linux-kernel - [PATCH 5/9] drm/bridge: synopsys/dw-hdmi-qp: handle unsupported InfoFrames

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Message-Id: <20250927-limit-infoframes-2-v1-5-697511bd050b@oss.qualcomm.com>
Date: Sat, 27 Sep 2025 04:04:34 +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 5/9] drm/bridge: synopsys/dw-hdmi-qp: 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/bridge/synopsys/dw-hdmi-qp.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c
index 39332c57f2c54296f39e27612544f4fbf923863f..9a77e880b7f58403691338ee8c22d24af570acbf 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c
@@ -935,7 +935,7 @@ static int dw_hdmi_qp_bridge_clear_infoframe(struct drm_bridge *bridge,
 			       PKTSCHED_PKT_EN);
 		break;
 	default:
-		dev_dbg(hdmi->dev, "Unsupported infoframe type %x\n", type);
+		return -EOPNOTSUPP;
 	}
 
 	return 0;
@@ -960,12 +960,26 @@ static int dw_hdmi_qp_bridge_write_infoframe(struct drm_bridge *bridge,
 		return dw_hdmi_qp_config_audio_infoframe(hdmi, buffer, len);
 
 	default:
-		dev_dbg(hdmi->dev, "Unsupported infoframe type %x\n", type);
-		return 0;
+		return -EOPNOTSUPP;
 	}
 }
 
+static int dw_hdmi_qp_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;
+
+	return 0;
+}
+
 static const struct drm_bridge_funcs dw_hdmi_qp_bridge_funcs = {
+	.atomic_check = dw_hdmi_qp_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