[PATCH] ASoC: fsl-asoc-card: add sysclk_ratio for calculate sysclk frequency

[PATCH] ASoC: fsl-asoc-card: add sysclk_ratio for calculate sysclk frequency

[Shengjiu Wang]

The sysclk frequency can be calculated from sample rate multiply ratio.
When sysclk_freq is not configured, but sysclk_ratio is configured, then
calculate sysclk frequency according to sysclk_ratio.

Apply this change for wm8524 codec.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
---
 sound/soc/fsl/fsl-asoc-card.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/sound/soc/fsl/fsl-asoc-card.c b/sound/soc/fsl/fsl-asoc-card.c
index ab583b432c60..71113886e494 100644
--- a/sound/soc/fsl/fsl-asoc-card.c
+++ b/sound/soc/fsl/fsl-asoc-card.c
@@ -63,6 +63,7 @@ struct codec_priv {
  * @sysclk_freq: SYSCLK rates for set_sysclk()
  * @sysclk_dir: SYSCLK directions for set_sysclk()
  * @sysclk_id: SYSCLK ids for set_sysclk()
+ * @sysclk_ratio: SYSCLK ratio on sample rate
  * @slot_width: Slot width of each frame
  * @slot_num: Number of slots of each frame
  *
@@ -72,6 +73,7 @@ struct cpu_priv {
 	unsigned long sysclk_freq[2];
 	u32 sysclk_dir[2];
 	u32 sysclk_id[2];
+	u32 sysclk_ratio[2];
 	u32 slot_width;
 	u32 slot_num;
 };
@@ -176,7 +178,7 @@ static int fsl_asoc_card_hw_params(struct snd_pcm_substream *substream,
 	struct snd_soc_dai *codec_dai;
 	struct cpu_priv *cpu_priv = &priv->cpu_priv;
 	struct device *dev = rtd->card->dev;
-	unsigned int pll_out;
+	unsigned int pll_out, sysclk_freq;
 	int codec_idx;
 	int ret;
 
@@ -187,9 +189,14 @@ static int fsl_asoc_card_hw_params(struct snd_pcm_substream *substream,
 	if (fsl_asoc_card_is_ac97(priv))
 		return 0;
 
+	if (!cpu_priv->sysclk_freq[tx] && cpu_priv->sysclk_ratio[tx])
+		sysclk_freq = priv->sample_rate * cpu_priv->sysclk_ratio[tx];
+	else
+		sysclk_freq = cpu_priv->sysclk_freq[tx];
+
 	/* Specific configurations of DAIs starts from here */
 	ret = snd_soc_dai_set_sysclk(snd_soc_rtd_to_cpu(rtd, 0), cpu_priv->sysclk_id[tx],
-				     cpu_priv->sysclk_freq[tx],
+				     sysclk_freq,
 				     cpu_priv->sysclk_dir[tx]);
 	if (ret && ret != -ENOTSUPP) {
 		dev_err(dev, "failed to set sysclk for cpu dai\n");
@@ -799,6 +806,8 @@ static int fsl_asoc_card_probe(struct platform_device *pdev)
 		priv->cpu_priv.slot_width = 32;
 		priv->card.dapm_routes = audio_map_tx;
 		priv->card.num_dapm_routes = ARRAY_SIZE(audio_map_tx);
+		priv->cpu_priv.sysclk_dir[TX] = SND_SOC_CLOCK_OUT;
+		priv->cpu_priv.sysclk_ratio[TX] = 256;
 	} else if (of_device_is_compatible(np, "fsl,imx-audio-si476x")) {
 		codec_dai_name[0] = "si476x-codec";
 		priv->dai_fmt |= SND_SOC_DAIFMT_CBC_CFC;
-- 
2.34.1

Re: [PATCH] ASoC: fsl-asoc-card: add sysclk_ratio for calculate sysclk frequency

[Mark Brown]

On Tue, 08 Jul 2025 16:53:17 +0800, Shengjiu Wang wrote:
> The sysclk frequency can be calculated from sample rate multiply ratio.
> When sysclk_freq is not configured, but sysclk_ratio is configured, then
> calculate sysclk frequency according to sysclk_ratio.
> 
> Apply this change for wm8524 codec.
> 
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next

Thanks!

[1/1] ASoC: fsl-asoc-card: add sysclk_ratio for calculate sysclk frequency
      commit: af241e3fa4d823f8af899c92fd50d020816a1860

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark