linux-kernel - Re: [PATCH v3 5/8] ARM: mediatek: add smp bringup code for MT6580

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Message-ID: <1438914494.1900.38.camel@mtkswgap22>
Date:	Fri, 7 Aug 2015 10:28:14 +0800
From:	Scott Shu <scott.shu@...iatek.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	Matthias Brugger <matthias.bgg@...il.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Mark Rutland <mark.rutland@....com>,
	<devicetree@...r.kernel.org>, <wsd_upstream@...iatek.com>,
	<scott.shu@...il.com>, <loda.chou@...iatek.com>,
	<linux-kernel@...r.kernel.org>, <jades.shih@...iatek.com>,
	<linux-mediatek@...ts.infradead.org>, <Mars.Cheng@...iatek.com>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 5/8] ARM: mediatek: add smp bringup code for MT6580

On Wed, 2015-08-05 at 10:44 +0100, Russell King - ARM Linux wrote:
> On Tue, Aug 04, 2015 at 09:54:21PM +0800, Scott Shu wrote:
> > Add support for cpu enable-method "mediatek,mt6580-smp" for booting
> > secondary CPUs on MT6580.
> 
> If you have CPU power domain support, and you power up and power down the
> CPUs, why do you need the boot_lock and pen_release stuff?  Isn't keeping
> the power off on a CPU sufficient to prevent it entering the kernel?
> 
Thanks Russell. Yes, the system works well after removing boot_lock and
pen_release. Will be fixed in next version. 

Scott

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