linux-kernel - [PATCH 7/9] drm/rockchip: rk3066_hdmi: handle unsupported InfoFrames

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Message-Id: <20250927-limit-infoframes-2-v1-7-697511bd050b@oss.qualcomm.com>
Date: Sat, 27 Sep 2025 04:04:36 +0300
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>,
        Liu Ying <victor.liu@....com>, 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>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.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>, Chen-Yu Tsai <wens@...e.org>,
        Samuel Holland <samuel@...lland.org>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-sunxi@...ts.linux.dev
Subject: [PATCH 7/9] drm/rockchip: rk3066_hdmi: handle unsupported
 InfoFrames

Make hdmi_write_hdmi_infoframe() and hdmi_clear_infoframe() callbacks
return -EOPNOTSUPP for unsupported InfoFrames and make sure that
atomic_check() callback doesn't allow unsupported InfoFrames to be
enabled.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
---
 drivers/gpu/drm/rockchip/rk3066_hdmi.c | 38 +++++++++++++++++++++++++++-------
 1 file changed, 30 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/rk3066_hdmi.c b/drivers/gpu/drm/rockchip/rk3066_hdmi.c
index ae4a5ac2299a93a49f87df7604752f6b651c839c..cbae27e2443798d62bd83acc8b979cfc34df3544 100644
--- a/drivers/gpu/drm/rockchip/rk3066_hdmi.c
+++ b/drivers/gpu/drm/rockchip/rk3066_hdmi.c
@@ -162,10 +162,8 @@ static int rk3066_hdmi_bridge_clear_infoframe(struct drm_bridge *bridge,
 {
 	struct rk3066_hdmi *hdmi = bridge_to_rk3066_hdmi(bridge);
 
-	if (type != HDMI_INFOFRAME_TYPE_AVI) {
-		drm_err(bridge->dev, "Unsupported infoframe type: %u\n", type);
-		return 0;
-	}
+	if (type != HDMI_INFOFRAME_TYPE_AVI)
+		return -EOPNOTSUPP;
 
 	hdmi_writeb(hdmi, HDMI_CP_BUF_INDEX, HDMI_INFOFRAME_AVI);
 
@@ -180,10 +178,8 @@ rk3066_hdmi_bridge_write_infoframe(struct drm_bridge *bridge,
 	struct rk3066_hdmi *hdmi = bridge_to_rk3066_hdmi(bridge);
 	ssize_t i;
 
-	if (type != HDMI_INFOFRAME_TYPE_AVI) {
-		drm_err(bridge->dev, "Unsupported infoframe type: %u\n", type);
-		return 0;
-	}
+	if (type != HDMI_INFOFRAME_TYPE_AVI)
+		return -EOPNOTSUPP;
 
 	rk3066_hdmi_bridge_clear_infoframe(bridge, type);
 
@@ -193,6 +189,31 @@ rk3066_hdmi_bridge_write_infoframe(struct drm_bridge *bridge,
 	return 0;
 }
 
+static int
+rk3066_hdmi_bridge_atomic_check(struct drm_bridge *bridge,
+				struct drm_bridge_state *bridge_state,
+				struct drm_crtc_state *crtc_state,
+				struct drm_connector_state *conn_state)
+{
+	/* not supported by the driver */
+	conn_state->hdmi.infoframes.spd.set = false;
+
+	/* FIXME: not supported by the driver */
+	conn_state->hdmi.infoframes.hdmi.set = false;
+
+	/* should not happen, HDR support not enabled */
+	if (drm_WARN_ON_ONCE(bridge->encoder->dev,
+			     conn_state->connector->hdmi.infoframes.audio.set))
+		return -EOPNOTSUPP;
+
+	/* should not happen, audio support not enabled */
+	if (drm_WARN_ON_ONCE(bridge->encoder->dev,
+			     conn_state->hdmi.infoframes.hdr_drm.set))
+		return -EOPNOTSUPP;
+
+	return 0;
+}
+
 static int rk3066_hdmi_config_video_timing(struct rk3066_hdmi *hdmi,
 					   struct drm_display_mode *mode)
 {
@@ -485,6 +506,7 @@ rk3066_hdmi_bridge_mode_valid(struct drm_bridge *bridge,
 }
 
 static const struct drm_bridge_funcs rk3066_hdmi_bridge_funcs = {
+	.atomic_check = rk3066_hdmi_bridge_atomic_check,
 	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
 	.atomic_reset = drm_atomic_helper_bridge_reset,

-- 
2.47.3