releases/5.10.186/spi-lpspi-disable-lpspi-module-irq-in-dma-mode.patch

From 3220d471aa008f91ebfcee25fd90f928161295a3 Mon Sep 17 00:00:00 2001
From: Sasha Levin <sashal@kernel.org>
Date: Fri, 5 May 2023 14:35:57 +0800
Subject: spi: lpspi: disable lpspi module irq in DMA mode

From: Clark Wang <xiaoning.wang@nxp.com>

[ 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>
---
 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