[alsa-devel] [PATCH v4 4/5] ALSA: x86: hdmi: Add audio support for BYT and CHT

[Pierre-Louis Bossart]

On 1/20/17 5:15 AM, Takashi Iwai wrote:
> On Fri, 20 Jan 2017 23:22:31 +0100,
> Jerome Anand wrote:
>>
>> +	had_ops_v1 = had_ops_v1;	/* unused */
>
> Until now I didn't realize that the whole v1 stuff is never used in
> the current patchset.  Will it be ever used in future?  If not, can't
> we clean it up?  It's a bunch of codes, including the messy union
> definitions.  If there is no v3 or whatever, we can even get rid of
> the whole indirect calls.
>
> And if v1 (and the indirect ops calls) should be kept, actually what
> is the difference between v1 and v2, why both implementations do
> exist?  Please elaborate in comments.

v1 refers to Medfield/Clovertrail, v2 to Baytrail/CHT. The differences 
are minor and centered on different register definitions or additional 
features/bug corrections. We left the v1 code in so far but we could 
probably remove it since it's not tested anyway. The question is if we 
remove this v1 code and indirect calls now or later, I was planning to 
add DP audio support and making more changes would make the integration 
more difficult.