spi: zynqmp-gqspi: Always acknowledge interrupts

[ Upstream commit 89785306453ce6d949e783f6936821a0b7649ee2 ]

RXEMPTY can cause an IRQ, even though we may not do anything about it
(such as if we are waiting for more received data). We must still handle
these IRQs because we can tell they were caused by the device.

Signed-off-by: Sean Anderson <sean.anderson@linux.dev>
Link: https://patch.msgid.link/20250116224130.2684544-6-sean.anderson@linux.dev
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/spi/spi-zynqmp-gqspi.c b/drivers/spi/spi-zynqmp-gqspi.c
index d800d79f62a70c74551e1ad6f628685ec6c18b0d..12ab13edab543b5d0a37e194759f9fa51bfda50f 100644 (file)
--- a/drivers/spi/spi-zynqmp-gqspi.c
+++ b/drivers/spi/spi-zynqmp-gqspi.c
@@ -799,7 +799,6 @@ static void zynqmp_process_dma_irq(struct zynqmp_qspi *xqspi)
 static irqreturn_t zynqmp_qspi_irq(int irq, void *dev_id)
 {
        struct zynqmp_qspi *xqspi = (struct zynqmp_qspi *)dev_id;
-       irqreturn_t ret = IRQ_NONE;
        u32 status, mask, dma_status = 0;
 
        status = zynqmp_gqspi_read(xqspi, GQSPI_ISR_OFST);
@@ -814,27 +813,24 @@ static irqreturn_t zynqmp_qspi_irq(int irq, void *dev_id)
                                   dma_status);
        }
 
-       if (mask & GQSPI_ISR_TXNOT_FULL_MASK) {
+       if (!mask && !dma_status)
+               return IRQ_NONE;
+
+       if (mask & GQSPI_ISR_TXNOT_FULL_MASK)
                zynqmp_qspi_filltxfifo(xqspi, GQSPI_TX_FIFO_FILL);
-               ret = IRQ_HANDLED;
-       }
 
-       if (dma_status & GQSPI_QSPIDMA_DST_I_STS_DONE_MASK) {
+       if (dma_status & GQSPI_QSPIDMA_DST_I_STS_DONE_MASK)
                zynqmp_process_dma_irq(xqspi);
-               ret = IRQ_HANDLED;
-       } else if (!(mask & GQSPI_IER_RXEMPTY_MASK) &&
-                       (mask & GQSPI_IER_GENFIFOEMPTY_MASK)) {
+       else if (!(mask & GQSPI_IER_RXEMPTY_MASK) &&
+                       (mask & GQSPI_IER_GENFIFOEMPTY_MASK))
                zynqmp_qspi_readrxfifo(xqspi, GQSPI_RX_FIFO_FILL);
-               ret = IRQ_HANDLED;
-       }
 
        if (xqspi->bytes_to_receive == 0 && xqspi->bytes_to_transfer == 0 &&
            ((status & GQSPI_IRQ_MASK) == GQSPI_IRQ_MASK)) {
                zynqmp_gqspi_write(xqspi, GQSPI_IDR_OFST, GQSPI_ISR_IDR_MASK);
                complete(&xqspi->data_completion);
-               ret = IRQ_HANDLED;
        }
-       return ret;
+       return IRQ_HANDLED;
 }
 
 /**