linux-kernel - [PATCH v3 07/15] drm/connector: hdmi: Use YUV420 output format as an RGB fallback

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Message-Id: <20250326-hdmi-conn-yuv-v3-7-294d3ebbb4b2@collabora.com>
Date: Wed, 26 Mar 2025 12:19:56 +0200
From: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
To: 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>, 
 Dave Stevenson <dave.stevenson@...pberrypi.com>, 
 Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: kernel@...labora.com, dri-devel@...ts.freedesktop.org, 
 linux-kernel@...r.kernel.org
Subject: [PATCH v3 07/15] drm/connector: hdmi: Use YUV420 output format as
 an RGB fallback

Try to make use of YUV420 when computing the best output format and
RGB cannot be supported for any of the available color depths.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
---
 drivers/gpu/drm/display/drm_hdmi_state_helper.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
index 6de0abb15ecb36fd4eb98725e2a3835e5e0db134..3859600c6af4a79f30858adfc9f9a710dfe561a5 100644
--- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c
+++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
@@ -650,7 +650,17 @@ hdmi_compute_config(const struct drm_connector *connector,
 
 	ret = hdmi_compute_format_bpc(connector, conn_state, mode, max_bpc,
 				      HDMI_COLORSPACE_RGB);
+	if (!ret)
+		return 0;
 
+	if (!connector->ycbcr_420_allowed) {
+		drm_dbg_kms(connector->dev,
+			    "YUV420 output format not allowed for connector.\n");
+		return -EINVAL;
+	}
+
+	ret = hdmi_compute_format_bpc(connector, conn_state, mode, max_bpc,
+				      HDMI_COLORSPACE_YUV420);
 	return ret;
 }
 

-- 
2.49.0