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

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Message-ID: <52580438.4040002@ti.com>
Date:	Fri, 11 Oct 2013 16:59:20 +0300
From:	Roger Quadros <rogerq@...com>
To:	Tony Lindgren <tony@...mide.com>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<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>,
	Benoît Cousson <bcousson@...libre.com>,
	<linux-omap@...r.kernel.org>
Subject: Re: [PATCH 4/6] pinctrl: single: Add support for wake-up interrupts

On 10/11/2013 11:49 AM, Roger Quadros wrote:
> On 10/10/2013 07:00 PM, Tony Lindgren wrote:
>> * 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.
> 
> Yes it is on OMAP3. I haven't tried with pcs_soc->rearm(). I will give it a try and
> let you know.
>>
>> Now on omap4, I've noticed the wake up interrupts are on all the time based on tests
>> with the serial driver.
>>  
>>> I think pcs_irq_set_wake() is where need to control system wakeup behaviour for the irq.
>>> This is where we should be able to change WAKEUP_EN bit of the pad
>>> to enable/disable system wakeup for that pad and also call _reconfigure_io_chain().
>>
>> Well the irq_set_wake() should only be needed for suspend and resume. For runtime PM
>> the wake-events should be always enabled by default as pointed out by Alan Stern
>> a while back.
> 
> Right, but we need to update the WAKEUP_EN bit in the pad control register for that
> to work, no?. This is something we are not doing in the driver.

OK sorry, just figured out that we are doing it indeed in pcs_irq_set().
Wasn't able to test it yet with USB. But I don't see any issues except that
pcs_soc->rearm() needs to be called from pcs_irq_set() instead of from pcs_irq_unmask().

After that you can add my

Reviewed-by: Roger Quadros <rogerq@...com>

cheers,
-roger

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