linux-kernel - Re: [PATCH] ARM: brcmstb: update CPU power management sequence

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Message-ID: <CADtm3G5ZaOsJ_pvY2ho0yYhbhbqtCwsPZfnEc0rwhCBC1ho16g@mail.gmail.com>
Date:	Wed, 17 Dec 2014 15:25:09 -0800
From:	Gregory Fong <gregory.0xf0@...il.com>
To:	Brian Norris <computersforpeace@...il.com>
Cc:	Florian Fainelli <f.fainelli@...il.com>,
	Russell King <linux@....linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] ARM: brcmstb: update CPU power management sequence

On Tue, Dec 16, 2014 at 7:13 PM, Brian Norris
<computersforpeace@...il.com> wrote:
> The automatic CPU power state machine for B15 CPUs does not work
> reliably as-is. This patch implements a manual sequence in software to
> replace it.
>
> This was tested successfully with over 10,000 hotplug cycles of
> something like this:
>
>   echo 0 > /sys/devices/system/cpu/cpu1/online
>   echo 1 > /sys/devices/system/cpu/cpu1/online
>
> whereas the existing sequence often locks up after a few hundred cycles.
>
> Fixes: 62639c2f5332 ("ARM: brcmstb: reintroduce SMP support")
> Signed-off-by: Brian Norris <computersforpeace@...il.com>

Acked-by: Gregory Fong <gregory.0xf0@...il.com>
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