Re: [RFC WIP PATCH] venus: add qcom,no-low-power property

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On 20/02/2024 12:37, Krzysztof Kozlowski wrote:

> On 20/02/2024 12:21, Bryan O'Donoghue wrote:
>
>> On 20/02/2024 10:56 a.m., Marc Gonzalez wrote:
>>
>>> On 19/02/2024 20:24, Bryan O'Donoghue wrote:
>>>
>>>> On 19/02/2024 5:44 p.m., Dmitry Baryshkov wrote:
>>>>
>>>>> On Mon, 19 Feb 2024 at 19:29, Konrad Dybcio wrote:
>>>>>>
>>>>>> On 19.02.2024 18:18, Marc Gonzalez wrote:
>>>>>>
>>>>>>> On our msm8998-based device, calling venus_sys_set_power_control()
>>>>>>> breaks playback. Since the vendor kernel never calls it, we assume
>>>>>>> it should not be called for this device/FW combo.
>>>>>>
>>>>>> FWIW, this is also broken on other SoCs.. 8280/8350 and 6115
>>>>>> to name a couple.
>>>>>
>>>>> Then let's just disable it until it gets unbroken?
>>>>
>>>> Its functional on most of our upstream stuff though, why switch if off
>>>> unless necessary ?
>>>>
>>>> Maybe it should be an opt-in instead of an opt-out, TBH my own feeling
>>>> is its better to minimize the amount of work and opt as per the proposed
>>>> patch.
>>>>
>>>> Perhaps the qcom vidc team can give insights on 8280xp and 8350 when we
>>>> come to tackling new HFI6XX and later SoCs ...
>>>
>>> I was wondering if the chosen property name might cause issues later...
>>>
>>> Thinking "qcom,no-low-power" might be a bit too general?
>>> Perhaps would need to mention venus somewhere in the name,
>>> to limit this to the video decoder?
>>
>> Yep, the word venus should probably appear in the property name.
> 
> This is RFC, so I am ignoring it, but just in case before you send v2
> with the same:
> 
> You described the desired Linux feature or behavior, not the actual
> hardware. The bindings are about the latter, so instead you need to
> rephrase the property and its description to match actual hardware
> capabilities/features/configuration etc.

I added the RFC tag explicitly because I was hoping for the DT folks
and msm maintainers to comment on the property name ;)

Thanks for your comment!

Here's the proposal for v2:

qcom,venus-broken-low-power-mode

Description:
This property is defined for devices where playback does not work
when the video decoder is in low power mode.

Regards





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