From: Mario Six mario.six@gdsys.cc
Minize the time the adapter is disabled (via SPI_MODE_EN clearing/setting) to just the character length setting, and only set up the temporary data writing variable right before we need it, so there is a more clear distinction between setting up the SPI adapter, and setting up the data to be written.
Signed-off-by: Mario Six mario.six@gdsys.cc --- drivers/spi/mpc8xxx_spi.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/spi/mpc8xxx_spi.c b/drivers/spi/mpc8xxx_spi.c index 1dd5bd9799..1e7c0144c2 100644 --- a/drivers/spi/mpc8xxx_spi.c +++ b/drivers/spi/mpc8xxx_spi.c @@ -116,9 +116,6 @@ int spi_xfer(struct spi_slave *slave, uint bitlen, const void *dout, void *din, u32 tmpdout = 0; uchar xfer_bitlen = (bitlen >= 32 ? 32 : bitlen);
- /* Shift data so it's msb-justified */ - tmpdout = *(u32 *)dout >> (32 - xfer_bitlen); - clrbits_be32(&spi->mode, SPI_MODE_EN);
/* Set up length for this transfer */ @@ -130,14 +127,17 @@ int spi_xfer(struct spi_slave *slave, uint bitlen, const void *dout, void *din, else /* more than 16 bits -> full 32 bit transfer */ set_char_len(spi, 0);
+ setbits_be32(&spi->mode, SPI_MODE_EN); + + /* Shift data so it's msb-justified */ + tmpdout = *(u32 *)dout >> (32 - xfer_bitlen); + if (bitlen > 16) { /* Set up the next iteration if sending > 32 bits */ bitlen -= 32; dout += 4; }
- setbits_be32(&spi->mode, SPI_MODE_EN); - /* Write the data out */ out_be32(&spi->tx, tmpdout);