linux-kernel - [PATCH 1/6] drm/display: bridge_connector: handle ycbcr_420

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Message-Id: <20241019-bridge-yuv420-v1-1-d74efac9e4e6@linaro.org>
Date: Sat, 19 Oct 2024 00:49:12 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: 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>, 
 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>, 
 Rob Clark <robdclark@...il.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>, 
 Sean Paul <sean@...rly.run>, Marijn Suijten <marijn.suijten@...ainline.org>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org
Subject: [PATCH 1/6] drm/display: bridge_connector: handle
 ycbcr_420_allowed

Follow the interlace_allowed example and calculate drm_connector's
ycbcr_420_allowed flag as AND of all drm_bridge's ycbcr_420_allowed
flags in a chain. This is one of the gaps between several
bridge-specific connector implementations and drm_bridge_connector.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 drivers/gpu/drm/display/drm_bridge_connector.c | 6 ++++--
 include/drm/drm_bridge.h                       | 5 +++++
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/display/drm_bridge_connector.c b/drivers/gpu/drm/display/drm_bridge_connector.c
index 3da5b8bf8259..320c297008aa 100644
--- a/drivers/gpu/drm/display/drm_bridge_connector.c
+++ b/drivers/gpu/drm/display/drm_bridge_connector.c
@@ -397,11 +397,11 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
 	bridge_connector->encoder = encoder;
 
 	/*
-	 * TODO: Handle doublescan_allowed, stereo_allowed and
-	 * ycbcr_420_allowed.
+	 * TODO: Handle doublescan_allowed and stereo_allowed.
 	 */
 	connector = &bridge_connector->base;
 	connector->interlace_allowed = true;
+	connector->ycbcr_420_allowed = true;
 
 	/*
 	 * Initialise connector status handling. First locate the furthest
@@ -414,6 +414,8 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
 	drm_for_each_bridge_in_chain(encoder, bridge) {
 		if (!bridge->interlace_allowed)
 			connector->interlace_allowed = false;
+		if (!bridge->ycbcr_420_allowed)
+			connector->ycbcr_420_allowed = false;
 
 		if (bridge->ops & DRM_BRIDGE_OP_EDID)
 			bridge_connector->bridge_edid = bridge;
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index 75019d16be64..e8d735b7f6a4 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -802,6 +802,11 @@ struct drm_bridge {
 	 * modes.
 	 */
 	bool interlace_allowed;
+	/**
+	 * @ycbcr_420_allowed: Indicate that the bridge can handle YCbCr 420
+	 * output.
+	 */
+	bool ycbcr_420_allowed;
 	/**
 	 * @pre_enable_prev_first: The bridge requires that the prev
 	 * bridge @pre_enable function is called before its @pre_enable,

-- 
2.39.5