diff options
| -rw-r--r-- | drivers/spi/spi-fsl-dspi.c | 35 |
1 files changed, 18 insertions, 17 deletions
diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c index 22f7ce1279bd..cb41c327bd77 100644 --- a/drivers/spi/spi-fsl-dspi.c +++ b/drivers/spi/spi-fsl-dspi.c @@ -151,6 +151,7 @@ static const struct fsl_dspi_devtype_data ls2085a_data = { }; struct fsl_dspi_dma { + /* Length of transfer in words of DSPI_FIFO_SIZE */ u32 curr_xfer_len; u32 *tx_dma_buf; @@ -217,15 +218,13 @@ static void dspi_rx_dma_callback(void *arg) struct fsl_dspi *dspi = arg; struct fsl_dspi_dma *dma = dspi->dma; int rx_word; - int i, len; + int i; u16 d; rx_word = is_double_byte_mode(dspi); - len = rx_word ? (dma->curr_xfer_len / 2) : dma->curr_xfer_len; - if (!(dspi->dataflags & TRAN_STATE_RX_VOID)) { - for (i = 0; i < len; i++) { + for (i = 0; i < dma->curr_xfer_len; i++) { d = dspi->dma->rx_dma_buf[i]; rx_word ? (*(u16 *)dspi->rx = d) : (*(u8 *)dspi->rx = d); @@ -242,14 +241,12 @@ static int dspi_next_xfer_dma_submit(struct fsl_dspi *dspi) struct device *dev = &dspi->pdev->dev; int time_left; int tx_word; - int i, len; + int i; u16 val; tx_word = is_double_byte_mode(dspi); - len = tx_word ? (dma->curr_xfer_len / 2) : dma->curr_xfer_len; - - for (i = 0; i < len - 1; i++) { + for (i = 0; i < dma->curr_xfer_len - 1; i++) { val = tx_word ? *(u16 *) dspi->tx : *(u8 *) dspi->tx; dspi->dma->tx_dma_buf[i] = SPI_PUSHR_TXDATA(val) | SPI_PUSHR_PCS(dspi->cs) | @@ -265,7 +262,9 @@ static int dspi_next_xfer_dma_submit(struct fsl_dspi *dspi) dma->tx_desc = dmaengine_prep_slave_single(dma->chan_tx, dma->tx_dma_phys, - DSPI_DMA_BUFSIZE, DMA_MEM_TO_DEV, + dma->curr_xfer_len * + DMA_SLAVE_BUSWIDTH_4_BYTES, + DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (!dma->tx_desc) { dev_err(dev, "Not able to get desc for DMA xfer\n"); @@ -281,7 +280,9 @@ static int dspi_next_xfer_dma_submit(struct fsl_dspi *dspi) dma->rx_desc = dmaengine_prep_slave_single(dma->chan_rx, dma->rx_dma_phys, - DSPI_DMA_BUFSIZE, DMA_DEV_TO_MEM, + dma->curr_xfer_len * + DMA_SLAVE_BUSWIDTH_4_BYTES, + DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (!dma->rx_desc) { dev_err(dev, "Not able to get desc for DMA xfer\n"); @@ -328,17 +329,17 @@ static int dspi_dma_xfer(struct fsl_dspi *dspi) struct device *dev = &dspi->pdev->dev; int curr_remaining_bytes; int bytes_per_buffer; - int tx_word; + int word = 1; int ret = 0; - tx_word = is_double_byte_mode(dspi); + if (is_double_byte_mode(dspi)) + word = 2; curr_remaining_bytes = dspi->len; + bytes_per_buffer = DSPI_DMA_BUFSIZE / DSPI_FIFO_SIZE; while (curr_remaining_bytes) { /* Check if current transfer fits the DMA buffer */ - dma->curr_xfer_len = curr_remaining_bytes; - bytes_per_buffer = DSPI_DMA_BUFSIZE / - (DSPI_FIFO_SIZE / (tx_word ? 2 : 1)); - if (curr_remaining_bytes > bytes_per_buffer) + dma->curr_xfer_len = curr_remaining_bytes / word; + if (dma->curr_xfer_len > bytes_per_buffer) dma->curr_xfer_len = bytes_per_buffer; ret = dspi_next_xfer_dma_submit(dspi); @@ -347,7 +348,7 @@ static int dspi_dma_xfer(struct fsl_dspi *dspi) goto exit; } else { - curr_remaining_bytes -= dma->curr_xfer_len; + curr_remaining_bytes -= dma->curr_xfer_len * word; if (curr_remaining_bytes < 0) curr_remaining_bytes = 0; dspi->len = curr_remaining_bytes; |