[PATCH 5/8] spi: dw-dma: Detach DMA transfer into a dedicated method

[Serge Semin <Sergey.Semin@baikalelectronics.ru>]

In order to add an alternative method of DMA-based SPI transfer first we
need to detach the currently available one from the common code. Here we
move the normal DMA-based SPI transfer execution functionality into a
dedicated method. It will be utilized if either the DMA engine supports
an unlimited number SG entries or Tx-only SPI transfer is requested. But
currently just use it for any SPI transfer.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
---
 drivers/spi/spi-dw-dma.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-dw-dma.c b/drivers/spi/spi-dw-dma.c
index 366978086781..32ef7913a73d 100644
--- a/drivers/spi/spi-dw-dma.c
+++ b/drivers/spi/spi-dw-dma.c
@@ -434,7 +434,8 @@ static int dw_spi_dma_setup(struct dw_spi *dws, struct spi_transfer *xfer)
 	return 0;
 }
 
-static int dw_spi_dma_transfer(struct dw_spi *dws, struct spi_transfer *xfer)
+static int dw_spi_dma_transfer_all(struct dw_spi *dws,
+				   struct spi_transfer *xfer)
 {
 	int ret;
 
@@ -455,7 +456,14 @@ static int dw_spi_dma_transfer(struct dw_spi *dws, struct spi_transfer *xfer)
 
 	dma_async_issue_pending(dws->txchan);
 
-	ret = dw_spi_dma_wait(dws, xfer);
+	return dw_spi_dma_wait(dws, xfer);
+}
+
+static int dw_spi_dma_transfer(struct dw_spi *dws, struct spi_transfer *xfer)
+{
+	int ret;
+
+	ret = dw_spi_dma_transfer_all(dws, xfer);
 	if (ret)
 		return ret;
 
-- 
2.27.0