input: ti_am335x_tsc: return IRQ_NONE if there was no IRQ for us

The previous patch ("input/ti_am335x_tsc: ACK the HW_PEN irq in ISR")
acked the interrupt so we don't freeze if we don't handle an enabled
interrupt source. The interrupt core has a mechanism for this and to get
it work one should only say that it handled an interrupt if it is
actually the case.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

1 files changed, 6 insertions, 4 deletions

diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
index 2ba77039ab91..0e9f02aeae6b 100644
--- a/drivers/input/touchscreen/ti_am335x_tsc.c
+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
@@ -314,10 +314,12 @@ static irqreturn_t titsc_irq(int irq, void *dev)
                 titsc_writel(ts_dev, REG_IRQCLR, IRQENB_HW_PEN);
         }
 
-        titsc_writel(ts_dev, REG_IRQSTATUS, irqclr);
-
-        am335x_tsc_se_update(ts_dev->mfd_tscadc);
-        return IRQ_HANDLED;
+        if (irqclr) {
+                titsc_writel(ts_dev, REG_IRQSTATUS, irqclr);
+                am335x_tsc_se_update(ts_dev->mfd_tscadc);
+                return IRQ_HANDLED;
+        }
+        return IRQ_NONE;
 }
 
 static int titsc_parse_dt(struct platform_device *pdev,