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

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Message-ID: <20151109152953.GH16778@broadcom.com>
Date:	Mon, 9 Nov 2015 10:29:53 -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 Sat, Nov 07, 2015 at 12:41:21AM +0100, Hauke Mehrtens wrote:
> On 11/07/2015 12:27 AM, Hauke Mehrtens wrote:
> > On 11/06/2015 11:54 PM, Jon Mason wrote:
> >> 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?
> >>
> > 
> > I will send a separate patch adding all the workarounds for erratas in
> > the CPU core and the cache controller.
> > 
> > Hauke
> > 
> > 
> Hi,
> 
> BCM4708 uses a Cortex-A9 rev r3p0 and a L2C-310 rev r3p2. For this CPU
> and cache controller the same workaround are needed as for NSP, if you
> will resend this patch, please add all of them.

Agreed.  Kapil or I will mod the patch.

Thanks,
Jon

> 
> Hauke
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