Re: [PATCH RFC 0/4] ALSA: Consolidate CEA channel allocation data

[Cássio Gabriel]

Hi, Iwai-san

On 6/12/26 06:13, Takashi Iwai wrote:
> On Fri, 12 Jun 2026 06:53:22 +0200,
> Cássio Gabriel wrote:
>>
>> HDA HDMI and Intel HDMI LPE maintain separate copies of the ordered
>> CEA-861 channel allocation descriptors, ELD speaker expansion, and
>> allocation selection logic. The Intel implementation originated from
>> the HDA code, but the copies now differ in supported allocation ranges
>> and fallback behavior.
>>
>> Move the common data and transformations alongside the PCM DRM ELD
>> helpers, then migrate both users while preserving their established
>> behavior. HDA retains the complete CA range and channel-count fallback.
>> Intel HDMI LPE retains its CA 0x1f limit, ELD speaker bits 0 through 6,
>> and lack of fallback for incompatible ELD data.
>>
>> The descriptors and their derived channel counts and speaker masks
>> become compile-time constants. This removes duplicated mutable
>> initialization and provides one authoritative allocation table without
>> changing the existing allocation-selection policy.
>>
>> No hardware was available to test this patch series.
>>
>> Signed-off-by: Cássio Gabriel <cassiogabrielcontato@xxxxxxxxx>
>> ---
>> Cássio Gabriel (4):
>>       ALSA: pcm: Add common CEA channel allocation helpers
>>       ALSA: hda: Make CEA channel allocation interfaces const
>>       ALSA: hda: Use common CEA channel allocations
>>       ALSA: x86: Use common CEA channel allocations
> 
> This looks like a nice cleanup.  There is similar code in
> sound/soc/codecs/hdmi-codec.c, too.  Can we integrate it further in
> future?

Yes, absolutely, and thanks for pointing that file.
I'll work on that.

-- 
Thanks,
Cássio

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