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

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Date:	Tue, 14 Oct 2014 23:23:40 +0200
From:	Heiko Stübner <heiko@...ech.de>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Kever Yang <kever.yang@...k-chips.com>,
	Sonny Rao <sonnyrao@...omium.org>,
	Addy Ke <addy.ke@...k-chips.com>,
	Eddie Cai <cf@...k-chips.com>, Jianqun Xu <xjq@...k-chips.com>,
	han jiang <hj@...k-chips.com>,
	Tao Huang <huangtao@...k-chips.com>,
	linux-rockchip@...ts.infradead.org,
	Russell King <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 4/6] ARM: rockchip: add basic smp support for rk3288

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@...k-chips.com> 
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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