In case of DMA we never got things done until we enable both channels. In case of receive only or send only mode the user has to provide a dummy buffer.
Signed-off-by: Andy Shevchenko <[email protected]> --- drivers/spi/spi-dw-mid.c | 6 ++---- drivers/spi/spi-dw.h | 4 ++++ 2 files changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/spi/spi-dw-mid.c b/drivers/spi/spi-dw-mid.c index f7f0ad2..97156e4 100644 --- a/drivers/spi/spi-dw-mid.c +++ b/drivers/spi/spi-dw-mid.c @@ -119,10 +119,8 @@ static int mid_spi_dma_transfer(struct dw_spi *dws, int cs_change) spi_enable_chip(dws, 0); dw_writew(dws, DW_SPI_DMARDLR, 0xf); dw_writew(dws, DW_SPI_DMATDLR, 0x10); - if (dws->tx_dma) - dma_ctrl |= 0x2; - if (dws->rx_dma) - dma_ctrl |= 0x1; + dma_ctrl |= SPI_DMA_TDMAE; + dma_ctrl |= SPI_DMA_RDMAE; dw_writew(dws, DW_SPI_DMACR, dma_ctrl); spi_enable_chip(dws, 1); } diff --git a/drivers/spi/spi-dw.h b/drivers/spi/spi-dw.h index 089fc4b..83a103a 100644 --- a/drivers/spi/spi-dw.h +++ b/drivers/spi/spi-dw.h @@ -74,6 +74,10 @@ #define SPI_INT_RXFI (1 << 4) #define SPI_INT_MSTI (1 << 5) +/* Bit fields in DMACR */ +#define SPI_DMA_RDMAE (1 << 0) +#define SPI_DMA_TDMAE (1 << 1) + /* TX RX interrupt level threshold, max can be 256 */ #define SPI_INT_THRESHOLD 32 -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-spi" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
