From f138ca1373d7ec9fca33ae21f1b5ff3898fd493f Mon Sep 17 00:00:00 2001 From: "Ira W. Snyder" Date: Wed, 12 Sep 2012 14:17:31 -0700 Subject: [PATCH] mpc8xxx_spi: fix SPI support on MPC8308RDB The MPC8308RDB Reference Manual states that no bits in the SPMODE register are allowed to change while the enable (EN) bit is set. This driver changes the character length bits (LEN) while the enable (EN) bit is set. Clearing the EN bit while changing the LEN bits makes the driver work correctly on MPC8308RDB. Signed-off-by: Ira W. Snyder Signed-off-by: Kim Phillips --- drivers/spi/mpc8xxx_spi.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/spi/mpc8xxx_spi.c b/drivers/spi/mpc8xxx_spi.c index 44ab39dd3f..4e46041dff 100644 --- a/drivers/spi/mpc8xxx_spi.c +++ b/drivers/spi/mpc8xxx_spi.c @@ -124,6 +124,8 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, * len > 16 0 */ + spi->mode &= ~SPI_MODE_EN; + if (bitlen <= 16) { if (bitlen <= 4) spi->mode = (spi->mode & 0xff0fffff) | @@ -138,6 +140,8 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, dout += 4; } + spi->mode |= SPI_MODE_EN; + spi->tx = tmpdout; /* Write the data out */ debug("*** spi_xfer: ... %08x written\n", tmpdout); -- 2.25.1