ASoC: fsl_micfil: Add sample rate constraint

On some platforms, for example i.MX93, there is only one
audio PLL source, so some sample rate can't be supported.
If the PLL source is used for 8kHz series rates, then 11kHz
series rates can't be supported.

So add constraints according to the frequency of available
clock sources, then alsa-lib will help to convert the
unsupported rate for the driver.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Link: https://patch.msgid.link/1728884313-6778-1-git-send-email-shengjiu.wang@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/fsl/fsl_micfil.c b/sound/soc/fsl/fsl_micfil.c
index 84638c1a2863ab9345d3a069fa49b17bc2bcd5af..0c71a73476dfa65cf3c94bf7846b34e383819423 100644 (file)
--- a/sound/soc/fsl/fsl_micfil.c
+++ b/sound/soc/fsl/fsl_micfil.c
@@ -28,6 +28,13 @@
 
 #define MICFIL_OSR_DEFAULT     16
 
+#define MICFIL_NUM_RATES       7
+#define MICFIL_CLK_SRC_NUM     3
+/* clock source ids */
+#define MICFIL_AUDIO_PLL1      0
+#define MICFIL_AUDIO_PLL2      1
+#define MICFIL_CLK_EXT3                2
+
 enum quality {
        QUALITY_HIGH,
        QUALITY_MEDIUM,
@@ -45,9 +52,12 @@ struct fsl_micfil {
        struct clk *mclk;
        struct clk *pll8k_clk;
        struct clk *pll11k_clk;
+       struct clk *clk_src[MICFIL_CLK_SRC_NUM];
        struct snd_dmaengine_dai_dma_data dma_params_rx;
        struct sdma_peripheral_config sdmacfg;
        struct snd_soc_card *card;
+       struct snd_pcm_hw_constraint_list constraint_rates;
+       unsigned int constraint_rates_list[MICFIL_NUM_RATES];
        unsigned int dataline;
        char name[32];
        int irq[MICFIL_IRQ_LINES];
@@ -475,12 +485,34 @@ static int fsl_micfil_startup(struct snd_pcm_substream *substream,
                              struct snd_soc_dai *dai)
 {
        struct fsl_micfil *micfil = snd_soc_dai_get_drvdata(dai);
+       unsigned int rates[MICFIL_NUM_RATES] = {8000, 11025, 16000, 22050, 32000, 44100, 48000};
+       int i, j, k = 0;
+       u64 clk_rate;
 
        if (!micfil) {
                dev_err(dai->dev, "micfil dai priv_data not set\n");
                return -EINVAL;
        }
 
+       micfil->constraint_rates.list = micfil->constraint_rates_list;
+       micfil->constraint_rates.count = 0;
+
+       for (j = 0; j < MICFIL_NUM_RATES; j++) {
+               for (i = 0; i < MICFIL_CLK_SRC_NUM; i++) {
+                       clk_rate = clk_get_rate(micfil->clk_src[i]);
+                       if (clk_rate != 0 && do_div(clk_rate, rates[j]) == 0) {
+                               micfil->constraint_rates_list[k++] = rates[j];
+                               micfil->constraint_rates.count++;
+                               break;
+                       }
+               }
+       }
+
+       if (micfil->constraint_rates.count > 0)
+               snd_pcm_hw_constraint_list(substream->runtime, 0,
+                                          SNDRV_PCM_HW_PARAM_RATE,
+                                          &micfil->constraint_rates);
+
        return 0;
 }
 
@@ -1175,6 +1207,12 @@ static int fsl_micfil_probe(struct platform_device *pdev)
        fsl_asoc_get_pll_clocks(&pdev->dev, &micfil->pll8k_clk,
                                &micfil->pll11k_clk);
 
+       micfil->clk_src[MICFIL_AUDIO_PLL1] = micfil->pll8k_clk;
+       micfil->clk_src[MICFIL_AUDIO_PLL2] = micfil->pll11k_clk;
+       micfil->clk_src[MICFIL_CLK_EXT3] = devm_clk_get(&pdev->dev, "clkext3");
+       if (IS_ERR(micfil->clk_src[MICFIL_CLK_EXT3]))
+               micfil->clk_src[MICFIL_CLK_EXT3] = NULL;
+
        /* init regmap */
        regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
        if (IS_ERR(regs))