diff options
Diffstat (limited to 'drivers/spi/spi-fsl-dspi.c')
| -rw-r--r-- | drivers/spi/spi-fsl-dspi.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c index 6bf87ef01c13..3d29285c772c 100644 --- a/drivers/spi/spi-fsl-dspi.c +++ b/drivers/spi/spi-fsl-dspi.c @@ -675,7 +675,18 @@ static int dspi_request_dma(struct fsl_dspi *dspi, phys_addr_t phy_addr) goto err_tx_channel; } - dma->bufsize = PAGE_SIZE; + if (spi_controller_is_target(dspi->ctlr)) { + /* + * In target mode we have to be ready to receive the maximum + * that can possibly be transferred at once by EDMA without any + * FIFO underflows. + */ + dma->bufsize = min(dma_get_max_seg_size(dma->chan_rx->device->dev), + dma_get_max_seg_size(dma->chan_tx->device->dev)) * + DMA_SLAVE_BUSWIDTH_4_BYTES; + } else { + dma->bufsize = PAGE_SIZE; + } dma->tx_dma_buf = dma_alloc_noncoherent(dma->chan_tx->device->dev, dma->bufsize, &dma->tx_dma_phys, |