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 c89544ae5ed91703c7c0b16c7a3791ef79228a6a..fde7c38103596cbf63d31d6ccec44f0a0838206d 100644 (file)
--- a/drivers/spi/spi-zynqmp-gqspi.c
+++ b/drivers/spi/spi-zynqmp-gqspi.c
@@ -698,7 +698,6 @@ 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);
@@ -713,27 +712,24 @@ 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;
 }
 
 /**