This is a note to let you know that I've just added the patch titled
spi: lpspi: disable lpspi module irq in DMA mode
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
spi-lpspi-disable-lpspi-module-irq-in-dma-mode.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 0458e8f0dcd6ac34a50ea0164176dee586759b10
Author: Clark Wang <xiaoning.wang@xxxxxxx>
Date: Fri May 5 14:35:57 2023 +0800
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@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>
diff --git a/drivers/spi/spi-fsl-lpspi.c b/drivers/spi/spi-fsl-lpspi.c
index e8c1c8a4c6c82..9e324d72596af 100644
--- 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) {
