spi: lpspi: disable lpspi module irq in DMA mode

When all bits of IER are set to 0, we still can observe the lpspi irq events
when using DMA mode to transfer data.

So disable irq to avoid the too much irq events.

Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
Link: https://lore.kernel.org/r/20230505063557.3962220-1-xiaoning.wang@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-fsl-lpspi.c b/drivers/spi/spi-fsl-lpspi.c
index f2341ab99556649fa308931afc7ede4e8bc7cd52..4b70038ceb6b28e16d1cd2936547074834764f13 100644 (file)
--- a/drivers/spi/spi-fsl-lpspi.c
+++ b/drivers/spi/spi-fsl-lpspi.c
@@ -910,9 +910,14 @@ static int fsl_lpspi_probe(struct platform_device *pdev)
        ret = fsl_lpspi_dma_init(&pdev->dev, fsl_lpspi, controller);
        if (ret == -EPROBE_DEFER)
                goto out_pm_get;
-
        if (ret < 0)
                dev_err(&pdev->dev, "dma setup error %d, use pio\n", ret);
+       else
+               /*
+                * disable LPSPI module IRQ when enable DMA mode successfully,
+                * to prevent the unexpected LPSPI module IRQ events.
+                */
+               disable_irq(irq);
 
        ret = devm_spi_register_controller(&pdev->dev, controller);
        if (ret < 0) {