linux-kernel - Re: Question about Tegra UCMs

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Date:   Wed, 19 May 2021 16:19:59 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Jaroslav Kysela <perex@...ex.cz>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Takashi Iwai <tiwai@...e.com>, Ion Agorria <ion@...rria.com>,
        Svyatoslav Ryhel <clamor95@...il.com>,
        Frank Rowand <frowand.list@...il.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        linux-tegra@...r.kernel.org, devicetree@...r.kernel.org,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        Rob Herring <robh@...nel.org>
Subject: Re: Question about Tegra UCMs

19.05.2021 14:38, Mark Brown пишет:
> On Wed, May 19, 2021 at 01:31:28AM +0300, Dmitry Osipenko wrote:
> 
>> Mark, could you please help me to understand the UCM naming scheme that ALSA uses..
> 
> I have no real idea, sorry.  Most of my userspace work has been with
> Android which doesn't use UCM.
> 
>> IIUC, the "ucm2/Tegra/codec_name" scheme [2] that the current ALSA UCM
>> uses simply doesn't work at all. Is there anything on the kernel side
>> that I could change to get a working naming scheme? If yes, I may try
>> to do something about it in the v2, thanks in advance.
> 
> Could you elaborate on the way in which it simply doesn't work at all?
> I'd expect there to be something in there that first tries to match on
> something to do with the specific hardware platform to take account of
> plastics differences but that'd be a userspace change.

I also expect that there should be some kind of fall back matching, but
I don't see it happening. I will work with Jaroslav on this trouble.

> Please fix your mail client to word wrap within paragraphs at something
> substantially less than 80 columns.  Doing this makes your messages much
> easier to read and reply to.
> 

I turned off the word wrapping for that email to make it more readable
in a generic email clients since it contained long lines which shouldn't
be wrapped.