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authorIra W. Snyder <iws@ovro.caltech.edu>2012-09-12 14:17:31 -0700
committerKim Phillips <kim.phillips@freescale.com>2012-09-18 16:16:44 -0500
commitf138ca1373d7ec9fca33ae21f1b5ff3898fd493f (patch)
tree63e0692473301f5af7d910741bc1bff7614d4b3d /drivers/spi
parent037e9d33db9fc86c1e671d64077b2d1a19df7f24 (diff)
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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 <iws@ovro.caltech.edu> Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/mpc8xxx_spi.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/spi/mpc8xxx_spi.c b/drivers/spi/mpc8xxx_spi.c
index 44ab39d..4e46041 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);