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

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Date: Fri, 28 Jun 2024 14:23:06 +0200
From: Jerome Brunet <jbrunet@...libre.com>
To: Mark Brown <broonie@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Takashi Iwai <tiwai@...e.com>,
	Jaroslav Kysela <perex@...ex.cz>
Cc: Jerome Brunet <jbrunet@...libre.com>,
	alsa-devel@...a-project.org,
	linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] ALSA: pcm: add support for 128kHz sample rate

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>
---
 include/sound/pcm.h     | 13 +++++++------
 sound/core/pcm_native.c |  6 +++---
 2 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index 3edd7a7346da..9cda92b34eda 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -116,12 +116,13 @@ struct snd_pcm_ops {
 #define SNDRV_PCM_RATE_64000		(1U<<8)		/* 64000Hz */
 #define SNDRV_PCM_RATE_88200		(1U<<9)		/* 88200Hz */
 #define SNDRV_PCM_RATE_96000		(1U<<10)	/* 96000Hz */
-#define SNDRV_PCM_RATE_176400		(1U<<11)	/* 176400Hz */
-#define SNDRV_PCM_RATE_192000		(1U<<12)	/* 192000Hz */
-#define SNDRV_PCM_RATE_352800		(1U<<13)	/* 352800Hz */
-#define SNDRV_PCM_RATE_384000		(1U<<14)	/* 384000Hz */
-#define SNDRV_PCM_RATE_705600		(1U<<15)	/* 705600Hz */
-#define SNDRV_PCM_RATE_768000		(1U<<16)	/* 768000Hz */
+#define SNDRV_PCM_RATE_128000		(1U<<11)	/* 128000Hz */
+#define SNDRV_PCM_RATE_176400		(1U<<12)	/* 176400Hz */
+#define SNDRV_PCM_RATE_192000		(1U<<13)	/* 192000Hz */
+#define SNDRV_PCM_RATE_352800		(1U<<14)	/* 352800Hz */
+#define SNDRV_PCM_RATE_384000		(1U<<15)	/* 384000Hz */
+#define SNDRV_PCM_RATE_705600		(1U<<16)	/* 705600Hz */
+#define SNDRV_PCM_RATE_768000		(1U<<17)	/* 768000Hz */
 
 #define SNDRV_PCM_RATE_CONTINUOUS	(1U<<30)	/* continuous range */
 #define SNDRV_PCM_RATE_KNOT		(1U<<31)	/* supports more non-continuous rates */
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 521ba56392a0..87eeb9b7f54a 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -2410,13 +2410,13 @@ static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
 	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
 }
 
-#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
+#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_768000 != 1 << 17
 #error "Change this table"
 #endif
 
 static const unsigned int rates[] = {
-	5512, 8000, 11025, 16000, 22050, 32000, 44100,
-	48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000, 705600, 768000
+	5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000, 64000, 88200,
+	96000, 128000, 176400, 192000, 352800, 384000, 705600, 768000,
 };
 
 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
-- 
2.43.0