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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>
This commit is contained in:
Russell King 2015-06-06 21:41:09 +01:00
parent 3f3d0d0073
commit f84a97d480
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/i2c/tda998x_drv.c
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@ -569,6 +569,7 @@ static irqreturn_t tda998x_irq_thread(int irq, void *data)
{ {
struct tda998x_priv *priv = data; struct tda998x_priv *priv = data;
u8 sta, cec, lvl, flag0, flag1, flag2; u8 sta, cec, lvl, flag0, flag1, flag2;
bool handled = false;
sta = cec_read(priv, REG_CEC_INTSTATUS); sta = cec_read(priv, REG_CEC_INTSTATUS);
cec = cec_read(priv, REG_CEC_RXSHPDINT); 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) { if ((flag2 & INT_FLAGS_2_EDID_BLK_RD) && priv->wq_edid_wait) {
priv->wq_edid_wait = 0; priv->wq_edid_wait = 0;
wake_up(&priv->wq_edid); wake_up(&priv->wq_edid);
handled = true;
} else if (cec != 0) { /* HPD change */ } else if (cec != 0) { /* HPD change */
schedule_delayed_work(&priv->dwork, HZ/10); 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) static uint8_t tda998x_cksum(uint8_t *buf, size_t bytes)