linux-kernel - [PATCH 4/4] ASoC: fsl_sai: Add sample rate constraint

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Message-ID: <20241126115440.3929061-5-chancel.liu@nxp.com>
Date: Tue, 26 Nov 2024 20:54:40 +0900
From: Chancel Liu <chancel.liu@....com>
To: shengjiu.wang@...il.com,
	Xiubo.Lee@...il.com,
	festevam@...il.com,
	nicoleotsuka@...il.com,
	lgirdwood@...il.com,
	broonie@...nel.org,
	perex@...ex.cz,
	tiwai@...e.com,
	linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org,
	linux-sound@...r.kernel.org
Cc: Chancel Liu <chancel.liu@....com>
Subject: [PATCH 4/4] ASoC: fsl_sai: Add sample rate constraint

Platforms like i.MX93/91 only have one audio PLL. Some sample rates are
not supported. If the PLL source is used for 8kHz series rates, then
11kHz series rates can't be supported. Use fsl_asoc_constrain_rates()
to constrain rates according to PLL sources.

Signed-off-by: Chancel Liu <chancel.liu@....com>
---
 sound/soc/fsl/fsl_sai.c | 7 ++++++-
 sound/soc/fsl/fsl_sai.h | 3 +++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
index 634168d2bb6e..c4eb87c5d39e 100644
--- a/sound/soc/fsl/fsl_sai.c
+++ b/sound/soc/fsl/fsl_sai.c
@@ -885,7 +885,7 @@ static int fsl_sai_startup(struct snd_pcm_substream *substream,
 					   sai->dma_params_rx.maxburst);
 
 	ret = snd_pcm_hw_constraint_list(substream->runtime, 0,
-			SNDRV_PCM_HW_PARAM_RATE, &fsl_sai_rate_constraints);
+					 SNDRV_PCM_HW_PARAM_RATE, &sai->constraint_rates);
 
 	return ret;
 }
@@ -1442,6 +1442,11 @@ static int fsl_sai_probe(struct platform_device *pdev)
 	fsl_asoc_get_pll_clocks(&pdev->dev, &sai->pll8k_clk,
 				&sai->pll11k_clk);
 
+	fsl_asoc_constrain_rates(&sai->constraint_rates,
+				 &fsl_sai_rate_constraints,
+				 sai->pll8k_clk, sai->pll11k_clk, NULL,
+				 sai->constraint_rates_list);
+
 	/* Use Multi FIFO mode depending on the support from SDMA script */
 	ret = of_property_read_u32_array(np, "dmas", dmas, 4);
 	if (!sai->soc_data->use_edma && !ret && dmas[2] == IMX_DMATYPE_MULTI_SAI)
diff --git a/sound/soc/fsl/fsl_sai.h b/sound/soc/fsl/fsl_sai.h
index 9c4d19fe22c6..0e25e2fc7ce0 100644
--- a/sound/soc/fsl/fsl_sai.h
+++ b/sound/soc/fsl/fsl_sai.h
@@ -9,6 +9,7 @@
 #include <linux/dma/imx-dma.h>
 #include <sound/dmaengine_pcm.h>
 
+#define FAL_SAI_NUM_RATES  20
 #define FSL_SAI_FORMATS (SNDRV_PCM_FMTBIT_S16_LE |\
 			 SNDRV_PCM_FMTBIT_S20_3LE |\
 			 SNDRV_PCM_FMTBIT_S24_LE |\
@@ -309,6 +310,8 @@ struct fsl_sai {
 	struct pinctrl *pinctrl;
 	struct pinctrl_state *pins_state;
 	struct sdma_peripheral_config audio_config[2];
+	struct snd_pcm_hw_constraint_list constraint_rates;
+	unsigned int constraint_rates_list[FAL_SAI_NUM_RATES];
 };
 
 #define TX 1
-- 
2.46.2