Re: [PATCH 01/11] ARM: vexpress: use ARM_CPU_SUSPEND if needed

Liviu Dudau
2015-02-13T11:01:56Z

On Fri, Feb 13, 2015 at 10:57:53AM +0000, Russell King - ARM Linux wrote:
> On Fri, Feb 13, 2015 at 10:37:16AM +0000, 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?
>
> Why?
>
> This patch isn't forcing MCPM to be enabled for Versatile Express.
>
> * In order to build tc2_pm.c, MCPM must already be enabled (the
> feature depends on MCPM in the Kconfig already)
> * When this feature is enabled, the above link error occurs if
> ARM_CPU_SUSPEND is not also enabled.
>
> So, it is merely fixing the requirement that tc2_pm.c needs the CPU
> suspend infrastructure, which in turn has no effect on whether MCPM
> is enabled or not.

Because I think Lorenzo's plan was to disable MCPM for TC2. Which would
make this patch moot.

Best regards,
Liviu

>
> --
> FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
> according to speedtest.net.
>

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