drm/i2c: tda998x: report whether we actually handled the IRQ

Rather than always reporting that the interrupt was handled, we should
report whether we did handle the interrupt.  Arrange to report IRQ_NONE
for cases where we found nothing to do.

This allows us to (eventually) recover from stuck-IRQ problems, rather
than causing the kernel to solidly lock up.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index d8e97085f8668673a4a90a2e2902d42357e1b372..ad3ce3479edf4ff1896f536c28b171d290c24074 100644 (file)
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -569,6 +569,7 @@ static irqreturn_t tda998x_irq_thread(int irq, void *data)
 {
        struct tda998x_priv *priv = data;
        u8 sta, cec, lvl, flag0, flag1, flag2;
+       bool handled = false;
 
        sta = cec_read(priv, REG_CEC_INTSTATUS);
        cec = cec_read(priv, REG_CEC_RXSHPDINT);
@@ -582,10 +583,12 @@ static irqreturn_t tda998x_irq_thread(int irq, void *data)
        if ((flag2 & INT_FLAGS_2_EDID_BLK_RD) && priv->wq_edid_wait) {
                priv->wq_edid_wait = 0;
                wake_up(&priv->wq_edid);
+               handled = true;
        } else if (cec != 0) {                  /* HPD change */
                schedule_delayed_work(&priv->dwork, HZ/10);
+               handled = true;
        }
-       return IRQ_HANDLED;
+       return IRQ_RETVAL(handled);
 }
 
 static uint8_t tda998x_cksum(uint8_t *buf, size_t bytes)