Panda ES board hang when using GPIO as interrupt

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Hi Kevin, Tarun,

We are using the expansion connector A on Panda board to mount a SDIO WiFi dongle on MMC2 with a level triggered interrupt signal connected to GPIO 138. It's been working fine until 3.5 rc1. The board hang randomly within 5 mins during a network traffic test. After bisecting we found the culprit is "[PATCH 8/8] gpio/omap: fix missing check in *_runtime_suspend()" [1].

I noticed Kevin raised some similar cases on other platforms and also provided two patches in the patch mail thread. But unfortunately those two patches doesn't help in our case. I tested the driver with 3.5-rc3 mainline kernel and the issue is still there. I can only "fix" the hang by either reverting the commit or disabling CONFIG_PM_RUNTIME. Also, the hang only happens on Panda ES board. Old Panda with 4430 works good.

Any thoughts and suggestions?

Thanks,
Franky

[1] http://article.gmane.org/gmane.linux.ports.arm.omap/75708/

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