From: Sergei Shtylyov <sshtylyov@ru.mvista.com>
To: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org, Nico Coesel <ncoesel@DEALogic.nl>
Subject: Re: FW: Alchemy power managment code.
Date: Fri, 28 Mar 2008 14:36:08 +0300 [thread overview]
Message-ID: <47ECD828.8090600@ru.mvista.com> (raw)
In-Reply-To: <20080327223134.GA26997@linux-mips.org>
Hello.
Ralf Baechle wrote:
>> > The TOY cpunter 0 clockevent driver is also need to be written for
>>>the recent kernel as CP0 timer stops ticking after wait insn is executed
>>>-- see arch/mips/au1000/common/time.c...
>> And here's found another possible issue with Alchemy PM -- the CP0
>>counter counts at unpredictable frequency in idle state (after executing
>>"wait"), so the MIPS clocksource will probably be unstable?
> Correct - and cevt-r4k won't be usable either. I guess that means you
> leave the user the choice between either these two or using wait. Not
> nice but ...
The Alchemy code doesn't even try to use CP0 counter when CONFIG_PM=y if
you look into arch/mips/au1000/common/time.c... or at least it didn't before
Atsushi removed do_fast_pm_gettimeoffset().
> Ralf
WBR, Sergei
next prev parent reply other threads:[~2008-03-28 11:35 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-13 16:16 FW: Alchemy power managment code Nico Coesel
2008-03-13 16:16 ` Nico Coesel
2008-03-13 16:45 ` Sergei Shtylyov
2008-03-24 14:23 ` Sergei Shtylyov
2008-03-24 14:31 ` Sergei Shtylyov
2008-03-27 22:31 ` Ralf Baechle
2008-03-28 11:36 ` Sergei Shtylyov [this message]
2008-03-28 13:32 ` Ralf Baechle
2008-03-28 14:25 ` Atsushi Nemoto
2008-03-28 15:14 ` Sergei Shtylyov
2008-03-26 16:31 ` FW: " Sergei Shtylyov
2008-03-27 22:32 ` Ralf Baechle
2008-03-28 11:39 ` Sergei Shtylyov
-- strict thread matches above, loose matches on Subject: below --
2008-03-27 13:46 Nico Coesel
2008-03-27 13:46 ` Nico Coesel
2008-03-27 16:41 ` Sergei Shtylyov
2008-03-27 22:33 ` Ralf Baechle
2008-03-28 8:21 Nico Coesel
2008-03-28 8:21 ` Nico Coesel
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=47ECD828.8090600@ru.mvista.com \
--to=sshtylyov@ru.mvista.com \
--cc=linux-mips@linux-mips.org \
--cc=ncoesel@DEALogic.nl \
--cc=ralf@linux-mips.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