linux-kernel - Re: [PATCH 1/3] ALSA: pcm: add snd_pcm_add_chmap_ctls_with

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Message-ID: <87ttwqgfxh.wl-tiwai@suse.de>
Date:   Sat, 06 May 2023 07:57:46 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     broonie@...nel.org, tiwai@...e.com, perex@...ex.cz,
        lgirdwood@...il.com, ckeepax@...nsource.cirrus.com,
        kuninori.morimoto.gx@...esas.com, linux-kernel@...r.kernel.org,
        pierre-louis.bossart@...ux.intel.com, alsa-devel@...a-project.org
Subject: Re: [PATCH 1/3] ALSA: pcm: add snd_pcm_add_chmap_ctls_with_prefix

On Fri, 05 May 2023 18:55:12 +0200,
Srinivas Kandagatla wrote:
> 
> On Qualcomm SoC which has multiple Display Port controllers, using
> snd_pcm_add_chmap_ctls() to add chmap controls from every ASoC hdmi codec
> instance for a give card fails while adding second instance as the control
> with same name "Playback Channel Map" already exists from the first instance.
> 
> Fix this by adding a new api wrapper to pass ASoC component name prefix to
> avoid such duplicate control naming.

It implies that you have conflicting PCM objects with the same PCM
device number from the same card.  How can it be?


Takashi