Re: [PATCH v4 4/6] ARM: rockchip: add basic smp support for rk3288

[Heiko Stübner]

Am Dienstag, 14. Oktober 2014, 13:24:03 schrieb Doug Anderson:
> Kever,
> 
> On Mon, Oct 13, 2014 at 1:12 PM, Kever Yang <kever.yang@xxxxxxxxxxxxxx> 
wrote:
> > +       /*
> > +        * We need to soft reset the cpu when we turn off the cpu power
> > domain, +        * or else the active processors might be stalled when
> > the individual +        * processor is powered down.
> > +        */
> > +       if (read_cpuid_part_number() != ARM_CPU_PART_CORTEX_A9) {
> 
> I haven't done a full review of this patch, but it seems unlikely that
> your uses of read_cpuid_part_number() and read_cpuid_part() in this
> patch are correct.  You use both functions and in both cases compare
> the results to ARM_CPU_PART_CORTEX_A9.

I think read_cpuid_part() would be the correct one, as it does

	read_cpuid_id() & ARM_CPU_PART_MASK

which in turn should mask the correct parts of the cpuid to match against 
ARM_CPU_PART_CORTEX_A9 [0].



[0] http://lxr.free-electrons.com/source/arch/arm/include/asm/cputype.h#L77
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