Messages in this thread Patch in this message | | | From | Anton Bondarenko <> | Subject | [PATCH v2 7/8] spi: imx: defer spi initialization, if DMA engine is pending | Date | Fri, 25 Sep 2015 19:57:14 +0200 |
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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: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> Signed-off-by: Anton Bondarenko <anton_bondarenko@mentor.com> --- drivers/spi/spi-imx.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index 44d3cf0..1bf0739a 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -1343,9 +1343,15 @@ static int spi_imx_probe(struct platform_device *pdev) * Only validated on i.mx6 now, can remove the constrain if validated on * other chips. */ - if (is_imx5x_ecspi(spi_imx) && - spi_imx_sdma_init(&pdev->dev, spi_imx, master)) - dev_err(&pdev->dev, "dma setup error,use pio instead\n"); + if (is_imx5x_ecspi(spi_imx)) { + ret = spi_imx_sdma_init(&pdev->dev, spi_imx, master); + if (ret == -EPROBE_DEFER) + goto out_clk_put; + + if (ret < 0) + dev_err(&pdev->dev, "dma setup error %d, use pio\n", + ret); + } spi_imx->devtype_data->reset(spi_imx); -- 2.5.2
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