Hi, On a custom built am335x based board, I am facing an issue mwifiex wifi module which is connected to host via SDIO interface. I am using kernel version 4.4. The problem is related to the wifi "ext_scan" command getting timed out over SDIO. This was working with old kernel (v4.0), but does not work on kernel v4.4. I found the following commit is responsible for this behavior. ================================= 5b83b2234be6733cfe22036c38031b2c890b3db8 mmc: omap_hsmmc: Change wake-up interrupt to use generic wakeirq We can now use generic wakeirq handling and remove the custom handling for the wake-up interrupts. ================================= There is no wifi issue if I revert the above mentioned commit on kernel v4.4. I see that before this commit, the wakeup IRQ handler was registered within the omap_hsmmc.c itself with additional IRQF_TRIGGER_LOW flag. But with the introduction to dev_pm_set_dedicated_wake_irq(), the generic wakeup IRQ handler is registered which does not take the IRQF_TRIGGER flag. I am not sure if that is the issue, but I added that IRQF_TRIGGER_LOW flag in dev_pm_set_dedicated_wake_irq() while registering a threaded IRQ handler, I could see the problem disappears. However, this change is causing the infinite interrupts because the of level triggered interrupt is not handled in generic wakeup IRQ handling code (as it was done specially in omap_hsmmc.c code earlier). I am not much familiar with MMC/SDIO driver and I am not sure how to fix this behavior. So any guidance would be really helpful. Thanks, Vishal -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
