linux-kernel - [PATCH v3 07/10] drm/display: hdmi_state_helper: reject Audio IF updates if it's not supported

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Message-Id: <20251224-limit-infoframes-2-v3-7-7fd3cacfefed@oss.qualcomm.com>
Date: Wed, 24 Dec 2025 03:02:56 +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 07/10] drm/display: hdmi_state_helper: reject Audio IF
 updates if it's not supported

Updating the InfoFrame if it can not be sent over the wire makes no
sense. Change drm_atomic_helper_connector_hdmi_update_audio_infoframe()
and drm_atomic_helper_connector_hdmi_clear_audio_infoframe() to return
an error if Audio InfoFrame callbacks are not implemented.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
---
 drivers/gpu/drm/display/drm_hdmi_state_helper.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
index 5a3817271d91..e8556bf9e1da 100644
--- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c
+++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
@@ -1061,7 +1061,7 @@ drm_atomic_helper_connector_hdmi_update_audio_infoframe(struct drm_connector *co
 	if (!info->is_hdmi)
 		return 0;
 
-	if (!funcs) {
+	if (!funcs || !funcs->audio.write_infoframe) {
 		drm_dbg_kms(connector->dev, "Function not implemented, bailing.\n");
 		return -EINVAL;
 	}
@@ -1102,7 +1102,7 @@ drm_atomic_helper_connector_hdmi_clear_audio_infoframe(struct drm_connector *con
 	if (!info->is_hdmi)
 		return 0;
 
-	if (!funcs) {
+	if (!funcs || !funcs->audio.write_infoframe) {
 		drm_dbg_kms(connector->dev, "Function not implemented, bailing.\n");
 		return -EINVAL;
 	}

-- 
2.47.3