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Message-ID: <87ldzy2wgc.wl-tiwai@suse.de>
Date: Wed, 11 Sep 2024 14:42:27 +0200
From: Takashi Iwai <tiwai@...e.de>
To: Jaroslav Kysela <perex@...ex.cz>
Cc: Péter Ujfalusi <peter.ujfalusi@...ux.intel.com>,
Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>, Jerome Brunet
<jbrunet@...libre.com>, Takashi Iwai <tiwai@...e.com>, David Rhodes
<david.rhodes@...rus.com>, Richard Fitzgerald <rf@...nsource.cirrus.com>,
Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
Cezary Rojewski <cezary.rojewski@...el.com>, Liam Girdwood
<liam.r.girdwood@...ux.intel.com>, Bard Liao
<yung-chuan.liao@...ux.intel.com>, Ranjani Sridharan
<ranjani.sridharan@...ux.intel.com>, Kai Vehmanen
<kai.vehmanen@...ux.intel.com>, Srinivas Kandagatla
<srinivas.kandagatla@...aro.org>, Chen-Yu Tsai <wens@...e.org>, Jernej
Skrabec <jernej.skrabec@...il.com>, Samuel Holland <samuel@...lland.org>,
linux-sound@...r.kernel.org, linux-kernel@...r.kernel.org,
patches@...nsource.cirrus.com, alsa-devel@...a-project.org,
linux-arm-msm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH 01/13] ALSA: pcm: add more sample rate definitions
On Wed, 11 Sep 2024 12:58:53 +0200,
Jaroslav Kysela wrote:
>
> On 11. 09. 24 12:51, Takashi Iwai wrote:
> > 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@...e.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@...e.de>
>
> This looks fine. But the topology rate bits should not depend on those
> bits. It's a bit pitty that the standard PCM ABI does not use those
> bits for user space and we are doing this change just for topology
> ABI.
Yeah, and theoretically it's possible to fix in topology side, but
it'll be more cumbersome.
Although it's not really a part of PCM ABI, I believe we should move
the PCM rate bit definitions to uapi, for showing that it's set in
stone. Something like below.
Takashi
-- 8< --
From: Takashi Iwai <tiwai@...e.de>
Subject: [PATCH] ALSA: pcm: Move standard rate bit definitions into uapi
Since the standard PCM rate bits are used for the topology ABI, it's a
part of public ABI that must not be changed. Move the definitions
into uapi to indicate it more clearly.
Signed-off-by: Takashi Iwai <tiwai@...e.de>
---
include/sound/pcm.h | 26 --------------------------
include/uapi/sound/asound.h | 26 ++++++++++++++++++++++++++
2 files changed, 26 insertions(+), 26 deletions(-)
diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index 824216799070..f28f6d6ac996 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -105,32 +105,6 @@ struct snd_pcm_ops {
#define SNDRV_PCM_POS_XRUN ((snd_pcm_uframes_t)-1)
-/* If you change this don't forget to change rates[] table in pcm_native.c */
-#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_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 */
-
#define SNDRV_PCM_RATE_8000_44100 (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h
index 4cd513215bcd..715ceb3eac7c 100644
--- a/include/uapi/sound/asound.h
+++ b/include/uapi/sound/asound.h
@@ -272,6 +272,32 @@ typedef int __bitwise snd_pcm_subformat_t;
#define SNDRV_PCM_SUBFORMAT_MSBITS_24 ((__force snd_pcm_subformat_t) 3)
#define SNDRV_PCM_SUBFORMAT_LAST SNDRV_PCM_SUBFORMAT_MSBITS_24
+/* Standard rate bits */
+#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_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 */
+
#define SNDRV_PCM_INFO_MMAP 0x00000001 /* hardware supports mmap */
#define SNDRV_PCM_INFO_MMAP_VALID 0x00000002 /* period data are valid during transfer */
#define SNDRV_PCM_INFO_DOUBLE 0x00000004 /* Double buffering needed for PCM start/stop */
--
2.43.0
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