[alsa-devel] [PATCH] ASoC: Optimise WM8996 no interrupt path

[Mark Brown]

This occurs frequently if we are in edge triggered mode as we must poll the
interrupt status register until we get no more interrupts so it's worth
the effort - it means we skip writing null acknowledgements to the chip.

Signed-off-by: Mark Brown <broonie at opensource.wolfsonmicro.com>
---
 sound/soc/codecs/wm8996.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/sound/soc/codecs/wm8996.c b/sound/soc/codecs/wm8996.c
index d3277d1..73a1588 100644
--- a/sound/soc/codecs/wm8996.c
+++ b/sound/soc/codecs/wm8996.c
@@ -2416,6 +2416,9 @@ static irqreturn_t wm8996_irq(int irq, void *data)
 	}
 	irq_val &= ~snd_soc_read(codec, WM8996_INTERRUPT_STATUS_2_MASK);
 
+	if (!irq_val)
+		return IRQ_NONE;
+
 	snd_soc_write(codec, WM8996_INTERRUPT_STATUS_2, irq_val);
 
 	if (irq_val & (WM8996_DCS_DONE_01_EINT | WM8996_DCS_DONE_23_EINT)) {
@@ -2434,10 +2437,7 @@ static irqreturn_t wm8996_irq(int irq, void *data)
 	if (irq_val & WM8996_MICD_EINT)
 		wm8996_micd(codec);
 
-	if (irq_val)
-		return IRQ_HANDLED;
-	else
-		return IRQ_NONE;
+	return IRQ_HANDLED;
 }
 
 static irqreturn_t wm8996_edge_irq(int irq, void *data)
-- 
1.7.5.4