spi: dw-mid: follow new DMAengine workflow

Though intel-mid-dma does not follow a new DMA workflow (*) let's prepare SPI
DW driver for that.

(*) The client is obliged to call dma_async_issue_pending() which starts the
actual transfers. Old DMA drivers do not follow this, since requirement was
introduced in the discussion of [1].

[1] http://www.spinics.net/lists/arm-kernel/msg125987.html

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-dw-mid.c b/drivers/spi/spi-dw-mid.c
index a507add..46c6d58 100644 (file)
--- a/drivers/spi/spi-dw-mid.c
+++ b/drivers/spi/spi-dw-mid.c
@@ -150,7 +150,7 @@ static int mid_spi_dma_transfer(struct dw_spi *dws, int cs_change)
                                &dws->tx_sgl,
                                1,
                                DMA_MEM_TO_DEV,
-                               DMA_PREP_INTERRUPT);
+                               DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
        txdesc->callback = dw_spi_dma_done;
        txdesc->callback_param = dws;
 
@@ -172,13 +172,17 @@ static int mid_spi_dma_transfer(struct dw_spi *dws, int cs_change)
                                &dws->rx_sgl,
                                1,
                                DMA_DEV_TO_MEM,
-                               DMA_PREP_INTERRUPT);
+                               DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
        rxdesc->callback = dw_spi_dma_done;
        rxdesc->callback_param = dws;
 
        /* rx must be started before tx due to spi instinct */
        dmaengine_submit(rxdesc);
+       dma_async_issue_pending(dws->rxchan);
+
        dmaengine_submit(txdesc);
+       dma_async_issue_pending(dws->txchan);
+
        return 0;
 }