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

[Liviu Dudau]

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?

Best regards,
Liviu


> 
> This explicitly selects ARM_CPU_SUSPEND like other platforms that
> need it.
> 
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> Fixes: 3592d7e002438 ("ARM: 8082/1: TC2: test the MCPM loopback during boot")
> Cc: Nicolas Pitre <nico@xxxxxxxxxx>
> Cc: Kevin Hilman <khilman@xxxxxxxxxx>
> Cc: Liviu Dudau <liviu.dudau@xxxxxxx>
> Cc: Sudeep Holla <sudeep.holla@xxxxxxx>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
> ---
>  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
> 
> 

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