linux-kernel - [PATCH v5 16/17] drm/connector: Register color format property on HDMI connectors

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Message-Id: <20251128-color-format-v5-16-63e82f1db1e1@collabora.com>
Date: Fri, 28 Nov 2025 22:05:52 +0100
From: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
To: Harry Wentland <harry.wentland@....com>, Leo Li <sunpeng.li@....com>, 
 Rodrigo Siqueira <siqueira@...lia.com>, 
 Alex Deucher <alexander.deucher@....com>, 
 Christian König <christian.koenig@....com>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 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>, 
 Sandy Huang <hjc@...k-chips.com>, 
 Heiko Stübner <heiko@...ech.de>, 
 Andy Yan <andy.yan@...k-chips.com>, 
 Jani Nikula <jani.nikula@...ux.intel.com>, 
 Rodrigo Vivi <rodrigo.vivi@...el.com>, 
 Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>, 
 Tvrtko Ursulin <tursulin@...ulin.net>, Dmitry Baryshkov <lumag@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, Rob Herring <robh@...nel.org>
Cc: kernel@...labora.com, amd-gfx@...ts.freedesktop.org, 
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org, 
 intel-gfx@...ts.freedesktop.org, intel-xe@...ts.freedesktop.org, 
 Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
Subject: [PATCH v5 16/17] drm/connector: Register color format property on
 HDMI connectors

The drmm_connector_hdmi_init function can figure out what DRM color
formats are supported by a particular connector based on the supported
HDMI format bitmask that's passed in.

Use it to register the drm color format property.

Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
---
 drivers/gpu/drm/drm_connector.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 13151d9bfb82..7c38123f99cd 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -578,6 +578,7 @@ int drmm_connector_hdmi_init(struct drm_device *dev,
 			     unsigned long supported_formats,
 			     unsigned int max_bpc)
 {
+	u32 supported_drm_formats = 0;
 	int ret;
 
 	if (!vendor || !product)
@@ -621,6 +622,18 @@ int drmm_connector_hdmi_init(struct drm_device *dev,
 	if (max_bpc > 8)
 		drm_connector_attach_hdr_output_metadata_property(connector);
 
+	if (supported_formats & BIT(HDMI_COLORSPACE_RGB))
+		supported_drm_formats |= DRM_COLOR_FORMAT_RGB444;
+	if (supported_formats & BIT(HDMI_COLORSPACE_YUV444))
+		supported_drm_formats |= DRM_COLOR_FORMAT_YCBCR444;
+	if (supported_formats & BIT(HDMI_COLORSPACE_YUV422))
+		supported_drm_formats |= DRM_COLOR_FORMAT_YCBCR422;
+	if (supported_formats & BIT(HDMI_COLORSPACE_YUV420))
+		supported_drm_formats |= DRM_COLOR_FORMAT_YCBCR420;
+
+	if (!drm_mode_create_color_format_property(connector, supported_drm_formats))
+		drm_connector_attach_color_format_property(connector);
+
 	connector->hdmi.funcs = hdmi_funcs;
 
 	return 0;

-- 
2.52.0