diff options
Diffstat (limited to 'src/soc')
| -rw-r--r-- | src/soc/nvidia/tegra132/spi.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/src/soc/nvidia/tegra132/spi.c b/src/soc/nvidia/tegra132/spi.c index f1be207ced..973bdc94ea 100644 --- a/src/soc/nvidia/tegra132/spi.c +++ b/src/soc/nvidia/tegra132/spi.c @@ -530,10 +530,24 @@ static void tegra_spi_dma_start(struct tegra_spi_channel *spi) */ setbits_le32(&spi->regs->trans_status, SPI_STATUS_RDY); - if (spi->dma_out) + /* + * The DMA triggers have units of packets. As each packet is currently + * 1 byte the triggers need to be set to 4 packets (0b01) to match + * the AHB 32-bit (4 byte) tranfser. Otherwise the FIFO errors can + * occur. + */ + if (spi->dma_out) { + clrsetbits_le32(&spi->regs->dma_ctl, + SPI_DMA_CTL_TX_TRIG_MASK << SPI_DMA_CTL_TX_TRIG_SHIFT, + 1 << SPI_DMA_CTL_TX_TRIG_SHIFT); setbits_le32(&spi->regs->command1, SPI_CMD1_TX_EN); - if (spi->dma_in) + } + if (spi->dma_in) { + clrsetbits_le32(&spi->regs->dma_ctl, + SPI_DMA_CTL_RX_TRIG_MASK << SPI_DMA_CTL_RX_TRIG_SHIFT, + 1 << SPI_DMA_CTL_RX_TRIG_SHIFT); setbits_le32(&spi->regs->command1, SPI_CMD1_RX_EN); + } /* * To avoid underrun conditions, enable APB DMA before SPI DMA for |