linux-kernel - [PATCH] ASoC: mediatek: mt8173: Fix debugfs registration for components

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Date:   Thu, 11 Nov 2021 17:11:08 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     lgirdwood@...il.com
Cc:     dafna.hirschfeld@...labora.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, matthias.bgg@...il.com,
        kuninori.morimoto.gx@...esas.com,
        pierre-louis.bossart@...ux.intel.com, alsa-devel@...a-project.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Subject: [PATCH] ASoC: mediatek: mt8173: Fix debugfs registration for components

When registering the mt8173-afe-pcm driver, we are also adding two
components: one is for the PCM DAIs and one is for the HDMI DAIs, but
when debugfs is enabled, we're getting the following issue:

[   17.279176] debugfs: Directory '11220000.audio-controller' with parent 'mtk-rt5650' already present!
[   17.288345] debugfs: Directory '11220000.audio-controller' with parent 'mtk-rt5650' already present!

To overcome to that without any potentially big rewrite of this driver,
similarly to what was done in mt8195-afe-pcm, add a debugfs_prefix to
the components before actually adding them.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 sound/soc/mediatek/mt8173/mt8173-afe-pcm.c | 51 ++++++++++++++++++----
 1 file changed, 43 insertions(+), 8 deletions(-)

diff --git a/sound/soc/mediatek/mt8173/mt8173-afe-pcm.c b/sound/soc/mediatek/mt8173/mt8173-afe-pcm.c
index 6350390414d4..31494930433f 100644
--- a/sound/soc/mediatek/mt8173/mt8173-afe-pcm.c
+++ b/sound/soc/mediatek/mt8173/mt8173-afe-pcm.c
@@ -1054,6 +1054,7 @@ static int mt8173_afe_pcm_dev_probe(struct platform_device *pdev)
 	int irq_id;
 	struct mtk_base_afe *afe;
 	struct mt8173_afe_private *afe_priv;
+	struct snd_soc_component *comp_pcm, *comp_hdmi;
 
 	ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(33));
 	if (ret)
@@ -1142,23 +1143,55 @@ static int mt8173_afe_pcm_dev_probe(struct platform_device *pdev)
 	if (ret)
 		goto err_pm_disable;
 
-	ret = devm_snd_soc_register_component(&pdev->dev,
-					 &mt8173_afe_pcm_dai_component,
-					 mt8173_afe_pcm_dais,
-					 ARRAY_SIZE(mt8173_afe_pcm_dais));
+	comp_pcm = devm_kzalloc(&pdev->dev, sizeof(*comp_pcm), GFP_KERNEL);
+	if (!comp_pcm) {
+		ret = -ENOMEM;
+		goto err_pm_disable;
+	}
+
+	ret = snd_soc_component_initialize(comp_pcm,
+					   &mt8173_afe_pcm_dai_component,
+					   &pdev->dev);
 	if (ret)
 		goto err_pm_disable;
 
-	ret = devm_snd_soc_register_component(&pdev->dev,
-					 &mt8173_afe_hdmi_dai_component,
-					 mt8173_afe_hdmi_dais,
-					 ARRAY_SIZE(mt8173_afe_hdmi_dais));
+#ifdef CONFIG_DEBUG_FS
+	comp_pcm->debugfs_prefix = "pcm";
+#endif
+
+	ret = snd_soc_add_component(comp_pcm,
+				    mt8173_afe_pcm_dais,
+				    ARRAY_SIZE(mt8173_afe_pcm_dais));
+	if (ret)
+		goto err_pm_disable;
+
+	comp_hdmi = devm_kzalloc(&pdev->dev, sizeof(*comp_hdmi), GFP_KERNEL);
+	if (!comp_hdmi) {
+		ret = -ENOMEM;
+		goto err_pm_disable;
+	}
+
+	ret = snd_soc_component_initialize(comp_hdmi,
+					   &mt8173_afe_hdmi_dai_component,
+					   &pdev->dev);
 	if (ret)
 		goto err_pm_disable;
 
+#ifdef CONFIG_DEBUG_FS
+	comp_hdmi->debugfs_prefix = "hdmi";
+#endif
+
+	ret = snd_soc_add_component(comp_hdmi,
+				    mt8173_afe_hdmi_dais,
+				    ARRAY_SIZE(mt8173_afe_hdmi_dais));
+	if (ret)
+		goto err_cleanup_components;
+
 	dev_info(&pdev->dev, "MT8173 AFE driver initialized.\n");
 	return 0;
 
+err_cleanup_components:
+	snd_soc_unregister_component(&pdev->dev);
 err_pm_disable:
 	pm_runtime_disable(&pdev->dev);
 	return ret;
@@ -1166,6 +1199,8 @@ static int mt8173_afe_pcm_dev_probe(struct platform_device *pdev)
 
 static int mt8173_afe_pcm_dev_remove(struct platform_device *pdev)
 {
+	snd_soc_unregister_component(&pdev->dev);
+
 	pm_runtime_disable(&pdev->dev);
 	if (!pm_runtime_status_suspended(&pdev->dev))
 		mt8173_afe_runtime_suspend(&pdev->dev);
-- 
2.33.1