linux-kernel - Re: non-Multiplatform APE6EVM broken in v3.18-rc1

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Date:	Thu, 30 Oct 2014 10:34:44 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Linux-sh list <linux-sh@...r.kernel.org>,
	Sudeep Holla <sudeep.holla@....com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: non-Multiplatform APE6EVM broken in v3.18-rc1

On Wed, Oct 29, 2014 at 06:05:03PM +0900, Simon Horman wrote:
> On Wed, Oct 29, 2014 at 09:13:11AM +0100, Geert Uytterhoeven wrote:
> > On Wed, Oct 29, 2014 at 3:08 AM, Simon Horman <horms@...ge.net.au> wrote:
> > > On Wed, Oct 29, 2014 at 09:12:58AM +0900, Simon Horman wrote:
> > >> On Tue, Oct 28, 2014 at 10:32:32AM +0100, Geert Uytterhoeven wrote:
> > >> > On Tue, Oct 28, 2014 at 10:23 AM, Simon Horman <horms@...ge.net.au> wrote:
> > >> > > On Tue, Oct 28, 2014 at 08:59:28AM +0100, Geert Uytterhoeven wrote:
> > >> > >> On Tue, Oct 28, 2014 at 1:41 AM, Simon Horman <horms@...ge.net.au> wrote:
> > >> > >> > I have noticed that there appears to be a regression between v3.17 and
> > >> > >> > v3.18-rc1 such that non-multiplatform APE6EVM (ape6evm_defconfig) no longer
> > >> > >> > boots.  This appears to be the case using both reference DT (MACH_APE6EVM)
> > 
> > > It seems that the boot stops here:
> > >
> > > ...
> > > smsc911x smsc911x eth0: MAC Address: 00:08:f7:00:02:4b
> > > rcar_thermal rcar_thermal: Runtime PM disabled, clock forced on.
> > > rcar_thermal rcar_thermal: 3 sensor probed
> > > sh_mobile_sdhi sh_mobile_sdhi.0: Runtime PM disabled, clock forced on.
> > > sh_mobile_sdhi sh_mobile_sdhi.0: No vqmmc regulator found
> > >
> > > I re-ran my bisection and this time the following showed up as the culprit.
> > >
> > > I suspect that the initialisation of mmcif, which is usually the next
> > > device to be initialised, sleeps and never wakes up because the timer is
> > > disabled.
> > >
> > > commit c387f07e6205cc13f57c1def5f885bf0a20e1c2d
> > > Author: Sudeep Holla <sudeep.holla@....com>
> > > Date:   Mon Sep 29 01:50:05 2014 +0200
> > >
> > >     clocksource: arm_arch_timer: Discard unavailable timers correctly
> > 
> > Apparently reported and fixed by Laurent and a few others, cfr.
> > http://www.spinics.net/lists/arm-kernel/msg371615.html

I have temporarily cherry-picked the following, which is no present in
linux-next, into the devel branch of the renesas tree. It appears to
resolve the problem I reported.

b0ad5917960ca80f96bae ("ARM/ARM64: arch-timer: fix arch_timer_probed logic")

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