spi: imx: use pio mode for i.mx6dl

For TKT238285 hardware issue which may cause txfifo store data twice can only
be caught on i.mx6dl, we use pio mode instead of DMA mode on i.mx6dl.

Fixes: f62caccd12c17e4 (spi: spi-imx: add DMA support)
Signed-off-by: Robin Gong <b38343@freescale.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org

diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index 961b97d43b430914ed317b9623d06f940e39d797..fe1b7699fab634a31ae9e903146b775c467ddd80 100644 (file)
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -823,6 +823,10 @@ static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx,
        struct dma_slave_config slave_config = {};
        int ret;
 
+       /* use pio mode for i.mx6dl chip TKT238285 */
+       if (of_machine_is_compatible("fsl,imx6dl"))
+               return 0;
+
        /* Prepare for TX DMA: */
        master->dma_tx = dma_request_slave_channel(dev, "tx");
        if (!master->dma_tx) {