lkml.org 
[lkml]   [2018]   [May]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 8/9] PM / Domains: Add support for multi PM domains per device to genpd
From
Date


On 05/23/2018 02:37 PM, Jon Hunter wrote:
>
> On 23/05/18 07:12, Ulf Hansson wrote:
>
> ...
>
>>>>>> Thanks for sending this. Believe it or not this has still been on my to-do list
>>>>>> and so we definitely need a solution for Tegra.
>>>>>>
>>>>>> Looking at the above it appears that additional power-domains exposed as devices
>>>>>> to the client device. So I assume that this means that the drivers for devices
>>>>>> with multiple power-domains will need to call RPM APIs for each of these
>>>>>> additional power-domains. Is that correct?
>>>>>
>>>>> They can, but should not!
>>>>>
>>>>> Instead, the driver shall use device_link_add() and device_link_del(),
>>>>> dynamically, depending on what PM domain that their original device
>>>>> needs for the current running use case.
>>>>>
>>>>> In that way, they keep existing runtime PM deployment, operating on
>>>>> its original device.
>>>>
>>>> OK, sounds good. Any reason why the linking cannot be handled by the above API? Is there a use-case where you would not want it linked?
>>>
>>> I am guessing the linking is what would give the driver the ability to decide which subset of powerdomains it actually wants to control
>>> at any point using runtime PM. If we have cases wherein the driver would want to turn on/off _all_ its associated powerdomains _always_
>>> then a default linking of all would help.
>>
>> First, I think we need to decide on *where* the linking should be
>> done, not at both places, as that would just mess up synchronization
>> of who is responsible for calling the device_link_del() at detach.
>>
>> Second, It would in principle be fine to call device_link_add() and
>> device_link_del() as a part of the attach/detach APIs. However, there
>> is a downside to such solution, which would be that the driver then
>> needs call the detach API, just to do device_link_del(). Of course
>> then it would also needs to call the attach API later if/when needed.
>> Doing this adds unnecessary overhead - comparing to just let the
>> driver call device_link_add|del() when needed. On the upside, yes, it
>> would put less burden on the drivers as it then only needs to care
>> about using one set of functions.
>>
>> Which solution do you prefer?
>
> Any reason why we could not add a 'boolean' argument to the API to indicate whether the new device should be linked? I think that I prefer the API handles it, but I can see there could be instances where drivers may wish to handle it themselves.
>
> Rajendra, do you have a use-case right now where the driver would want to handle the linking?

So if I understand this right, any driver which does want to control individual powerdomain state would
need to do the linking itself right?

What I am saying is, if I have device A, with powerdomains X and Y, and if I want to turn on only X,
then I would want only X to be linked with A, and at a later point if I want both X and Y to be turned on,
I would then go ahead and link both X and Y to A? Is that correct or did I get it all wrong?

I know atleast Camera on msm8996 would need to do this since it has 2 vfe powerdoamins, which can be
turned on one at a time (depending on what resolution needs to be supported) or both together if we
really need very high resolution using both vfe modules.

--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
hosted by The Linux Foundation

\
 
 \ /
  Last update: 2018-05-23 11:28    [W:0.081 / U:0.852 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site