[alsa-devel] [PATCH v2 6/9] ASoC: tegra: add Tegra186 based DSPK driver

[Sameer Pujar]

On 2/7/2020 11:52 PM, Dmitry Osipenko wrote:
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> 07.02.2020 14:26, Sameer Pujar пишет:
>>
>> On 2/6/2020 10:45 PM, Dmitry Osipenko wrote:
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>>>
>>> 30.01.2020 13:33, Sameer Pujar пишет:
>>>> +static const struct dev_pm_ops tegra186_dspk_pm_ops = {
>>>> +     SET_RUNTIME_PM_OPS(tegra186_dspk_runtime_suspend,
>>>> +                        tegra186_dspk_runtime_resume, NULL)
>>>> +     SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
>>>> +                                  pm_runtime_force_resume)
>>>> +};
>>> Could you please explain why drivers need the "late" system sleep?
>> It was done to ensure core drivers are suspended first and defer the
>> codec driver suspend
> Suspend order is opposite to the drivers registration order. If there is
> no real problem with that, then you should use the default suspend

> level. Please don't try to fix a non-existent problems.

No. This was done specifically to allow sound core to first stop any 
ongoing audio activity during normal suspend and ensure a safe suspend 
of AHUB devices by doing a LATE suspend.