From: York Sun <yorksun@freescale.com>
To: Dongsheng Wang <dongsheng.wang@freescale.com>,
<scottwood@freescale.com>, <leoli@freescale.com>
Cc: linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH] fsl/smp: add low power boot support to replace spin boot
Date: Thu, 15 Jan 2015 09:08:36 -0800 [thread overview]
Message-ID: <54B7F414.2020609@freescale.com> (raw)
In-Reply-To: <1421301930-10035-1-git-send-email-dongsheng.wang@freescale.com>
On 01/14/2015 10:05 PM, Dongsheng Wang wrote:
> From: Wang Dongsheng <dongsheng.wang@freescale.com>
>
> U-boot put non-boot cpus into an low power state(PW10/PW20 or DOZE) when cpu
> powered up. To exit low power state kernel will send DOORBELL or MPIC-IPI
> signal to all those CPUs.
>
> e500/e500v2 use mpic to send IPI signal.
> e500mc and later use doorbell to send IPI signal.
>
> This feature tested on:
> POWER UP TEST:
> P1022DS(e500v2),96k times.
> P4080(e500mc), 110k times.
> T1024(e5500), 83k times.
> T4240(e6500), 150k times.
>
> CPU HOTPLUG TEST:
> P1022DS(e500v2),1.4 million times.
> P4080(e500mc), 1.8 million times.
> T1024(e5500), 1.3 million times.
> T4240(e6500), 1.1 million times.
>
> Signed-off-by: Wang Dongsheng <dongsheng.wang@freescale.com>
>
This is a very good move. Can you explain what has been tested for 100K times,
or over a million times?
Have you verified on older e500v2 platforms, such as MPC8572?
York
next prev parent reply other threads:[~2015-01-15 17:23 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-15 6:05 [PATCH] fsl/smp: add low power boot support to replace spin boot Dongsheng Wang
2015-01-15 6:46 ` Dongsheng.Wang
2015-01-15 17:08 ` York Sun [this message]
2015-01-16 2:49 ` Dongsheng.Wang
2015-01-20 0:46 ` Scott Wood
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