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Groups > linux.kernel > #1284591

[PATCH v5 07/11] 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>
---
 drivers/spi/spi-imx.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index 277dd75..fa24637 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -1221,6 +1221,9 @@ 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);
-- 
2.6.3

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Thread

[PATCH v5 00/11] Improvements for SPI IMX driver for Freescale IMX51, IMX53 and IMX6 Anton Bondarenko <anton.bondarenko.sama@gmail.com> - 2015-12-05 18:00 +0100
  [PATCH v5 06/11] spi: imx: return error from dma channel request Anton Bondarenko <anton.bondarenko.sama@gmail.com> - 2015-12-05 18:00 +0100
    Re: [PATCH v5 06/11] spi: imx: return error from dma channel request Sascha Hauer <s.hauer@pengutronix.de> - 2015-12-07 10:40 +0100
      Re: [PATCH v5 06/11] spi: imx: return error from dma channel request Anton Bondarenko <anton.bondarenko.sama@gmail.com> - 2015-12-08 00:40 +0100
  [PATCH v5 01/11] spi: imx: terminate RX DMA transaction in case of TX DMA timeout Anton Bondarenko <anton.bondarenko.sama@gmail.com> - 2015-12-05 18:00 +0100
  [PATCH v5 08/11] spi: imx: allow only WML aligned transfers to use DMA Anton Bondarenko <anton.bondarenko.sama@gmail.com> - 2015-12-05 18:00 +0100
    Re: [PATCH v5 08/11] spi: imx: allow only WML aligned transfers to  use DMA Sascha Hauer <s.hauer@pengutronix.de> - 2015-12-07 10:50 +0100
      Re: [PATCH v5 08/11] spi: imx: allow only WML aligned transfers to  use DMA Anton Bondarenko <anton.bondarenko.sama@gmail.com> - 2015-12-08 01:40 +0100
        Re: [PATCH v5 08/11] spi: imx: allow only WML aligned transfers to  use DMA Sascha Hauer <s.hauer@pengutronix.de> - 2015-12-08 07:10 +0100
  [PATCH v5 07/11] spi: imx: defer spi initialization, if DMA engine is Anton Bondarenko <anton.bondarenko.sama@gmail.com> - 2015-12-05 18:00 +0100
  [PATCH v5 02/11] spi: imx: reorder HW operations enable order to avoid possible RX data loss Anton Bondarenko <anton.bondarenko.sama@gmail.com> - 2015-12-05 18:00 +0100
  [PATCH v5 10/11] spi: imx: replace fixed timeout with calculated Anton Bondarenko <anton.bondarenko.sama@gmail.com> - 2015-12-05 18:00 +0100

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