[PATCH AUTOSEL 5.10 03/14] spi: lpspi: disable lpspi module irq in DMA mode

[Sasha Levin]

From: Clark Wang <xiaoning.wang@xxxxxxx>

[ 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@xxxxxxx>
Link: https://lore.kernel.org/r/20230505063557.3962220-1-xiaoning.wang@xxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/spi/spi-fsl-lpspi.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-fsl-lpspi.c b/drivers/spi/spi-fsl-lpspi.c
index 5d98611dd999d..c5ff6e8c45be0 100644
--- a/drivers/spi/spi-fsl-lpspi.c
+++ b/drivers/spi/spi-fsl-lpspi.c
@@ -906,9 +906,14 @@ 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) {
-- 
2.39.2