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authorMark Brown <broonie@opensource.wolfsonmicro.com>2011-02-01 11:46:13 +0000
committerSamuel Ortiz <sameo@linux.intel.com>2011-03-23 10:41:46 +0100
commit8546bd4af1251d17d16b0ef682d84fd23c8beaca (patch)
treef032524ccacd1b9df03f499e4e94ac5a4dd9ce78
parent87d1906df4ecf6df0832e78e5189a39c7ea09a29 (diff)
downloadblackbird-op-linux-8546bd4af1251d17d16b0ef682d84fd23c8beaca.tar.gz
blackbird-op-linux-8546bd4af1251d17d16b0ef682d84fd23c8beaca.zip
mfd: Add fast path for WM831x touchscreen interrupts
The WM831x interrupt controller provides reporting of the touchscreen related interrupts in the primary interrupt status register as a performance optimisation - use this to avoid reading the secondary status registers for those interrupts. For code simplicity and to avoid iterating over all interrupts we open code for the two affected interrupt sources. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
-rw-r--r--drivers/mfd/wm831x-irq.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/mfd/wm831x-irq.c b/drivers/mfd/wm831x-irq.c
index 90ad3fa91329..03eb61dd0965 100644
--- a/drivers/mfd/wm831x-irq.c
+++ b/drivers/mfd/wm831x-irq.c
@@ -449,6 +449,18 @@ static irqreturn_t wm831x_irq_thread(int irq, void *data)
goto out;
}
+ /* The touch interrupts are visible in the primary register as
+ * an optimisation; open code this to avoid complicating the
+ * main handling loop and so we can also skip iterating the
+ * descriptors.
+ */
+ if (primary & WM831X_TCHPD_INT)
+ handle_nested_irq(wm831x->irq_base + WM831X_IRQ_TCHPD);
+ if (primary & WM831X_TCHDATA_INT)
+ handle_nested_irq(wm831x->irq_base + WM831X_IRQ_TCHDATA);
+ if (primary & (WM831X_TCHDATA_EINT | WM831X_TCHPD_EINT))
+ goto out;
+
for (i = 0; i < ARRAY_SIZE(wm831x_irqs); i++) {
int offset = wm831x_irqs[i].reg - 1;
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