linux-kernel - [PATCH v4 06/10] drm/rockchip: dw_hdmi_qp: Set supported

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Message-Id: <20251117-color-format-v4-6-0ded72bd1b00@collabora.com>
Date: Mon, 17 Nov 2025 20:11:50 +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 06/10] drm/rockchip: dw_hdmi_qp: Set supported_formats
 platdata

With the introduction of the supported_formats member in the
dw-hdmi-qp platform data struct, drivers that have access to this
information should now set it.

Set it in the rockchip dw_hdmi_qp glue driver, where such a bitmask of
supported color formats already exists. It just needs to be converted to
the appropriate HDMI_COLORSPACE_ mask.

This allows this information to be passed down to the dw-hdmi-qp core,
which sets it in the bridge it creates, and consequently will allow the
common HDMI bridge code to act on it.

Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
---
 drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c b/drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c
index c9fe6aa3e3e3..7c294751de19 100644
--- a/drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c
@@ -468,6 +468,28 @@ static const struct of_device_id dw_hdmi_qp_rockchip_dt_ids[] = {
 };
 MODULE_DEVICE_TABLE(of, dw_hdmi_qp_rockchip_dt_ids);
 
+static const u32 supported_colorformats = DRM_COLOR_FORMAT_AUTO |
+					  DRM_COLOR_FORMAT_RGB444 |
+					  DRM_COLOR_FORMAT_YCBCR444;
+
+static unsigned int __pure drm_to_hdmi_fmts(const u32 fmt)
+{
+	unsigned int res = 0;
+
+	if (fmt & DRM_COLOR_FORMAT_AUTO)
+		res |= BIT(HDMI_COLORSPACE_RGB);
+	if (fmt & DRM_COLOR_FORMAT_RGB444)
+		res |= BIT(HDMI_COLORSPACE_RGB);
+	if (fmt & DRM_COLOR_FORMAT_YCBCR444)
+		res |= BIT(HDMI_COLORSPACE_YUV444);
+	if (fmt & DRM_COLOR_FORMAT_YCBCR422)
+		res |= BIT(HDMI_COLORSPACE_YUV422);
+	if (fmt & DRM_COLOR_FORMAT_YCBCR420)
+		res |= BIT(HDMI_COLORSPACE_YUV420);
+
+	return res;
+}
+
 static int dw_hdmi_qp_rockchip_bind(struct device *dev, struct device *master,
 				    void *data)
 {
@@ -521,6 +543,8 @@ static int dw_hdmi_qp_rockchip_bind(struct device *dev, struct device *master,
 	plat_data.phy_data = hdmi;
 	plat_data.max_bpc = 10;
 
+	plat_data.supported_formats = drm_to_hdmi_fmts(supported_colorformats);
+
 	encoder = &hdmi->encoder.encoder;
 	encoder->possible_crtcs = drm_of_find_possible_crtcs(drm, dev->of_node);
 

-- 
2.51.2