linux-kernel - Re: [PATCH 1/3] ALSA: pcm: add support for 128kHz sample rate

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Date: Mon, 1 Jul 2024 10:50:02 +0200
From: Amadeusz Sławiński
 <amadeuszx.slawinski@...ux.intel.com>
To: Jerome Brunet <jbrunet@...libre.com>, Mark Brown <broonie@...nel.org>,
 Liam Girdwood <lgirdwood@...il.com>, Takashi Iwai <tiwai@...e.com>,
 Jaroslav Kysela <perex@...ex.cz>
Cc: alsa-devel@...a-project.org, linux-sound@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] ALSA: pcm: add support for 128kHz sample rate

On 6/28/2024 2:23 PM, Jerome Brunet wrote:
> The usual sample rate possible on an SPDIF link are
> 32k, 44.1k, 48k, 88.2k, 96k, 172.4k and 192k.
> 
> With higher bandwidth variant, such as eARC, and the introduction of 8
> channels mode, the spdif frame rate may be multiplied by 4. This happens
> when the interface use an IEC958_SUBFRAME format.
> 
> The spdif 8 channel mode rate list is:
> 128k, 176.4k, 192k, 352.8k, 384k, 705.4k and 768k.
> 
> All are already supported by ASLA expect for the 128kHz one.
> Add support for it but do not insert it the SNDRV_PCM_RATE_8000_192000
> macro. Doing so would silently add 128k support to a lot of HW which
> probably do not support it.
> 
> Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
> ---

 From what I remember the recommendation is to not add new rates, but 
use SNDRV_PCM_RATE_KNOT for all rates not included already.