[Patch] atmel_spi.c - let transfers through if not changing bits_per_word

[Matthias Brugger <matthias.bgg@gmail.com>]

- bits_per_word option in spi_transfer are allowed if it does not change
the csr register.

This is necessary for the driver in
drivers/staging/iio/adis16260_core.c, as it uses this option.

Signed-off-by: Matthias Brugger <mensch0815@gmail.com>
---
 drivers/spi/atmel_spi.c |   14 +++++++++++++-
 1 files changed, 13 insertions(+), 1 deletions(-)

diff --git a/drivers/spi/atmel_spi.c b/drivers/spi/atmel_spi.c
index c4e0442..5c03a5b 100644
--- a/drivers/spi/atmel_spi.c
+++ b/drivers/spi/atmel_spi.c
@@ -654,6 +654,8 @@ static int atmel_spi_transfer(struct spi_device
*spi, struct spi_message *msg)
 	struct spi_transfer	*xfer;
 	unsigned long		flags;
 	struct device		*controller = spi->master->dev.parent;
+	u8			bits;
+	struct atmel_spi_device	*asd;

 	as = spi_master_get_devdata(spi->master);

@@ -672,8 +674,18 @@ static int atmel_spi_transfer(struct spi_device
*spi, struct spi_message *msg)
 			return -EINVAL;
 		}

+		if (xfer->bits_per_word) {
+			asd = spi->controller_state;
+			bits = (asd->csr >> 4) & 0xf;
+			if (bits != xfer->bits_per_word - 8) {
+				dev_dbg(&spi->dev, "you can't yet change "
+					 "bit_per_word in transfers\n");
+				return -ENOPROTOOPT;
+			}
+		}
+
 		/* FIXME implement these protocol options!! */
-		if (xfer->bits_per_word || xfer->speed_hz) {
+		if (xfer->speed_hz) {
 			dev_dbg(&spi->dev, "no protocol options yet\n");
 			return -ENOPROTOOPT;
 		}
-- 
1.5.6.5