static int spi_imx_transfer(struct spi_device *spi, struct spi_transfer *transfer) { struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); if (spi_imx->usedma) return spi_imx_dma_transfer(spi_imx, transfer); else return spi_imx_pio_transfer(spi, transfer); }
static int spi_imx_transfer(struct spi_device *spi, struct spi_transfer *transfer) { int ret; struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); if (spi_imx->bitbang.master->can_dma && spi_imx_can_dma(spi_imx->bitbang.master, spi, transfer)) { spi_imx->usedma = true; ret = spi_imx_dma_transfer(spi_imx, transfer); if (ret != -EAGAIN) return ret; } spi_imx->usedma = false; return spi_imx_pio_transfer(spi, transfer); }