Re: [PATCH 4/6] pinctrl: single: Add support for wake-up interrupts

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 10/10/2013 07:23 PM, Tony Lindgren wrote:
> * Tony Lindgren <tony@xxxxxxxxxxx> [131010 09:09]:
>> * Roger Quadros <rogerq@xxxxxx> [131010 06:32]:
>>>
>>> I tried testing this with the USB EHCI driver, but I'm not getting wake up interrupts
>>> while the system is still running and only the EHCI controller is runtime suspended.
>>>
>>> It seems we need to somehow call _reconfigure_io_chain() to update the daisy chain
>>> whenever the pad wakeup_enable bit is changed.
>>
>> Sounds like this is on omap3? Have you tried calling pcs_soc->rearm() in the
>> pcs_irq_handle() like the comments there suggest? At least for me that keeps
>> the wake-up interrupts continuously running on omap3 instead of just idle modes.
>>
>> Now on omap4, I've noticed the wake up interrupts are on all the time based on tests
>> with the serial driver.
> 
> Oh, and if you're runtime suspending EHCI only, and if the EHCI module has
> wake-up registers, it should be able to wake EHCI from retention on it's own
> without a need for the io chain at all.
> 

The problem is that the asynchronous wake up mechanism for USB Host module is broken
in the design so we have to rely on IO daisy chain every time. :(

cheers,
-roger
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Linux Arm (vger)]     [ARM Kernel]     [ARM MSM]     [Linux Tegra]     [Linux WPAN Networking]     [Linux Wireless Networking]     [Maemo Users]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite Trails]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux