linux-kernel - [PATCH v4 03/10] drm: Add enum conversion from/to HDMI_COLORSPACE to DRM_COLOR

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Message-Id: <20251117-color-format-v4-3-0ded72bd1b00@collabora.com>
Date: Mon, 17 Nov 2025 20:11:47 +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>, 
 Marius Vlad <marius.vlad@...labora.com>
Subject: [PATCH v4 03/10] drm: Add enum conversion from/to HDMI_COLORSPACE
 to DRM_COLOR_FORMAT

From: Marius Vlad <marius.vlad@...labora.com>

This would please the compiler to have a enum transformation from one to
another even though the values are the same. It should also make things
obvious that we use different enums.

Signed-off-by: Marius Vlad <marius.vlad@...labora.com>
---
 drivers/gpu/drm/drm_connector.c | 18 ++++++++++++++++++
 include/drm/drm_connector.h     |  3 +++
 2 files changed, 21 insertions(+)

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 0ad7be0a2d09..61c077b67ac3 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -1384,6 +1384,24 @@ drm_color_format_enum_to_color_format(enum drm_color_format_enum fmt_enum)
 	}
 }
 
+enum hdmi_colorspace
+color_format_to_hdmi_colorspace(enum drm_color_format fmt)
+{
+	switch (fmt) {
+	default:
+	case DRM_COLOR_FORMAT_AUTO:
+	case DRM_COLOR_FORMAT_RGB444:
+		return HDMI_COLORSPACE_RGB;
+	case DRM_COLOR_FORMAT_YCBCR444:
+		return HDMI_COLORSPACE_YUV444;
+	case DRM_COLOR_FORMAT_YCBCR422:
+		return HDMI_COLORSPACE_YUV422;
+	case DRM_COLOR_FORMAT_YCBCR420:
+		return HDMI_COLORSPACE_YUV420;
+	}
+}
+EXPORT_SYMBOL(color_format_to_hdmi_colorspace);
+
 /**
  * drm_get_color_format_name - return a string for color format
  * @colorspace: color format to compute name of
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index a071079fd3ad..e044976c8d76 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -2586,6 +2586,9 @@ drm_color_format_to_color_format_enum(enum drm_color_format fmt);
 u32
 drm_color_format_enum_to_color_format(enum drm_color_format_enum fmt_enum);
 
+enum hdmi_colorspace
+color_format_to_hdmi_colorspace(enum drm_color_format fmt);
+
 /**
  * drm_for_each_connector_iter - connector_list iterator macro
  * @connector: &struct drm_connector pointer used as cursor

-- 
2.51.2