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Mon, 18 May 2026 14:21:13 +0800 (CST) X-QQ-SSF: 0000000000000000000000000000000 X-QQ-GoodBg: 0 X-BIZMAIL-ID: 11071802599520518211 EX-QQ-RecipientCnt: 11 From: Troy Mitchell Date: Mon, 18 May 2026 14:21:08 +0800 Subject: [PATCH v3 1/2] ASoC: soc-dai: add shared BCLK clock for cross-DAI rate constraints Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260518-i2s-same-blk-v3-1-2ba1c4f41db9@linux.spacemit.com> References: <20260518-i2s-same-blk-v3-0-2ba1c4f41db9@linux.spacemit.com> In-Reply-To: <20260518-i2s-same-blk-v3-0-2ba1c4f41db9@linux.spacemit.com> To: Liam Girdwood , Mark Brown , Jaroslav Kysela , Takashi Iwai , Yixun Lan Cc: linux-sound@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, spacemit@lists.linux.dev, jinmei.wei@spacemit.com, Troy Mitchell X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; 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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 --- include/sound/soc-dai.h | 7 +++++++ sound/soc/soc-dai.c | 18 ++++++++++++++++++ 2 files changed, 25 insertions(+) diff --git a/include/sound/soc-dai.h b/include/sound/soc-dai.h index 6a42812bba8c..df010a91b350 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 2f370fda1266..1719ddcefa4b 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; -- 2.54.0