linux-kernel - Re: [PATCH v3 4/4] ARM: BCM: Add SMP support for Broadcom 4708

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Message-ID: <20151106225419.GP8792@broadcom.com>
Date:	Fri, 6 Nov 2015 17:54:20 -0500
From:	Jon Mason <jonmason@...adcom.com>
To:	Hauke Mehrtens <hauke@...ke-m.de>
CC:	Kapil Hali <kapilh@...adcom.com>, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	"Ian Campbell" <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Ray Jui <rjui@...adcom.com>,
	"Scott Branden" <sbranden@...adcom.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Gregory Fong <gregory.0xf0@...il.com>,
	Lee Jones <lee@...nel.org>,
	"Kever Yang" <kever.yang@...k-chips.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Olof Johansson <olof@...om.net>,
	"Paul Walmsley" <paul@...an.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Chen-Yu Tsai <wens@...e.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>,
	<bcm-kernel-feedback-list@...adcom.com>
Subject: Re: [PATCH v3 4/4] ARM: BCM: Add SMP support for Broadcom 4708

On Fri, Nov 06, 2015 at 10:42:41PM +0100, Hauke Mehrtens wrote:
> On 11/06/2015 10:11 PM, Kapil Hali wrote:
> > From: Jon Mason <jonmason@...adcom.com>
> > 
> > Add SMP support for Broadcom's 4708 SoCs.
> > 
> > Signed-off-by: Jon Mason <jonmason@...adcom.com>
> > Acked-by: Hauke Mehrtens <hauke@...ke-m.de>
> > Tested-by: Hauke Mehrtens <hauke@...ke-m.de>
> > Signed-off-by: Kapil Hali <kapilh@...adcom.com>
> 
> I tested this on a Netgear R6250 V1 (BCM4708) and SMP worked.
> 
> > ---
> >  arch/arm/boot/dts/bcm4708.dtsi | 2 ++
> >  arch/arm/mach-bcm/Kconfig      | 1 +
> >  arch/arm/mach-bcm/Makefile     | 3 +++
> >  3 files changed, 6 insertions(+)
> > 
> 
> ...
> 
> > --- a/arch/arm/mach-bcm/Kconfig
> > +++ b/arch/arm/mach-bcm/Kconfig
> > @@ -54,6 +54,7 @@ config ARCH_BCM_NSP
> >  config ARCH_BCM_5301X
> >  	bool "Broadcom BCM470X / BCM5301X ARM SoC" if ARCH_MULTI_V7
> >  	select ARCH_BCM_IPROC
> 
> You activated ARM_ERRATA_764369 for NSP is this not needed for NS?

I'm not certain the CPU version, and without that it is difficult to
know what errata's are present in the underlying hardware.  My guess
is that all present in NSP are present in NS (for UP and SMP).  This
would put it as:
        select ARM_ERRATA_754322
        select ARM_ERRATA_775420
        select ARM_ERRATA_764369 if SMP

Would you like me to have them added?

Thanks,
Jon

> 
> 
> > +	select HAVE_SMP
> >  	help
> >  	  Support for Broadcom BCM470X and BCM5301X SoCs with ARM CPU cores.
> >  
> 
> ...
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