linux-kernel - Re: [PATCH 01/11] ARM: vexpress: use ARM_CPU

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Date:	Sat, 14 Feb 2015 06:55:05 +0800 (HKT)
From:	Nicolas Pitre <nicolas.pitre@...aro.org>
To:	Liviu Dudau <Liviu.Dudau@....com>
cc:	Arnd Bergmann <arnd@...db.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"arm@...nel.org" <arm@...nel.org>,
	Kevin Hilman <khilman@...aro.org>,
	Sudeep Holla <Sudeep.Holla@....com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>
Subject: Re: [PATCH 01/11] ARM: vexpress: use ARM_CPU_SUSPEND if needed

On Fri, 13 Feb 2015, Liviu Dudau wrote:

> On Thu, Feb 12, 2015 at 07:42:33PM +0000, Arnd Bergmann wrote:
> > The vexpress tc2 power management code calls mcpm_loopback, which
> > is only available if ARM_CPU_SUSPEND is enabled, otherwise we
> > get a link error:
> > 
> > arch/arm/mach-vexpress/built-in.o: In function `tc2_pm_init':
> > arch/arm/mach-vexpress/tc2_pm.c:389: undefined reference to `mcpm_loopback'
> 
> Arnd,
> 
> We are having reports of TC2 not booting with MCPM enabled. Lorenzo
> was investigating this but then headed for Linaro Connect this week,
> so we don't have yet a resolution. Can this patch be postponed for
> a later -rc?

Can you share those reports?  I did boot my TC2 with v3.19-rc7 before 
leaving for Linaro Connect and it just worked.

Regardless, this patch is about a build fix and doesn't change any 
functionality, so I wouldn't postpone it.



> 
> Best regards,
> Liviu
> 
> 
> > 
> > This explicitly selects ARM_CPU_SUSPEND like other platforms that
> > need it.
> > 
> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> > Fixes: 3592d7e002438 ("ARM: 8082/1: TC2: test the MCPM loopback during boot")
> > Cc: Nicolas Pitre <nico@...aro.org>
> > Cc: Kevin Hilman <khilman@...aro.org>
> > Cc: Liviu Dudau <liviu.dudau@....com>
> > Cc: Sudeep Holla <sudeep.holla@....com>
> > Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> > ---
> >  arch/arm/mach-vexpress/Kconfig | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/arch/arm/mach-vexpress/Kconfig b/arch/arm/mach-vexpress/Kconfig
> > index d6b16d9a7838..3c2509b4b694 100644
> > --- a/arch/arm/mach-vexpress/Kconfig
> > +++ b/arch/arm/mach-vexpress/Kconfig
> > @@ -73,6 +73,7 @@ config ARCH_VEXPRESS_TC2_PM
> >  	depends on MCPM
> >  	select ARM_CCI
> >  	select ARCH_VEXPRESS_SPC
> > +	select ARM_CPU_SUSPEND
> >  	help
> >  	  Support for CPU and cluster power management on Versatile Express
> >  	  with a TC2 (A15x2 A7x3) big.LITTLE core tile.
> > -- 
> > 2.1.0.rc2
> > 
> > 
> 
> -- 
> ====================
> | I would like to |
> | fix the world,  |
> | but they're not |
> | giving me the   |
>  \ source code!  /
>   ---------------
>     ¯\_(ツ)_/¯
> 
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