[PATCH 2/2] ARM: iMX5 BBG: add cpuidle driver parameters

[Yong Shen]

On Tue, Feb 8, 2011 at 6:50 PM, Rob Herring <robherring2 at gmail.com> wrote:

> On 02/08/2011 09:51 AM, Yong Shen wrote:
>
>> Hi Arnaud,
>>
>> I also took a while to think about this before posting patches. I prefer
>> to put it in board related code since the various PMIC used on each
>> boards may have influence on cpuidle latency or other charactors,
>> although it could be minor.
>>
>>
> But you are not going to be doing voltage scaling in idle. Is it even
> possible to do sleeping operations like accessing a PMIC in idle?
>
I guess you are asking if modes like 'state retention' are possible for idle
state. so far there is no official mapping between c-states and various arm
idle states, which is something linaro power management group is working on.
Therefore I also treat 'state retention' as a c-state.

ps. remove lpdk in cc list to avoid auto-reply messages.
Yong

>
> The core is powergated, so lowering voltage would not help. Doing bus
> scaling or DDR self-refresh are the only likely additional operations.
>
> Rob
>
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