spi: imx: defer spi initialization, if DMA engine is

If SPI device supports DMA mode, but DMA controller is not yet
available due to e.g. a delay in the corresponding kernel module
initialization, retry to initialize SPI driver later on instead of
falling back into PIO only mode.

Signed-off-by: Anton Bondarenko <anton.bondarenko.sama@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index c12306099d246660114404863dd8f6e61b2d527c..d98c33cb64f9b4825998eb1faa2316b1e4796a7d 100644 (file)
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -1222,6 +1222,9 @@ static int spi_imx_probe(struct platform_device *pdev)
         */
        if (is_imx51_ecspi(spi_imx)) {
                ret = spi_imx_sdma_init(&pdev->dev, spi_imx, master, res);
+               if (ret == -EPROBE_DEFER)
+                       goto out_clk_put;
+
                if (ret < 0)
                        dev_err(&pdev->dev, "dma setup error %d, use pio\n",
                                ret);