Re: [PATCH 01/13] ALSA: pcm: add more sample rate definitions

[Takashi Iwai <tiwai@suse.de>]

On Wed, 11 Sep 2024 12:33:01 +0200,
Péter Ujfalusi wrote:
> 
> On 11/09/2024 12:21, Takashi Iwai wrote:
> >> Wondering if this is backwards compatible with the alsa-lib definitions,
> >> specifically the topology parts which did unfortunately have a list of
> >> rates that will map to a different index now:
> >>
> >>
> >> typedef enum _snd_pcm_rates {
> >> 	SND_PCM_RATE_UNKNOWN = -1,
> >> 	SND_PCM_RATE_5512 = 0,
> >> 	SND_PCM_RATE_8000,
> >> 	SND_PCM_RATE_11025,
> >> 	SND_PCM_RATE_16000,
> >> 	SND_PCM_RATE_22050,
> >> 	SND_PCM_RATE_32000,
> >> 	SND_PCM_RATE_44100,
> >> 	SND_PCM_RATE_48000,
> >> 	SND_PCM_RATE_64000,
> >> 	SND_PCM_RATE_88200,
> >> 	SND_PCM_RATE_96000,
> >> 	SND_PCM_RATE_176400,
> >> 	SND_PCM_RATE_192000,
> >> 	SND_PCM_RATE_CONTINUOUS = 30,
> >> 	SND_PCM_RATE_KNOT = 31,
> >> 	SND_PCM_RATE_LAST = SND_PCM_RATE_KNOT,
> >> } snd_pcm_rates_t;
> > 
> > As far as I understand correctly, those rate bits used for topology
> > are independent from the bits used for PCM core, although it used to
> > be the same.  Maybe better to rename (such as SND_TPLG_RATE_*) so that
> > it's clearer only for topology stuff.
> 
> Even if we rename these in alsa-lib we will need translation from
> SND_TPLG_RATE_ to SND_PCM_RATE_ in kernel likely?
> 
> The topology files are out there and this is an ABI...
> 
> > But it'd be better if anyone can double-check.
> 
> Since the kernel just copies the rates bitfield, any rate above 11025
> will be misaligned and result broken setup.

Yep, I noticed it now, too.

Below is the fix patch, totally untested.
It'd be appreciated if anyone can test it quickly.


thanks,

Takashi

-- 8< --
From: Takashi Iwai <tiwai@suse.de>
Subject: [PATCH] ALSA: pcm: Fix breakage of PCM rates used for topology

It turned out that the topology ABI takes the standard PCM rate bits
as is, and it means that the recent change of the PCM rate bits would
lead to the inconsistent rate values used for topology.

This patch reverts the original PCM rate bit definitions while adding
the new rates to the extended bits instead.  This needed the change of
snd_pcm_known_rates, too.  And this also required to fix the handling
in snd_pcm_hw_limit_rates() that blindly assumed that the list is
sorted while it became unsorted now.

Fixes: 090624b7dc83 ("ALSA: pcm: add more sample rate definitions")
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 include/sound/pcm.h     | 35 ++++++++++++++++++-----------------
 sound/core/pcm_misc.c   | 18 ++++++++++--------
 sound/core/pcm_native.c | 10 +++++++---
 3 files changed, 35 insertions(+), 28 deletions(-)

diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index c993350975a9..824216799070 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -109,23 +109,24 @@ struct snd_pcm_ops {
 #define SNDRV_PCM_RATE_5512		(1U<<0)		/* 5512Hz */
 #define SNDRV_PCM_RATE_8000		(1U<<1)		/* 8000Hz */
 #define SNDRV_PCM_RATE_11025		(1U<<2)		/* 11025Hz */
-#define SNDRV_PCM_RATE_12000		(1U<<3)		/* 12000Hz */
-#define SNDRV_PCM_RATE_16000		(1U<<4)		/* 16000Hz */
-#define SNDRV_PCM_RATE_22050		(1U<<5)		/* 22050Hz */
-#define SNDRV_PCM_RATE_24000		(1U<<6)		/* 24000Hz */
-#define SNDRV_PCM_RATE_32000		(1U<<7)		/* 32000Hz */
-#define SNDRV_PCM_RATE_44100		(1U<<8)		/* 44100Hz */
-#define SNDRV_PCM_RATE_48000		(1U<<9)		/* 48000Hz */
-#define SNDRV_PCM_RATE_64000		(1U<<10)	/* 64000Hz */
-#define SNDRV_PCM_RATE_88200		(1U<<11)	/* 88200Hz */
-#define SNDRV_PCM_RATE_96000		(1U<<12)	/* 96000Hz */
-#define SNDRV_PCM_RATE_128000		(1U<<13)	/* 128000Hz */
-#define SNDRV_PCM_RATE_176400		(1U<<14)	/* 176400Hz */
-#define SNDRV_PCM_RATE_192000		(1U<<15)	/* 192000Hz */
-#define SNDRV_PCM_RATE_352800		(1U<<16)	/* 352800Hz */
-#define SNDRV_PCM_RATE_384000		(1U<<17)	/* 384000Hz */
-#define SNDRV_PCM_RATE_705600		(1U<<18)	/* 705600Hz */
-#define SNDRV_PCM_RATE_768000		(1U<<19)	/* 768000Hz */
+#define SNDRV_PCM_RATE_16000		(1U<<3)		/* 16000Hz */
+#define SNDRV_PCM_RATE_22050		(1U<<4)		/* 22050Hz */
+#define SNDRV_PCM_RATE_32000		(1U<<5)		/* 32000Hz */
+#define SNDRV_PCM_RATE_44100		(1U<<6)		/* 44100Hz */
+#define SNDRV_PCM_RATE_48000		(1U<<7)		/* 48000Hz */
+#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 */
+/* extended rates */
+#define SNDRV_PCM_RATE_12000		(1U<<17)	/* 12000Hz */
+#define SNDRV_PCM_RATE_24000		(1U<<18)	/* 24000Hz */
+#define SNDRV_PCM_RATE_128000		(1U<<19)	/* 128000Hz */
 
 #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_misc.c b/sound/core/pcm_misc.c
index 5588b6a1ee8b..4f556211bb56 100644
--- a/sound/core/pcm_misc.c
+++ b/sound/core/pcm_misc.c
@@ -494,18 +494,20 @@ EXPORT_SYMBOL(snd_pcm_format_set_silence);
 int snd_pcm_hw_limit_rates(struct snd_pcm_hardware *hw)
 {
 	int i;
+	unsigned int rmin, rmax;
+
+	rmin = UINT_MAX;
+	rmax = 0;
 	for (i = 0; i < (int)snd_pcm_known_rates.count; i++) {
 		if (hw->rates & (1 << i)) {
-			hw->rate_min = snd_pcm_known_rates.list[i];
-			break;
-		}
-	}
-	for (i = (int)snd_pcm_known_rates.count - 1; i >= 0; i--) {
-		if (hw->rates & (1 << i)) {
-			hw->rate_max = snd_pcm_known_rates.list[i];
-			break;
+			rmin = min(rmin, snd_pcm_known_rates.list[i]);
+			rmax = max(rmax, snd_pcm_known_rates.list[i]);
 		}
 	}
+	if (rmin > rmax)
+		return -EINVAL;
+	hw->rate_min = rmin;
+	hw->rate_max = rmax;
 	return 0;
 }
 EXPORT_SYMBOL(snd_pcm_hw_limit_rates);
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 7461a727615c..5e1e6006707b 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -2418,13 +2418,17 @@ 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_768000 != 1 << 19
+#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 ||\
+	SNDRV_PCM_RATE_128000 != 1 << 19
 #error "Change this table"
 #endif
 
+/* NOTE: the list is unsorted! */
 static const unsigned int rates[] = {
-	5512, 8000, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000, 64000,
-	88200, 96000, 128000, 176400, 192000, 352800, 384000, 705600, 768000,
+	5512, 8000, 11025, 16000, 22050, 32000, 44100,
+	48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000, 705600, 768000,
+	/* extended */
+	12000, 24000, 128000
 };
 
 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
-- 
2.43.0