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

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Message-ID: <53DB877A.5000004@ti.com>
Date:	Fri, 1 Aug 2014 15:26:34 +0300
From:	Tero Kristo <t-kristo@...com>
To:	<balbi@...com>
CC:	Tony Lindgren <tony@...mide.com>, 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 04:49 PM, Felipe Balbi wrote:
> Hi,
>
> On Thu, Jul 31, 2014 at 10:57:09AM +0300, Tero Kristo wrote:
>> 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.
>
> did you apply the quick little hack to prm3xxx.c ? prcm IRQ is hardcoded
> to 11, once we switch to a linear irq domain, irq_base may change.

Yea, with that hack it works. However, you should make that into a 
proper patch and add it to this series, otherwise you will be causing 
regressions. Just renaming that tmp into something meaningful for now 
should be enough for me at least.

-Tero

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