[PATCH v2 09/21] ASoC: apple: Add macaudio machine driver

[James Calligeros]

Hi,

On Friday, 9 October 2026 9:52:09 pm Australian Eastern Standard Time Cezary 
Rojewski wrote:
> macaudio_dpcm_hw_params()
> macaudio_be_hw_free()
> 	both can access the card from the substream/dai without
> 	relying on the ma-context
> 
> macaudio_parse_of()
> macaudio_parse_of_be_dai_link()
> 	called in context which creates the very card

I have fixed all of these by copying what rockchip/rockchip_max98090.c
does to initialise the card, however

> macaudio_vlimit_enable_timeout()
> macaudio_vlimit_disable_timeout()
> macaudio_vlimit_update()
> 	called in context of delayed part of the trigger() callback.
> 	I'd need more information on the trigger() implementation of
> 	yours to present a solution. See the comments below.

are slightly more difficult to deal with. These are called from workqueues
which only have reference to the driver data struct. Other than keeping a
pointer to the card around, I'm not sure how else to deal with this other
than keeping a pointer to card around in the driver data struct.

> Please correct me if I'm wrong but it seems the scheduled work does
> speaker-volume operations only. Moreover, it seems that
> ->lock_update_work may schedule a follow up work in form of
> ->lock_timeout_work. Are you sure trigger() is the right place to do
> volume-control in delayed manner?

The intention here is to activate the timeout when the stream starts
so that if speakersafetyd dies at any point during playback, the speaker
volume(s) are limited to prevent damage. We only want this running when
speaker playback starts and we need to disable it when that playback stops,
so trigger() seems like the natural place for this.

James