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spi: dw-dma: Detach DMA transfer into a dedicated method

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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>
This commit is contained in:
Serge Semin 2020-09-20 14:23:19 +03:00 committed by Mark Brown
parent 7a4d61f1dc
commit b86fed121f
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GPG Key ID: 24D68B725D5487D0
1 changed files with 10 additions and 2 deletions
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12
drivers/spi/spi-dw-dma.c
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@ -441,7 +441,8 @@ static int dw_spi_dma_setup(struct dw_spi *dws, struct spi_transfer *xfer)
return 0; 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; 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); 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) if (ret)
return ret; return ret;