[PATCH 2/4] ALSA: hda: Make snd_hda_codec_device_init() the only codec constructor

[Cezary Rojewski]

On 2022-07-20 3:13 PM, Takashi Iwai wrote:
> On Wed, 20 Jul 2022 15:06:20 +0200,
> Cezary Rojewski wrote:
>>
>> Refactor snd_hdac_ext_bus_device_init() so that it makes use of
>> snd_hda_codec_device_init() to create and initialize new codec device.
>> Causes the latter to become the sole codec device constructor.
>>
>> Users of the refactored function are updated accordingly and now also
>> take responsibility for assigning driver's private data as that task is
>> no longer performed by hdac_hda_dev_probe().
> 
> Hrm, this doesn't look really right.  It means you'll introduce a hard
> dependency chain in a reverse order: snd-hda-ext-core ->
> snd-hda-codec.
> 
> Originally, the ext bus code was written completely independent from
> the legacy HD-audio implementations, and hdac-hda driver was a kind of
> wrapper / bridge for the legacy codec over the ext bus.  If we want
> change this rule and make the legacy HD-audio codec always tied with
> the ext bus, a likely better way would be to call
> snd_hda_codec_device_init() in the caller's side (e.g. skl or sof),
> then pass the newly created codec object to
> snd_hdac_ext_bus_device_init() for further initialization.


Agree. That or drop the snd_hdac_ext_bus_device_init() entirely. Will 
send an update soon.

In regard to the other subject, my plan:
- separate code used by both ALSA/ASoC into sound/hda (this includes 
many hda_codec functions)
- combine hda_bus and hdac_bus
- combine hda_codec and hdac_device
- drop HDA_DEV_ASOC
- drop hdac_hda/hdac_hdmi (once skylake-driver is gone; sof will be 
updated accordingly)
<story does not end here>


Regards,
Czarek