During FIFO/DMA modes dynamic switching, only corresponding interrupts are
enabled. However its possible that FIFO related interrupt status registers
get set during DMA mode. For example WR_FIFO_EMPTY bit is set during DMA
TX.

Ignore such status bits so that they don't trip unwanted operations.

Suggested-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Vijaya Krishna Nivarthi <quic_vnivarth@quicinc.com>
---
 drivers/spi/spi-qcom-qspi.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/spi/spi-qcom-qspi.c b/drivers/spi/spi-qcom-qspi.c
index a0ad980..b995542 100644
--- a/drivers/spi/spi-qcom-qspi.c
+++ b/drivers/spi/spi-qcom-qspi.c
@@ -603,6 +603,9 @@ static irqreturn_t qcom_qspi_irq(int irq, void *dev_id)
 	int_status = readl(ctrl->base + MSTR_INT_STATUS);
 	writel(int_status, ctrl->base + MSTR_INT_STATUS);
 
+	/* Ignore disabled interrupts */
+	int_status &= readl(ctrl->base + MSTR_INT_EN);
+
 	/* PIO mode handling */
 	if (ctrl->xfer.dir == QSPI_WRITE) {
 		if (int_status & WR_FIFO_EMPTY)
-- 
Qualcomm INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, hosted by the Linux Foundation.

Hi,

On Tue, Jul 25, 2023 at 4:48 AM Vijaya Krishna Nivarthi
<quic_vnivarth@quicinc.com> wrote:
>
> During FIFO/DMA modes dynamic switching, only corresponding interrupts are
> enabled. However its possible that FIFO related interrupt status registers
> get set during DMA mode. For example WR_FIFO_EMPTY bit is set during DMA
> TX.
>
> Ignore such status bits so that they don't trip unwanted operations.
>
> Suggested-by: Douglas Anderson <dianders@chromium.org>
> Signed-off-by: Vijaya Krishna Nivarthi <quic_vnivarth@quicinc.com>
> ---
>  drivers/spi/spi-qcom-qspi.c | 3 +++
>  1 file changed, 3 insertions(+)

Things are pretty broken without this fix, so it definitely needs a
Fixes tag so it can find its way to mainline as soon as possible:

Fixes: b5762d95607e ("spi: spi-qcom-qspi: Add DMA mode support")

Looks good to me and also works fixes the problem for me. Thus I'm
happy with any of these tags:

Reviewed-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Douglas Anderson <dianders@chromium.org>