From b86fed121fe6bf5bcac1c258472791ca352f47cf Mon Sep 17 00:00:00 2001 From: Serge Semin Date: Sun, 20 Sep 2020 14:23:19 +0300 Subject: [PATCH] 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 Link: https://lore.kernel.org/r/20200920112322.24585-9-Sergey.Semin@baikalelectronics.ru Signed-off-by: Mark Brown --- 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 9f70818acce6..f2baefcae9ae 100644 --- a/drivers/spi/spi-dw-dma.c +++ b/drivers/spi/spi-dw-dma.c @@ -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;