diff options
| author | Fabio Estevam | 2012-11-15 11:23:23 +0000 |
|---|---|---|
| committer | Stefano Babic | 2012-11-19 08:49:00 +0100 |
| commit | de5bf02cb1f61de0c65a539cd0083ac8ab07ec50 (patch) | |
| tree | 1e6c7fc5617a0714e43528e7a09578e784b146d5 /drivers/spi/mxc_spi.c | |
| parent | 081237c1f7e7a177bb2e761ee5678d08c345865d (diff) | |
spi: mxc_spi: Fix handling of chip select
In decode_cs() function the polarity of the chip select must be taken into
account.
Also, for the case of low active chip select, the CS was activated too early.
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Diffstat (limited to 'drivers/spi/mxc_spi.c')
| -rw-r--r-- | drivers/spi/mxc_spi.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/spi/mxc_spi.c b/drivers/spi/mxc_spi.c index 13bebe8ac1f..b6bad989527 100644 --- a/drivers/spi/mxc_spi.c +++ b/drivers/spi/mxc_spi.c @@ -387,7 +387,7 @@ static int decode_cs(struct mxc_spi_slave *mxcs, unsigned int cs) if (cs > 3) { mxcs->gpio = cs >> 8; cs &= 3; - ret = gpio_direction_output(mxcs->gpio, 0); + ret = gpio_direction_output(mxcs->gpio, !(mxcs->ss_pol)); if (ret) { printf("mxc_spi: cannot setup gpio %d\n", mxcs->gpio); return -EINVAL; @@ -414,6 +414,8 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, return NULL; } + mxcs->ss_pol = (mode & SPI_CS_HIGH) ? 1 : 0; + ret = decode_cs(mxcs, cs); if (ret < 0) { free(mxcs); @@ -425,7 +427,6 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, mxcs->slave.bus = bus; mxcs->slave.cs = cs; mxcs->base = spi_bases[bus]; - mxcs->ss_pol = (mode & SPI_CS_HIGH) ? 1 : 0; ret = spi_cfg_mxc(mxcs, cs, max_hz, mode); if (ret) { |