From: "Ivan T. Ivanov" <iivanov@suse.de>
Date: Fri, 23 Jul 2021 09:24:14 +0200
Subject: drm/vc4: hdmi: Add debugfs prefix
Patch-mainline: Never, This is workaround patch for SLE15-SP4
References: bsc#1199163

Without prefix debugfs can't properly create component
debug information tree when driver register more than
one component per device, in this case two. Fix this.

debugfs: Directory 'fef00700.hdmi' with parent 'vc4-hdmi-0' already present!

Signed-off-by: Ivan T. Ivanov <iivanov@suse.de>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)

--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -1549,6 +1549,9 @@ static int vc4_hdmi_audio_init(struct vc
 	struct snd_soc_dai_link *dai_link = &vc4_hdmi->audio.link;
 	struct snd_soc_card *card = &vc4_hdmi->audio.card;
 	struct device *dev = &vc4_hdmi->pdev->dev;
+#ifdef CONFIG_DEBUG_FS
+	struct snd_soc_component *comp;
+#endif
 	const __be32 *addr;
 	int index, len;
 	int ret;
@@ -1603,6 +1606,16 @@ static int vc4_hdmi_audio_init(struct vc
 		return ret;
 	}
 
+#ifdef CONFIG_DEBUG_FS
+	comp = snd_soc_lookup_component(dev, vc4_hdmi_audio_cpu_dai_comp.name);
+	if (comp)
+		comp->debugfs_prefix = "cpu";
+
+	comp = snd_soc_lookup_component(dev, vc4_hdmi_audio_component_drv.name);
+	if (comp)
+		comp->debugfs_prefix = "codec";
+#endif
+
 	dai_link->cpus		= &vc4_hdmi->audio.cpu;
 	dai_link->codecs	= &vc4_hdmi->audio.codec;
 	dai_link->platforms	= &vc4_hdmi->audio.platform;