The davinci spi driver provides an option to use DMA transfers for data. In the dma_map_single() call, the driver is passing the number of words to be transfered for the mapping size. It should be the number of bytes.
Signed-off-by: Michael Williamson <[email protected]> --- Note: I only have 8 bit devices to test with, so I can only confirm this patch does not break such a configuration. drivers/spi/davinci_spi.c | 10 +++++----- 1 files changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/spi/davinci_spi.c b/drivers/spi/davinci_spi.c index 166a879..037ba82 100644 --- a/drivers/spi/davinci_spi.c +++ b/drivers/spi/davinci_spi.c @@ -591,10 +591,10 @@ static int davinci_spi_bufs(struct spi_device *spi, struct spi_transfer *t) if (t->tx_buf) { t->tx_dma = dma_map_single(&spi->dev, (void *)t->tx_buf, - dspi->wcount, DMA_TO_DEVICE); + t->len, DMA_TO_DEVICE); if (dma_mapping_error(&spi->dev, t->tx_dma)) { dev_dbg(sdev, "Unable to DMA map %d bytes" - "TX buffer\n", dspi->wcount); + "TX buffer\n", t->len); return -ENOMEM; } } @@ -624,7 +624,7 @@ static int davinci_spi_bufs(struct spi_device *spi, struct spi_transfer *t) if (t->rx_buf) { rx_buf = t->rx_buf; - rx_buf_count = dspi->rcount; + rx_buf_count = t->len; } else { rx_buf = dspi->rx_tmp_buf; rx_buf_count = sizeof(dspi->rx_tmp_buf); @@ -636,7 +636,7 @@ static int davinci_spi_bufs(struct spi_device *spi, struct spi_transfer *t) dev_dbg(sdev, "Couldn't DMA map a %d bytes RX buffer\n", rx_buf_count); if (t->tx_buf) - dma_unmap_single(NULL, t->tx_dma, dspi->wcount, + dma_unmap_single(NULL, t->tx_dma, t->len, DMA_TO_DEVICE); return -ENOMEM; } @@ -675,7 +675,7 @@ static int davinci_spi_bufs(struct spi_device *spi, struct spi_transfer *t) if (spicfg->io_type == SPI_IO_TYPE_DMA) { if (t->tx_buf) - dma_unmap_single(NULL, t->tx_dma, dspi->wcount, + dma_unmap_single(NULL, t->tx_dma, t->len, DMA_TO_DEVICE); dma_unmap_single(NULL, t->rx_dma, rx_buf_count, -- 1.7.0.4 _______________________________________________ Davinci-linux-open-source mailing list [email protected] http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
