Unverified Commit b86fed12 authored by Serge Semin's avatar Serge Semin Committed by Mark Brown
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spi: dw-dma: Detach DMA transfer into a dedicated method 



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: default avatarSerge Semin <Sergey.Semin@baikalelectronics.ru>
Link: https://lore.kernel.org/r/20200920112322.24585-9-Sergey.Semin@baikalelectronics.ru


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 7a4d61f1

drivers/spi/spi-dw-dma.c

+10 −2
Original line number Diff line number Diff line
@@ -441,7 +441,8 @@ 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;
@@ -462,7 +463,14 @@ 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;