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.

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20241019-bridge-yuv420-v1-1-d74efac9e4e6@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

diff --git a/drivers/gpu/drm/display/drm_bridge_connector.c b/drivers/gpu/drm/display/drm_bridge_connector.c
index 3da5b8b..320c297 100644 (file)
--- 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 75019d1..e8d735b 100644 (file)
--- 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,