spi: make sure all transfer has bits_per_word set

When spi client does the spi transfer and does not sets
the bits_per_word for each transfer then set it as default
of spi device in spi core before calling low level transfer.

Removing the similar code from spi-tegra20-slink driver as
it is not required.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 84c2861d6f4d..518e5955664c 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1190,6 +1190,7 @@ 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
@@ -1198,7 +1199,6 @@ 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) {
@@ -1211,6 +1211,15 @@ 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);