else
+                       *(u32 *)dspi->rx = be32_to_cpu(rxdata);
        dspi->rx += dspi->bytes_per_word;
 }
 
@@ -593,12 +605,12 @@ static void dspi_tcfq_write(struct fsl_dspi *dspi)
                cmd_fifo_write(dspi);
                if (dspi->cur_chip->ctar_val & SPI_CTAR_LSBFE(1)) {
                        /* LSB */
-                       tx_fifo_write(dspi, data & 0xFFFF);
                        tx_fifo_write(dspi, data >> 16);
+                       tx_fifo_write(dspi, data & 0xFFFF);
                } else {
                        /* MSB */
-                       tx_fifo_write(dspi, data >> 16);
                        tx_fifo_write(dspi, data & 0xFFFF);
+                       tx_fifo_write(dspi, data >> 16);
                }
        } else {
                /* Write one entry to both TX FIFO and CMD FIFO
-- 
2.17.1