openwrt/target/linux/mediatek/patches-6.1/860-v6.7-09-ASoC-mediatek-mt7986-add-sample-rate-checker.patch

From 4e229f4264f4be7a6a554487714c0913ef59cf7f Mon Sep 17 00:00:00 2001
From: Maso Huang <maso.huang@mediatek.com>
Date: Tue, 24 Oct 2023 11:50:19 +0800
Subject: [PATCH 9/9] 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@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20231024035019.11732-4-maso.huang@mediatek.com
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 sound/soc/mediatek/mt7986/mt7986-dai-etdm.c | 23 +++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

--- 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
 				  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,