[PATCH 17/23] spi: fsl-espi: improve the ISR frame

[Heiner Kallweit <hkallweit1@xxxxxxxxx>]

Improve the ISR frame:
- move resetting the event bits to the ISR frame
- change type of parameter irq to int
- make sure that the event bits match at least one bit in the
  interrupt mask register

Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
---
 drivers/spi/spi-fsl-espi.c | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index ee4e778..8d5bebc 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -451,17 +451,11 @@ static void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
 				&reg_base->event)) & SPIE_NF), 1000, 0);
 		if (!ret) {
 			dev_err(mspi->dev, "tired waiting for SPIE_NF\n");
-
-			/* Clear the SPIE bits */
-			mpc8xxx_spi_write_reg(&reg_base->event, events);
 			complete(&mspi->done);
 			return;
 		}
 	}
 
-	/* Clear the events */
-	mpc8xxx_spi_write_reg(&reg_base->event, events);
-
 	mspi->count -= 1;
 	if (mspi->count) {
 		u32 word = mspi->get_tx(mspi);
@@ -472,23 +466,26 @@ static void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
 	}
 }
 
-static irqreturn_t fsl_espi_irq(s32 irq, void *context_data)
+static irqreturn_t fsl_espi_irq(int irq, void *context_data)
 {
 	struct mpc8xxx_spi *mspi = context_data;
 	struct fsl_espi_reg *reg_base = mspi->reg_base;
-	irqreturn_t ret = IRQ_NONE;
-	u32 events;
+	u32 mask, events;
 
-	/* Get interrupt events(tx/rx) */
+	/* Get interrupt mask and events and check that irq belongs to us */
+	mask = mpc8xxx_spi_read_reg(&reg_base->mask);
 	events = mpc8xxx_spi_read_reg(&reg_base->event);
-	if (events)
-		ret = IRQ_HANDLED;
+	if (!(mask & events))
+		return IRQ_NONE;
 
 	dev_vdbg(mspi->dev, "%s: events %x\n", __func__, events);
 
 	fsl_espi_cpu_irq(mspi, events);
 
-	return ret;
+	/* Clear the events */
+	mpc8xxx_spi_write_reg(&reg_base->event, events);
+
+	return IRQ_HANDLED;
 }
 
 #ifdef CONFIG_PM
-- 
2.9.2


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