Unverified Commit b86fed12 authored Sep 20, 2020 by Serge Semin Committed by Mark Brown Sep 29, 2020

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

Signed-off-by: Mark 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;