diff options
| -rw-r--r-- | drivers/spi/spi-davinci.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/spi/spi-davinci.c b/drivers/spi/spi-davinci.c index 1e24395a04f2..ca122165a3c6 100644 --- a/drivers/spi/spi-davinci.c +++ b/drivers/spi/spi-davinci.c @@ -655,6 +655,12 @@ static int davinci_spi_bufs(struct spi_device *spi, struct spi_transfer *t) if (!rxdesc) goto err_desc; + if (!t->tx_buf) { + /* use rx buffer as dummy tx buffer */ + t->tx_sg.sgl = t->rx_sg.sgl; + t->tx_sg.nents = t->rx_sg.nents; + } + txdesc = dmaengine_prep_slave_sg(dspi->dma_tx, t->tx_sg.sgl, t->tx_sg.nents, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); @@ -957,7 +963,7 @@ static int davinci_spi_probe(struct platform_device *pdev) master->bus_num = pdev->id; master->num_chipselect = pdata->num_chipselect; master->bits_per_word_mask = SPI_BPW_RANGE_MASK(2, 16); - master->flags = (SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX); + master->flags = SPI_MASTER_MUST_RX; master->setup = davinci_spi_setup; master->cleanup = davinci_spi_cleanup; master->can_dma = davinci_spi_can_dma; |