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-rw-r--r--drivers/spi/atmel_spi.c14
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;
}
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