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Re: [PATCH 2/2] ARM: cpuidle: Support asymmetric idle definition

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  Re: [PATCH 2/2] ARM: cpuidle: Support asymmetric idle definition Daniel Lezcano <daniel.lezcano@linaro.org> - 2017-06-22 14:30 +0200
    Re: [PATCH 2/2] ARM: cpuidle: Support asymmetric idle definition "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-06-22 16:40 +0200

#1672591 — Re: [PATCH 2/2] ARM: cpuidle: Support asymmetric idle definition

On 12/06/2017 20:49, Rafael J. Wysocki wrote:
> On Monday, June 12, 2017 05:55:10 PM Daniel Lezcano wrote:
>> Some hardware have clusters with different idle states. The current code does
>> not support this and fails as it expects all the idle states to be identical.
>>
>> Because of this, the Mediatek mtk8173 had to create the same idle state for a
>> big.Little system and now the Hisilicon 960 is facing the same situation.
>>
>> Solve this by simply assuming the multiple driver will be needed for all the
>> platforms using the ARM generic cpuidle driver which makes sense because of the
>> different topologies we can support with a single kernel for ARM32 or ARM64.
>>
>> Every CPU has its own driver, so every single CPU can specify in the DT the
>> idle states.
>>
>> This simple approach allows to support the future dynamIQ system, current SMP
>> and HMP.
>>
>> Tested on:
>>  - 96boards: Hikey 620
>>  - 96boards: Hikey 960
>>  - 96boards: dragonboard410c
>>  - Mediatek 8173
>>
>> Cc: Sudeep Holla <sudeep.holla@arm.com>
>> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
>> Tested-by: Leo Yan <leo.yan@linaro.org>
>> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
> 
> There seems to have been quite some discussion regarding this one and I'm not
> sure about the resolution of it.
> 
> I'd feel more comfortable with an ACK or Reviewed-by from Sudeep or Lorenzo here.


Hi Rafael,

just a gentle reminder, Sudeep acked the patch.

Thanks.

  -- Daniel


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#1672692

On Thursday, June 22, 2017 02:25:19 PM Daniel Lezcano wrote:
> On 12/06/2017 20:49, Rafael J. Wysocki wrote:
> > On Monday, June 12, 2017 05:55:10 PM Daniel Lezcano wrote:
> >> Some hardware have clusters with different idle states. The current code does
> >> not support this and fails as it expects all the idle states to be identical.
> >>
> >> Because of this, the Mediatek mtk8173 had to create the same idle state for a
> >> big.Little system and now the Hisilicon 960 is facing the same situation.
> >>
> >> Solve this by simply assuming the multiple driver will be needed for all the
> >> platforms using the ARM generic cpuidle driver which makes sense because of the
> >> different topologies we can support with a single kernel for ARM32 or ARM64.
> >>
> >> Every CPU has its own driver, so every single CPU can specify in the DT the
> >> idle states.
> >>
> >> This simple approach allows to support the future dynamIQ system, current SMP
> >> and HMP.
> >>
> >> Tested on:
> >>  - 96boards: Hikey 620
> >>  - 96boards: Hikey 960
> >>  - 96boards: dragonboard410c
> >>  - Mediatek 8173
> >>
> >> Cc: Sudeep Holla <sudeep.holla@arm.com>
> >> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> >> Tested-by: Leo Yan <leo.yan@linaro.org>
> >> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
> > 
> > There seems to have been quite some discussion regarding this one and I'm not
> > sure about the resolution of it.
> > 
> > I'd feel more comfortable with an ACK or Reviewed-by from Sudeep or Lorenzo here.
> 
> 
> Hi Rafael,
> 
> just a gentle reminder, Sudeep acked the patch.

Yes, I'll get to it later today, most likely.

Thanks,
Rafael

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