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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>
This commit is contained in:
Mark Brown 2011-02-01 11:46:13 +00:00 committed by Samuel Ortiz
parent 87d1906df4
commit 8546bd4af1
1 changed files with 12 additions and 0 deletions
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12
drivers/mfd/wm831x-irq.c
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@ -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;