Add hw_params callback to dynamically switch DAI format between I2S and PDM based on audio stream format. When DSD formats are detected, the DAI format is switched to PDM mode.
Unified · Split
| @@ -30,6 +30,53 @@ static const struct snd_soc_dapm_widget imx_rpmsg_dapm_widgets[] = { · 29 unmodified lines | ||
| 30 | 30 | SND_SOC_DAPM_MIC("Main MIC", NULL), |
| 31 | 31 | }; |
| 32 | 32 | |
| 33 | +static int imx_rpmsg_hw_params(struct snd_pcm_substream *substream, | |
| 34 | + struct snd_pcm_hw_params *params) | |
| 35 | +{ | |
| 36 | + struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream); | |
| 37 | + struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0); | |
| 38 | + struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0); | |
| 39 | + snd_pcm_format_t format = params_format(params); | |
| 40 | + struct device *dev = rtd->card->dev; | |
| 41 | + unsigned int fmt = rtd->dai_link->dai_fmt; | |
| 42 | + bool format_is_dsd = false; | |
| 43 | + int ret; | |
| 44 | + | |
| 45 | + switch (format) { | |
| 46 | + case SNDRV_PCM_FORMAT_DSD_U8: | |
| 47 | + case SNDRV_PCM_FORMAT_DSD_U16_LE: | |
| 48 | + case SNDRV_PCM_FORMAT_DSD_U16_BE: | |
| 49 | + case SNDRV_PCM_FORMAT_DSD_U32_LE: | |
| 50 | + case SNDRV_PCM_FORMAT_DSD_U32_BE: | |
| 51 | + format_is_dsd = true; | |
| 52 | + break; | |
| 53 | + default: | |
| 54 | + format_is_dsd = false; | |
| 55 | + break; | |
| 56 | + } | |
| 57 | + | |
| 58 | + if (format_is_dsd) | |
| 59 | + fmt = (rtd->dai_link->dai_fmt & ~SND_SOC_DAIFMT_FORMAT_MASK) | | |
| 60 | + SND_SOC_DAIFMT_PDM; | |
| 61 | + | |
| 62 | + ret = snd_soc_dai_set_fmt(cpu_dai, fmt); | |
| 63 | + if (ret && ret != -ENOTSUPP) { | |
| 64 | + dev_err(dev, "failed to set cpu dai fmt: %d\n", ret); | |
| 65 | + return ret; | |
| 66 | + } | |
| 67 | + ret = snd_soc_dai_set_fmt(codec_dai, fmt); | |
| 68 | + if (ret && ret != -ENOTSUPP) { | |
| 69 | + dev_err(dev, "failed to set codec dai fmt: %d\n", ret); | |
| 70 | + return ret; | |
| 71 | + } | |
| 72 | + | |
| 73 | + return 0; | |
| 74 | +} | |
| 75 | + | |
| 76 | +static const struct snd_soc_ops imx_rpmsg_ops = { | |
| 77 | + .hw_params = imx_rpmsg_hw_params, | |
| 78 | +}; | |
| 79 | + | |
| 33 | 80 | static int imx_rpmsg_late_probe(struct snd_soc_card *card) |
| 34 | 81 | { |
| 35 | 82 | struct imx_rpmsg *data = snd_soc_card_get_drvdata(card); |
| @@ -135,6 +182,7 @@ static int imx_rpmsg_probe(struct platform_device *pdev) · 99 unmodified lines | ||
| 135 | 182 | data->dai.dai_fmt = SND_SOC_DAIFMT_I2S | |
| 136 | 183 | SND_SOC_DAIFMT_NB_NF | |
| 137 | 184 | SND_SOC_DAIFMT_CBC_CFC; |
| 185 | + data->dai.ops = &imx_rpmsg_ops; | |
| 138 | 186 | |
| 139 | 187 | /* |
| 140 | 188 | * i.MX rpmsg sound cards work on codec slave mode. MCLK will be |