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 34488de55587139df47a3631079273f64df219bf..457fe6bc7e41e958c1cbf342450a4fa49919a938 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) {