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

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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>
This commit is contained in:
Anton Bondarenko 2015-12-08 07:43:46 +01:00 committed by Mark Brown
parent 3760047a7d
commit bf9af08cd5
1 changed files with 3 additions and 0 deletions
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3
drivers/spi/spi-imx.c
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@ -1222,6 +1222,9 @@ static int spi_imx_probe(struct platform_device *pdev)
*/ */
if (is_imx51_ecspi(spi_imx)) { if (is_imx51_ecspi(spi_imx)) {
ret = spi_imx_sdma_init(&pdev->dev, spi_imx, master, res); ret = spi_imx_sdma_init(&pdev->dev, spi_imx, master, res);
if (ret == -EPROBE_DEFER)
goto out_clk_put;
if (ret < 0) if (ret < 0)
dev_err(&pdev->dev, "dma setup error %d, use pio\n", dev_err(&pdev->dev, "dma setup error %d, use pio\n",
ret); ret);