spi: lpspi: disable lpspi module irq in DMA mode

[ Upstream commit 9728fb3ce11729aa8c276825ddf504edeb00611d ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/spi/spi-fsl-lpspi.c b/drivers/spi/spi-fsl-lpspi.c
index e8c1c8a4c6c82f509cffce8fc924b627a8c33458..9e324d72596af533ca8ad2c934247ddd3d4d637c 100644 (file)
--- a/drivers/spi/spi-fsl-lpspi.c
+++ b/drivers/spi/spi-fsl-lpspi.c
@@ -905,9 +905,14 @@ 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) {