Re: [PATCH 1/3] ALSA: hda/tegra: Skip reset on BPMP devices

Sameer Pujar
2021-12-14T06:02:50Z

On 12/8/2021 5:35 PM, Dmitry Osipenko wrote:
> 08.12.2021 08:22, Sameer Pujar пишет:
>>
>> On 12/7/2021 11:32 PM, Dmitry Osipenko wrote
>>> If display is already active, then shared power domain is already
>>> ungated.
>> If display is already active, then shared power domain is already
>> ungated. HDA reset is already applied during this ungate. In other
>> words, HDA would be reset as well when display ungates power-domain.
> Now, if you'll reload the HDA driver module while display is active,
> you'll get a different reset behaviour. HDA hardware will be reset on
> pre-T186, on T186+ it won't be reset.

How the reset behavior is different? At this point when HDA driver is
loaded the HW is already reset during display ungate. What matters,
during HDA driver load, is whether the HW is in predictable state or not
and the answer is yes. So I am not sure what problem you are referring
to. Question is, if BPMP already ensures this, then why driver needs to
take care of it.