[PATCH] ASoC: mediatek: mt8195: add sof be ops to check audio active

[YC Hung <yc.hung@xxxxxxxxxxxx>]

In MT8195 SOF design, both DSP and audio driver would access audio
registers. Before DSP accesses audio registers, audio power and clock
should be enabled. DSP will hang up if DSP access audio register but
audio power and clock are disabled. Therefore, we add audio pm runtime
active checking before accessing audio registers in SOF BE's callback
hw_params function to avoid this situation.

Signed-off-by: YC Hung <yc.hung@xxxxxxxxxxxx>
---
 sound/soc/mediatek/mt8195/mt8195-mt6359.c | 30 +++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/sound/soc/mediatek/mt8195/mt8195-mt6359.c b/sound/soc/mediatek/mt8195/mt8195-mt6359.c
index 61be66f47723..4682748d82be 100644
--- a/sound/soc/mediatek/mt8195/mt8195-mt6359.c
+++ b/sound/soc/mediatek/mt8195/mt8195-mt6359.c
@@ -633,6 +633,32 @@ static const struct snd_soc_ops mt8195_rt1011_etdm_ops = {
 	.hw_params = mt8195_rt1011_etdm_hw_params,
 };
 
+static int mt8195_sof_be_hw_params(struct snd_pcm_substream *substream,
+				   struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	struct snd_soc_component *cmpnt_afe = NULL;
+	struct snd_soc_pcm_runtime *runtime;
+
+	/* find afe component */
+	for_each_card_rtds(rtd->card, runtime) {
+		cmpnt_afe = snd_soc_rtdcom_lookup(runtime, AFE_PCM_NAME);
+		if (cmpnt_afe)
+			break;
+	}
+
+	if (cmpnt_afe && !pm_runtime_active(cmpnt_afe->dev)) {
+		dev_err(rtd->dev, "afe pm runtime is not active!!\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static const struct snd_soc_ops mt8195_sof_be_ops = {
+	.hw_params = mt8195_sof_be_hw_params,
+};
+
 static int mt8195_rt1011_init(struct snd_soc_pcm_runtime *rtd)
 {
 	struct snd_soc_card *card = rtd->card;
@@ -1272,24 +1298,28 @@ static struct snd_soc_dai_link mt8195_mt6359_dai_links[] = {
 		.name = "AFE_SOF_DL2",
 		.no_pcm = 1,
 		.dpcm_playback = 1,
+		.ops = &mt8195_sof_be_ops,
 		SND_SOC_DAILINK_REG(AFE_SOF_DL2),
 	},
 	[DAI_LINK_SOF_DL3_BE] = {
 		.name = "AFE_SOF_DL3",
 		.no_pcm = 1,
 		.dpcm_playback = 1,
+		.ops = &mt8195_sof_be_ops,
 		SND_SOC_DAILINK_REG(AFE_SOF_DL3),
 	},
 	[DAI_LINK_SOF_UL4_BE] = {
 		.name = "AFE_SOF_UL4",
 		.no_pcm = 1,
 		.dpcm_capture = 1,
+		.ops = &mt8195_sof_be_ops,
 		SND_SOC_DAILINK_REG(AFE_SOF_UL4),
 	},
 	[DAI_LINK_SOF_UL5_BE] = {
 		.name = "AFE_SOF_UL5",
 		.no_pcm = 1,
 		.dpcm_capture = 1,
+		.ops = &mt8195_sof_be_ops,
 		SND_SOC_DAILINK_REG(AFE_SOF_UL5),
 	},
 };
-- 
2.18.0