linux-kernel - [PATCH v4 07/10] drm/display: hdmi-state-helper: Act on color format DRM property

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Message-Id: <20251117-color-format-v4-7-0ded72bd1b00@collabora.com>
Date: Mon, 17 Nov 2025 20:11:51 +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>
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 v4 07/10] drm/display: hdmi-state-helper: Act on color
 format DRM property

With the introduction of the "color format" DRM property, which allows
userspace to request a specific color format, the HDMI state helper
should implement this.

Implement it by checking whether the property is set and set to
something other than auto. If so, pass the requested color format, and
otherwise set RGB.

Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
---
 drivers/gpu/drm/display/drm_hdmi_state_helper.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
index a561f124be99..add0d51fce33 100644
--- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c
+++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
@@ -650,9 +650,15 @@ hdmi_compute_config(const struct drm_connector *connector,
 				       conn_state->max_bpc,
 				       8, connector->max_bpc);
 	int ret;
+	enum hdmi_colorspace hdmi_colorspace;
+
+	if (conn_state->color_format && conn_state->color_format != DRM_COLOR_FORMAT_AUTO)
+		hdmi_colorspace = color_format_to_hdmi_colorspace(conn_state->color_format);
+	else
+		hdmi_colorspace = HDMI_COLORSPACE_RGB;
 
 	ret = hdmi_compute_format_bpc(connector, conn_state, mode, max_bpc,
-				      HDMI_COLORSPACE_RGB);
+				      hdmi_colorspace);
 	if (ret) {
 		if (connector->ycbcr_420_allowed) {
 			ret = hdmi_compute_format_bpc(connector, conn_state,

-- 
2.51.2