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Re: FW: Alchemy power managment code.

To: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Subject: Re: FW: Alchemy power managment code.
From: Ralf Baechle <ralf@linux-mips.org>
Date: Thu, 27 Mar 2008 22:31:35 +0000
Cc: linux-mips@linux-mips.org, Nico Coesel <ncoesel@DEALogic.nl>
In-reply-to: <47E7BB4B.3080507@ru.mvista.com>
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References: <19CA9E279FDA5246B7D7A1C91A4AF7F40EF804@dealogicserver.DEALogic.nl> <47E7B970.30105@ru.mvista.com> <47E7BB4B.3080507@ru.mvista.com>
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On Mon, Mar 24, 2008 at 05:31:39PM +0300, Sergei Shtylyov 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 ...

  Ralf

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