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Message-ID: <1jy13yqrb8.fsf@starbuckisacylon.baylibre.com>
Date: Wed, 11 Sep 2024 14:59:39 +0200
From: Jerome Brunet <jbrunet@...libre.com>
To: Takashi Iwai <tiwai@...e.de>
Cc: Jaroslav Kysela <perex@...ex.cz>, Péter Ujfalusi
<peter.ujfalusi@...ux.intel.com>, Pierre-Louis Bossart
<pierre-louis.bossart@...ux.intel.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 at 14:42, Takashi Iwai <tiwai@...e.de> wrote:
> 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 */
It is cosmetic but I wonder, does the extended really start here ?
>From the table Pierre-Louis sent, I suppose that all the recently added rates could
been seen as extended too (352.8 to 768). Those did not mess with the
order though
> -#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 */
--
Jerome
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