[RFC][PATCH 0/7] OMAP4 cpuidle cleanup

Santosh Shilimkar santosh.shilimkar at ti.com
Wed Mar 21 09:56:10 UTC 2012


On Wednesday 21 March 2012 03:21 PM, Daniel Lezcano wrote:
> On 03/21/2012 10:36 AM, Shilimkar, Santosh wrote:
>> On Wed, Mar 21, 2012 at 2:57 PM, Daniel Lezcano
>> <daniel.lezcano at linaro.org>  wrote:
>>> This patchset is a proposition to improve a bit the code.
>>> The changes are code cleanup and does not change the behavior of the
>>> driver itself.
>>>
>> Thanks. Will have a look at your series.
> 
> Cool, thanks.
> 
>>> A couple a things call my intention. Why the cpuidle device is set
>>> for cpu0 only
>> Because the mainline code CPUIDLE is supported along with CPUhotplug.
>> This is going to change though with Couple CPUIDLE and corresponding
>> OMAP updates.
> 
> Ok, thanks for the information. I will look deeper. What happens to cpu1
> when it is online and has nothing to do ?
> 
>>> and why the WFI is not used ?
>>>
>> I didn't get this question. Do you mean the generic WFI?
> 
I execute default idle loop.

> yes.
> 
>> If yes, then, it's mainly because OMAP need additional
>> custom barriers.
> 
> Ah, ok. I am not sure if it is possible but that may be cool if we can
> call cpu_do_idle instead with additional barrier.
>
There is no need. Since code around WFI is customised, it make no sense
to call cpu_do_idle(0 ofr only that instruction sake.

Regards
Santosh



More information about the linaro-dev mailing list