diff options
| author | Troy Mitchell <troy.mitchell@linux.spacemit.com> | 2026-05-22 21:33:57 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2026-05-25 11:42:41 +0100 |
| commit | 94bdfad3a665da68731deb56b0fe80f00a3e6da8 (patch) | |
| tree | de4cb0237a4123728b596252f301d1ee0b215cce | |
| parent | e7ae89a0c97ce2b68b0983cd01eda67cf373517d (diff) | |
| download | linux-next-history-94bdfad3a665da68731deb56b0fe80f00a3e6da8.tar.gz | |
ASoC: soc-dai: add shared BCLK clock for cross-DAI rate constraints
Add a bclk field to struct snd_soc_dai and a helper function
snd_soc_dai_set_bclk_clk() that platform drivers can use to declare
which clock is their BCLK.
Also cache the bclk_ratio in snd_soc_dai_set_bclk_ratio() so that
the framework can use it later in hw_rule evaluation for TDM
configurations where BCLK = rate * slots * slot_width.
When multiple DAIs on the same card share the same physical BCLK
(detected via clk_is_match()), the ASoC core can automatically
constrain their hw_params so that the resulting BCLK rates are
compatible. This commit adds the data structure support; the actual
constraint logic follows in the next patch.
Signed-off-by: Troy Mitchell <troy.mitchell@linux.spacemit.com>
Link: https://patch.msgid.link/20260522-i2s-same-blk-v4-1-a71a86faaa20@linux.spacemit.com
Signed-off-by: Mark Brown <broonie@kernel.org>
| -rw-r--r-- | include/sound/soc-dai.h | 7 | ||||
| -rw-r--r-- | sound/soc/soc-dai.c | 18 |
2 files changed, 25 insertions, 0 deletions
diff --git a/include/sound/soc-dai.h b/include/sound/soc-dai.h index 6a42812bba8ca..df010a91b3505 100644 --- a/include/sound/soc-dai.h +++ b/include/sound/soc-dai.h @@ -17,6 +17,7 @@ struct snd_pcm_substream; struct snd_soc_dapm_widget; struct snd_compr_stream; +struct clk; /* * DAI hardware audio formats. @@ -188,6 +189,8 @@ int snd_soc_dai_set_pll(struct snd_soc_dai *dai, int snd_soc_dai_set_bclk_ratio(struct snd_soc_dai *dai, unsigned int ratio); +void snd_soc_dai_set_bclk_clk(struct snd_soc_dai *dai, struct clk *bclk); + /* Digital Audio interface formatting */ int snd_soc_dai_get_fmt_max_priority(const struct snd_soc_pcm_runtime *rtd); u64 snd_soc_dai_get_fmt(const struct snd_soc_dai *dai, int priority); @@ -473,6 +476,10 @@ struct snd_soc_dai { unsigned int symmetric_channels; unsigned int symmetric_sample_bits; + /* shared BCLK clock for cross-DAI rate constraints */ + struct clk *bclk; + unsigned int bclk_ratio; /* BCLK = rate * bclk_ratio (0 = use channels * sample_bits) */ + /* parent platform/codec */ struct snd_soc_component *component; diff --git a/sound/soc/soc-dai.c b/sound/soc/soc-dai.c index 2f370fda12665..1719ddcefa4b0 100644 --- a/sound/soc/soc-dai.c +++ b/sound/soc/soc-dai.c @@ -116,10 +116,28 @@ int snd_soc_dai_set_bclk_ratio(struct snd_soc_dai *dai, unsigned int ratio) dai->driver->ops->set_bclk_ratio) ret = dai->driver->ops->set_bclk_ratio(dai, ratio); + if (!ret) + dai->bclk_ratio = ratio; + return soc_dai_ret(dai, ret); } EXPORT_SYMBOL_GPL(snd_soc_dai_set_bclk_ratio); +/** + * snd_soc_dai_set_bclk_clk - set the BCLK clock for shared clock detection + * @dai: DAI + * @bclk: BCLK clock pointer (or NULL to clear) + * + * When multiple DAIs share the same physical BCLK (detected via + * clk_is_match()), the ASoC core will automatically constrain their + * hw_params so that the resulting BCLK rates are compatible. + */ +void snd_soc_dai_set_bclk_clk(struct snd_soc_dai *dai, struct clk *bclk) +{ + dai->bclk = bclk; +} +EXPORT_SYMBOL_GPL(snd_soc_dai_set_bclk_clk); + int snd_soc_dai_get_fmt_max_priority(const struct snd_soc_pcm_runtime *rtd) { struct snd_soc_dai *dai; |