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

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Date:	Thu, 31 Jul 2014 08:49:45 -0500
From:	Felipe Balbi <balbi@...com>
To:	Tero Kristo <t-kristo@...com>
CC:	Tony Lindgren <tony@...mide.com>, Felipe Balbi <balbi@...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

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.

-- 
balbi

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