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Date: Thu, 10 Oct 2013 09:23:15 -0700
From: Tony Lindgren <tony@...mide.com>
To: Roger Quadros <rogerq@...com>
Cc: devicetree@...r.kernel.org,
Grygorii Strashko <grygorii.strashko@...com>,
Linus Walleij <linus.walleij@...aro.org>,
linux-kernel@...r.kernel.org,
Peter Ujfalusi <peter.ujfalusi@...com>,
Prakash Manjunathappa <prakash.pm@...com>,
Haojian Zhuang <haojian.zhuang@...aro.org>,
BenoƮt Cousson <bcousson@...libre.com>,
linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 4/6] pinctrl: single: Add support for wake-up interrupts
* Tony Lindgren <tony@...mide.com> [131010 09:09]:
> * Roger Quadros <rogerq@...com> [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.
At least the serial driver does that if it's internal wake-up registers are
configured right. But for off-idle, the serial driver needs the io chain wake-up
events.
Regards,
Tony
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