linux-kernel - [PATCH v2 3/3] ASoC: mediatek: mt7986: add sample rate checker

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Date:   Tue, 24 Oct 2023 11:50:19 +0800
From:   Maso Huang <maso.huang@...iatek.com>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, <alsa-devel@...a-project.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
CC:     Maso Huang <maso.huang@...iatek.com>
Subject: [PATCH v2 3/3] ASoC: mediatek: mt7986: add sample rate checker

mt7986 only supports 8/12/16/24/32/48/96/192 kHz

Signed-off-by: Maso Huang <maso.huang@...iatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 sound/soc/mediatek/mt7986/mt7986-dai-etdm.c | 23 +++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/sound/soc/mediatek/mt7986/mt7986-dai-etdm.c b/sound/soc/mediatek/mt7986/mt7986-dai-etdm.c
index e523d33846fe..d57971413a04 100644
--- a/sound/soc/mediatek/mt7986/mt7986-dai-etdm.c
+++ b/sound/soc/mediatek/mt7986/mt7986-dai-etdm.c
@@ -237,12 +237,27 @@ static int mtk_dai_etdm_hw_params(struct snd_pcm_substream *substream,
 				  struct snd_pcm_hw_params *params,
 				  struct snd_soc_dai *dai)
 {
+	unsigned int rate = params_rate(params);
 	struct mtk_base_afe *afe = snd_soc_dai_get_drvdata(dai);
 
-	mtk_dai_etdm_config(afe, params, dai, SNDRV_PCM_STREAM_PLAYBACK);
-	mtk_dai_etdm_config(afe, params, dai, SNDRV_PCM_STREAM_CAPTURE);
-
-	return 0;
+	switch (rate) {
+	case 8000:
+	case 12000:
+	case 16000:
+	case 24000:
+	case 32000:
+	case 48000:
+	case 96000:
+	case 192000:
+		mtk_dai_etdm_config(afe, params, dai, SNDRV_PCM_STREAM_PLAYBACK);
+		mtk_dai_etdm_config(afe, params, dai, SNDRV_PCM_STREAM_CAPTURE);
+		return 0;
+	default:
+		dev_err(afe->dev,
+			"Sample rate %d invalid. Supported rates: 8/12/16/24/32/48/96/192 kHz\n",
+			rate);
+		return -EINVAL;
+	}
 }
 
 static int mtk_dai_etdm_trigger(struct snd_pcm_substream *substream, int cmd,
-- 
2.18.0