linux-kernel - Re: [PATCH 29/35] arm: omap: intc: switch over to linear irq domain

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Date:	Thu, 31 Jul 2014 10:57:09 +0300
From:	Tero Kristo <t-kristo@...com>
To:	Tony Lindgren <tony@...mide.com>, Felipe Balbi <balbi@...com>
CC:	Nishanth Menon <nm@...com>, dt list <devicetree@...r.kernel.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	<jason@...edaemon.net>, Kevin Hilman <khilman@...prootsystems.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Benoit Cousson <bcousson@...libre.com>, <tglx@...utronix.de>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel Mailing List 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 29/35] arm: omap: intc: switch over to linear irq domain

On 07/31/2014 09:28 AM, Tony Lindgren wrote:
> * Felipe Balbi <balbi@...com> [140730 09:23]:
>> Hi,
>>
>> On Wed, Jul 30, 2014 at 10:45:41AM -0500, Nishanth Menon wrote:
>>> On Wed, Jul 30, 2014 at 9:40 AM, Felipe Balbi <balbi@...com> wrote:
>>>> HI,
>>>>
>>>> On Tue, Jul 29, 2014 at 11:04:21PM -0700, Tony Lindgren wrote:
>>>>> * Felipe Balbi <balbi@...com> [140729 09:36]:
>>>>>> Hi,
>>>>>>
>>>>>> On Tue, Jul 29, 2014 at 10:40:57AM -0500, Felipe Balbi wrote:
>>>>>>> On Tue, Jul 29, 2014 at 08:20:52AM -0700, Tony Lindgren wrote:
>>>>>>>> * Felipe Balbi <balbi@...com> [140729 07:18]:
>>>>>>>>> Hi,
>>>>>>>>>
>>>>>>>>> On Tue, Jul 29, 2014 at 05:14:25AM -0700, Tony Lindgren wrote:
>>>>>>>>>> * Felipe Balbi <balbi@...com> [140728 14:19]:
>>>>>>>>>>> now that we don't need to support legacy board-files,
>>>>>>>>>>> we can completely switch over to a linear irq domain
>>>>>>>>>>> and make use of irq_alloc_domain_generic_chips() to
>>>>>>>>>>> allocate all generic irq chips for us.
>>>>>>>>>>
>>>>>>>>>> This patch seems to somehow break off-idle for omap3
>>>>>>>>>> where it no longer wakes up.
>>>>>>>>>
>>>>>>>>> Sure your bisection is correct ? This patch just switches from legacy
>>>>>>>>> irq domain to linear irq domain.
>>>>>>>>
>>>>>>>> Yes, I tried it a few times. Just enabling
>>>>>>>> retention idle hangs too with this patch.
>>>>>>>>
>>>>>>>> Maybe it's omap3_prcm_irq_setup that relies on
>>>>>>>> 11 + OMAP_INTC_START? There may be other such issues
>>>>>>>
>>>>>>> lol.
>>>>>>>
>>>>>>> OMAP4 has the same nonsense.
>>>>>>
>>>>>> made me think why (if) OMAP4 works with that same setup. Does wake from
>>>>>> OFF work with OMAP4 ?
>>>>>
>>>>> Not without similar changes, omap4+ has the same issue.. There's a RFC
>>>>> series from Nishant to fix some of this, and Tero is moving the PRCM
>>>>> into a driver.
>>>>>
>>>>>> Anyway, here's a quick little hack to check if that's the reason for the
>>>>>> regression:
>>>>>
>>>>> OK yeah that's along the same lines with Nishant's RFC series in thread
>>>>> "[RFC PATCH 0/7] ARM: OMAP4+: PRM: minor cleanups and dt support of
>>>>> interrupts"
>>>>>
>>>>> FYI, it did not compile, needs to include linux/of_irq.h. But yes,
>>>>
>>>> I might have sent the wrong version as I had that same build error and
>>>> fixed it localy.
>>>>
>>>>> it fixes the regression for me, Also now the whole series works for
>>>>> me :)
>>>>
>>>> good to know.
>>>>
>>>> What do you want to do now ? Wait for PRCM to become a driver ? Wait for
>>>> Nishanth's series to get accepted ? I guess the same thing could be done
>>>> for OMAP3 and AM33, then we would have a chance of having working wake
>>>> from idle with the new irqchip.
>>>
>>> I can repost the current series as it stands now once 17-rc1 comes out
>>> (without the build failure ofcourse).. if that helps to move it out of
>>> RFC status.
>>
>> That'd be great. It would be ever greater if you could add support for
>> OMAP3 on that too.
>
> Yeah sounds good to me. Tero, does that work OK for your PRCM changes?

Well, this set seems to break PM. suspend-resume on omap3-beagle just 
hangs after this set is applied. Works fine without it with 3.16-rc5 tag.

-Tero
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