From: Segher Boessenkool <segher@kernel.crashing.org>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@ozlabs.org,
Johannes Berg <johannes@sipsolutions.net>,
Paul Mackerras <paulus@samba.org>
Subject: Re: [PATCH] powermac: support G5 CPU hotplug
Date: Thu, 3 May 2007 18:49:00 +0200 [thread overview]
Message-ID: <3796663898c24f426d39466404271eb2@kernel.crashing.org> (raw)
In-Reply-To: <1178158307.17299.55.camel@localhost.localdomain>
>> Isn't it just a GPIO, like on older Macs? Of course, we
>> cannot bring a CPU back online after doing that so it's
>> pretty useless I suppose.
>
> We don't know for sure what the gpio does... wether it does a CPU soft
> reset or tickles the SPU to make it do special things that cause us to
> branch at 0x100. We do get the CPU back after that though. We use that
> to bring them in after boot.
Yeah. It's probably the SRESET pin, come to think of it.
It doesn't seem logical that this would save more power
than (deep) NAP mode, so forget the whole idea. Or
someone could measure it if they think it might help
still.
Segher
next prev parent reply other threads:[~2007-05-03 16:49 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-27 11:25 patches for 2.6.22 Paul Mackerras
2007-04-27 12:00 ` Johannes Berg
2007-04-27 21:41 ` [PATCH] powerpc: fix suspend states again Johannes Berg
2007-04-27 21:53 ` Olof Johansson
2007-04-27 21:54 ` Johannes Berg
2007-04-27 21:57 ` Olof Johansson
2007-04-27 22:00 ` [PATCH] powerpc: put enable_kernel_spe into a header Johannes Berg
2007-04-27 22:02 ` [PATCH v2] powerpc: fix suspend states again Johannes Berg
2007-04-27 23:13 ` Olof Johansson
2007-04-30 0:14 ` Paul Mackerras
2007-04-30 11:35 ` Johannes Berg
2007-04-30 11:37 ` [PATCH v3] " Johannes Berg
2007-05-01 14:16 ` Johannes Berg
2007-04-27 23:42 ` patches for 2.6.22 Arnd Bergmann
2007-04-28 2:49 ` [PATCH] cell: cbe_cpufreq cleanup and crash fix Arnd Bergmann
2007-04-28 7:49 ` [PATCH] powermac: proper sleep management Johannes Berg
2007-04-28 8:08 ` Paul Mackerras
2007-04-28 12:52 ` Johannes Berg
2007-04-28 8:38 ` Benjamin Herrenschmidt
2007-04-28 12:51 ` Johannes Berg
2007-04-28 12:01 ` Paul Mackerras
2007-04-28 13:46 ` Johannes Berg
2007-04-30 5:31 ` Paul Mackerras
2007-04-30 12:08 ` Johannes Berg
2007-05-01 12:14 ` Paul Mackerras
2007-05-01 12:24 ` Johannes Berg
2007-04-30 11:44 ` [PATCH v3] " Johannes Berg
2007-05-01 8:55 ` Johannes Berg
2007-04-30 19:51 ` patches for 2.6.22 Kim Phillips
2007-05-01 3:38 ` Paul Mackerras
2007-05-02 14:12 ` Kumar Gala
2007-05-02 14:19 ` Kim Phillips
2007-05-01 9:06 ` Johannes Berg
2007-05-02 5:33 ` [PATCH] adb: replace sleep notifier with platform driver suspend/resume hooks Johannes Berg
2007-05-02 5:34 ` [PATCH] apm_emu: use generic apm-emulation Johannes Berg
2007-05-02 5:36 ` [PATCH] via-pmu: remove LED sleep notifier Johannes Berg
2007-05-02 10:57 ` Stephen Rothwell
2007-05-02 14:32 ` [PATCH v2] " Johannes Berg
2007-05-07 8:47 ` Paul Mackerras
2007-05-07 8:58 ` Johannes Berg
2007-05-07 15:08 ` [PATCH v3] " Johannes Berg
2007-05-02 5:39 ` [PATCH] remove awacs dmasound Johannes Berg
2007-05-02 6:18 ` [PATCH] via-pmu: kill sleep notifiers completely Johannes Berg
2007-05-02 6:21 ` [PATCH] powermac: support G5 CPU hotplug Johannes Berg
2007-05-02 10:55 ` Paul Mackerras
2007-05-02 14:33 ` Johannes Berg
2007-05-02 17:57 ` Segher Boessenkool
2007-05-02 22:03 ` Benjamin Herrenschmidt
2007-05-02 23:47 ` Segher Boessenkool
2007-05-02 23:59 ` Benjamin Herrenschmidt
2007-05-03 0:05 ` Segher Boessenkool
2007-05-03 0:18 ` Benjamin Herrenschmidt
2007-05-03 0:01 ` Paul Mackerras
2007-05-03 0:08 ` Benjamin Herrenschmidt
2007-05-03 0:10 ` Benjamin Herrenschmidt
2007-05-03 0:19 ` Segher Boessenkool
2007-05-03 0:17 ` Segher Boessenkool
2007-05-03 0:21 ` Benjamin Herrenschmidt
2007-05-03 0:24 ` Benjamin Herrenschmidt
2007-05-03 1:01 ` Segher Boessenkool
2007-05-03 2:11 ` Benjamin Herrenschmidt
2007-05-03 16:49 ` Segher Boessenkool [this message]
2007-05-02 20:33 ` [PATCH v2] " Johannes Berg
2007-05-02 6:33 ` [PATCH] powerpc: MPIC sys_device & suspend/resume Johannes Berg
2007-05-02 6:35 ` [PATCH] powermac: fix G5-cpufreq for cpu on/offline Johannes Berg
2007-05-03 12:25 ` patches for 2.6.22 Johannes Berg
2007-05-03 12:28 ` [PATCH] powerpc: dart iommu suspend Johannes Berg
2007-05-03 12:30 ` Benjamin Herrenschmidt
2007-05-03 12:34 ` Johannes Berg
2007-05-03 12:34 ` Benjamin Herrenschmidt
2007-05-03 12:48 ` Johannes Berg
2007-05-03 14:24 ` Olof Johansson
2007-05-04 10:51 ` Johannes Berg
2007-05-03 12:29 ` [PATCH] powerpc: mark pages that don't exist as nosave Johannes Berg
2007-05-03 12:31 ` [PATCH] powermac: suspend to disk on G5 Johannes Berg
2007-07-17 13:28 ` [PATCH] remove awacs dmasound Johannes Berg
2007-07-17 13:37 ` Adrian Bunk
2007-07-17 13:43 ` Johannes Berg
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=3796663898c24f426d39466404271eb2@kernel.crashing.org \
--to=segher@kernel.crashing.org \
--cc=benh@kernel.crashing.org \
--cc=johannes@sipsolutions.net \
--cc=linuxppc-dev@ozlabs.org \
--cc=paulus@samba.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).