[PATCH 13/17] ASoC: Intel: avs: Dynamic firmware resources management

[Cezary Rojewski]

On 2022-02-25 9:21 PM, Pierre-Louis Bossart wrote:
>>>> +static int avs_dsp_enable(struct avs_dev *adev, u32 core_mask)
>>>> +{
>>>> +    u32 mask;
>>>> +    int ret;
>>>> +
>>>> +    ret = avs_dsp_core_enable(adev, core_mask);
>>>> +    if (ret < 0)
>>>> +        return ret;
>>>> +
>>>> +    mask = core_mask & ~AVS_MAIN_CORE_MASK;
>>>
>>> so here BIT(MAIN_CORE) is zero in mask
>>
>>
>> What's wrong with AVS_MAIN_CORE_MASK being used explicitly?
>>
>>>> +    if (!mask)
>>>> +        /*
>>>> +         * without main core, fw is dead anyway
>>>> +         * so setting D0 for it is futile.
>>>
>>> I don't get the comment, you explicitly discarded the main core with
>>> your logical AND above, so this test means that all other non-main cores
>>> are disabled.
>>
>> There is no setting D0 for MAIN_CORE as firmware is not operational
>> without it. Firmware needs to be notified about D3 -> D0 transitions
>> only in case of non-MAIN_COREs.
> 
> the comment was about 'without main core'.
> 
> This is difficult to follow, because you've discarded the main code in
> the if (!mask), so that's an always-true case, which makes the rest of
> the explanations not so clear.


I'm afraid, not seeing the problem. It's clearly not always-true 
statement as 'mask' can be non-zero after discarding the MAIN_CORE.