driver: spi: Modify core to compute the message length

Make spi core calculate the message length while
populating the other transfer parameters.

Usecase, driver can use it to populate framelength filed in their
controller.

Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Huang Shijie <b32955@freescale.com>

2 files changed, 2 insertions, 0 deletions

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 84f742c0d703..e380e79e57cc 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1377,6 +1377,7 @@ static int __spi_async(struct spi_device *spi, struct spi_message *message)
          * it is not set for this transfer.
          */
         list_for_each_entry(xfer, &message->transfers, transfer_list) {
+                message->frame_length += xfer->len;
                 if (!xfer->bits_per_word)
                         xfer->bits_per_word = spi->bits_per_word;
                 if (!xfer->speed_hz)
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index cdf668156154..be40c977df07 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -584,6 +584,7 @@ struct spi_message {
         /* completion is reported through a callback */
         void                    (*complete)(void *context);
         void                    *context;
+        unsigned                frame_length;
         unsigned                actual_length;
         int                     status;