diff options
Diffstat (limited to 'drivers/spi/spi.c')
| -rw-r--r-- | drivers/spi/spi.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 1587a4a5ff4..f1217ae59f3 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1204,7 +1204,7 @@ EXPORT_SYMBOL_GPL(spi_busnum_to_master); int spi_setup(struct spi_device *spi) { unsigned bad_bits; - int status; + int status = 0; /* help drivers fail *cleanly* when they need options * that aren't supported with their current master @@ -1219,7 +1219,8 @@ int spi_setup(struct spi_device *spi) if (!spi->bits_per_word) spi->bits_per_word = 8; - status = spi->master->setup(spi); + if (spi->master->setup) + status = spi->master->setup(spi); dev_dbg(&spi->dev, "setup mode %d, %s%s%s%s" "%u bits/w, %u Hz max --> %d\n", @@ -1238,6 +1239,7 @@ EXPORT_SYMBOL_GPL(spi_setup); static int __spi_async(struct spi_device *spi, struct spi_message *message) { struct spi_master *master = spi->master; + struct spi_transfer *xfer; /* Half-duplex links include original MicroWire, and ones with * only one data pin like SPI_3WIRE (switches direction) or where @@ -1246,7 +1248,6 @@ static int __spi_async(struct spi_device *spi, struct spi_message *message) */ if ((master->flags & SPI_MASTER_HALF_DUPLEX) || (spi->mode & SPI_3WIRE)) { - struct spi_transfer *xfer; unsigned flags = master->flags; list_for_each_entry(xfer, &message->transfers, transfer_list) { @@ -1259,6 +1260,15 @@ static int __spi_async(struct spi_device *spi, struct spi_message *message) } } + /** + * Set transfer bits_per_word as spi device default if it is not + * set for this transfer. + */ + list_for_each_entry(xfer, &message->transfers, transfer_list) { + if (!xfer->bits_per_word) + xfer->bits_per_word = spi->bits_per_word; + } + message->spi = spi; message->status = -EINPROGRESS; return master->transfer(spi, message); |