omap3evm: touchscreen delays on pm branch

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Hi,

I am finding the response of touchscreen on the omap3evm very slow.

Here is my test:
On console, I run : watch -n2 "cat /proc/interrupts"
Then, I tap the touchscreen approximately once per second. However,
(usually) no interrupts are registered. As I increase the frequency
of 'taps' more and more interrupts are registered. But still not
matching exact taps.

However, when I keep the cpu busy with "cat /dev/zero > /dev/null &"
each tap is recognized.

EVM uses GPIO175 for touchscreen. I notice that Zoom2 uses GPIO102.
Both are not on BANK0.

Is the behavior same on ZOOM2 as well?

Best regards,
Sanjeev
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