[PATCH 1/6] drm/display: bridge_connector: handle ycbcr_420_allowed

[Dmitry Baryshkov]

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 at linaro.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