linux-kernel - [PATCH v3 09/11] drm/connector: verify that HDMI connectors support necessary InfoFrames

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250830-drm-limit-infoframes-v3-9-32fcbec4634e@oss.qualcomm.com>
Date: Sat, 30 Aug 2025 03:23:05 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: 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>,
        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>,
        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>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Maíra Canal <mcanal@...lia.com>,
        Raspberry Pi Kernel Maintenance <kernel-list@...pberrypi.com>,
        Liu Ying <victor.liu@....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>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org
Subject: [PATCH v3 09/11] drm/connector: verify that HDMI connectors
 support necessary InfoFrames

Check that connector initialized by drmm_connector_hdmi_init() supports
AVI InfoFrames and warn if it doesn't support Vendor-Specific
InfofRames (HDMI InfoFrames are more or less required).

Suggested-by: Maxime Ripard <mripard@...nel.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
---
 drivers/gpu/drm/drm_connector.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index f031e8f8df57da15bb0f8fe21fd62f02a1576ebe..12ee06bad364183ad56a20b2bf9860491913a295 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -582,6 +582,7 @@ int drmm_connector_hdmi_init(struct drm_device *dev,
 			     unsigned long autogenerated_infoframes,
 			     unsigned int max_bpc)
 {
+	unsigned long supported_infoframes;
 	int ret;
 
 	if (!vendor || !product)
@@ -604,6 +605,15 @@ int drmm_connector_hdmi_init(struct drm_device *dev,
 	if (!(max_bpc == 8 || max_bpc == 10 || max_bpc == 12))
 		return -EINVAL;
 
+	supported_infoframes = software_infoframes | autogenerated_infoframes;
+
+	/* AVI is required */
+	if (!(supported_infoframes & DRM_CONNECTOR_INFOFRAME_AVI))
+		return -EINVAL;
+
+	if (!(supported_infoframes & DRM_CONNECTOR_INFOFRAME_VENDOR))
+		drm_info(dev, "HDMI conneector with no support for Vendor-Specific InfoFrame\n");
+
 	ret = drmm_connector_init(dev, connector, funcs, connector_type, ddc);
 	if (ret)
 		return ret;

-- 
2.47.2