linux-kernel - Re: [PATCH 0/7] Add SMP bringup support for mt65xx socs

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Date:	Mon, 4 May 2015 09:48:43 +0200
From:	Matthias Brugger <matthias.bgg@...il.com>
To:	Yingjoe Chen <yingjoe.chen@...iatek.com>
Cc:	Mark Rutland <mark.rutland@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Russell King <linux@....linux.org.uk>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Jason Cooper <jason@...edaemon.net>,
	Catalin Marinas <catalin.marinas@....com>,
	Marc Carino <marc.ceeeee@...il.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-mediatek@...ts.infradead.org,
	srv_heupstream <srv_heupstream@...iatek.com>,
	Sascha Hauer <kernel@...gutronix.de>
Subject: Re: [PATCH 0/7] Add SMP bringup support for mt65xx socs

Hi Yingjoe,

2015-05-01 9:43 GMT+02:00 Yingjoe Chen <yingjoe.chen@...iatek.com>:
> This series add SMP brinup support for mediatek SoCs. This is based
> on v4.1-rc1.
>
> There are 2 similar but different SMP bringup up methods on Mediatek
> mt65xx and mt81xx. On MT8135 & MT8127, system boots with a trustzone
> firmware. Others, like MT6589, doesn't have trustzone, and run kernel
> directly in secure world.
>
> Patch 1~3 fix issues in mtk_timer(GPT) and enable arch timer support.
> Patch 4,5 add support for cpu enable-method "mediatek,mt65xx-smp" and
> "mediatek,mt81xx-tz-smp", which support Mediatek SMP bringup for non-TZ
> and TZ platform.
> Patch 6,7 finally enable SMP bringup for mt8135 and mt8127.
>
> Matthias Brugger (1):
>   arm: mediatek: enable gpt6 on boot up to make arch timer working
>
> Yingjoe Chen (6):
>   clocksource: mediatek: Don't run event_handler if it is NULL
>   clocksource: mediatek: Use GPT as sched clock source
>   devicetree: bindings: add new SMP enable method Mediatek SoC
>   ARM: mediatek: add smp bringup code
>   ARM: dts: mt8135: enable basic SMP bringup for mt8135
>   ARM: dts: mt8127: enable basic SMP bringup for mt8127
>

I tried on the mt8135 eval board but it fails to bring up the CPU.

When booting:
[    1.048588] CPU1: failed to come online
[    2.049914] CPU2: failed to come online
[    3.051245] CPU3: failed to come online

And from userspace:
/ # echo 1 > /sys/devices/system/cpu/cpu1/online
[   40.115142] CPU1: failed to come online
sh: write error: Input/output error
/ # echo 1 > /sys/devices/system/cpu/cpu2/online
[   44.667141] CPU2: failed to come online
sh: write error: Input/output error
/ # echo 1 > /sys/devices/system/cpu/cpu3/online
[   51.271141] CPU3: failed to come online
sh: write error: Input/output error

Please check again.

Cheers,
Matthias
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