linux-kernel - [PATCH v3 10/10] drm/debug: don't register files for unsupported HDMI InfoFrames

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Message-Id: <20251224-limit-infoframes-2-v3-10-7fd3cacfefed@oss.qualcomm.com>
Date: Wed, 24 Dec 2025 03:02:59 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Maíra Canal <mcanal@...lia.com>,
        Raspberry Pi Kernel Maintenance <kernel-list@...pberrypi.com>,
        Chen-Yu Tsai <wens@...nel.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>, Liu Ying <victor.liu@....com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
        Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jesszhan0024@...il.com>, Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Sandy Huang <hjc@...k-chips.com>,
        Heiko Stübner <heiko@...ech.de>,
        Andy Yan <andy.yan@...k-chips.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-mediatek@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, linux-rockchip@...ts.infradead.org
Subject: [PATCH v3 10/10] drm/debug: don't register files for unsupported
 HDMI InfoFrames

Having debugfs files for the InfoFrames that are not supported by the
driver is confusing, stop registering those in the debugfs.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
---
 drivers/gpu/drm/drm_debugfs.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c
index 365cf337529f..ae1c6126c2c5 100644
--- a/drivers/gpu/drm/drm_debugfs.c
+++ b/drivers/gpu/drm/drm_debugfs.c
@@ -672,6 +672,10 @@ static int create_hdmi_audio_infoframe_file(struct drm_connector *connector,
 {
 	struct dentry *file;
 
+	if (!connector->hdmi.funcs ||
+	    !connector->hdmi.funcs->audio.write_infoframe)
+		return 0;
+
 	file = debugfs_create_file("audio", 0400, parent, connector, &audio_infoframe_fops);
 	if (IS_ERR(file))
 		return PTR_ERR(file);
@@ -726,6 +730,9 @@ static int create_hdmi_## _f ## _infoframe_file(struct drm_connector *connector,
 { \
 	struct dentry *file; \
 	\
+	if (!connector->hdmi.funcs || \
+	    !connector->hdmi.funcs->_f.write_infoframe) \
+		return 0; \
 	file = debugfs_create_file(#_f, 0400, parent, connector, &_f ## _infoframe_fops); \
 	if (IS_ERR(file)) \
 		return PTR_ERR(file); \

-- 
2.47.3