[PATCH v5 25/25] drm/tilcdc: Add support for DRM_BRIDGE_ATTACH_NO_CONNECTOR
From: "Kory Maincent (TI.com)" <kory.maincent@bootlin.com>
Date: 2026-01-23 16:13:59
Also in:
dri-devel, linux-devicetree, linux-omap, lkml
Subsystem:
drm drivers, drm drivers and misc gpu patches, drm drivers for ti lcdc, the rest · Maintainers:
David Airlie, Simona Vetter, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Jyri Sarha, Tomi Valkeinen, Linus Torvalds
Convert the driver to use the DRM_BRIDGE_ATTACH_NO_CONNECTOR flag when attaching bridges. This modernizes the driver by delegating connector creation to the bridge subsystem through drm_bridge_connector_init() instead of manually searching for connectors created by the bridge. The custom tilcdc_encoder_find_connector() function is removed and replaced with the standard drm_bridge_connector infrastructure, which simplifies the code and aligns with current DRM bridge best practices. This change is safe as there are now no in-tree devicetrees that connect tilcdc to bridges which do not support the DRM_BRIDGE_ATTACH_NO_CONNECTOR flag. Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com> Signed-off-by: Kory Maincent (TI.com) <kory.maincent@bootlin.com> --- Changes in v5: - Move DRM_DISPLAY_HELPER before DRM_BRIDGE_CONNECTOR for a more logical description. Changes in v4: - Select missing DRM_BRIDGE_CONNECTOR and DRM_DISPLAY_HELPER config dependency in Kconfig --- drivers/gpu/drm/tilcdc/Kconfig | 2 ++ drivers/gpu/drm/tilcdc/tilcdc_encoder.c | 37 ++++++++++++++------------------- 2 files changed, 18 insertions(+), 21 deletions(-)
diff --git a/drivers/gpu/drm/tilcdc/Kconfig b/drivers/gpu/drm/tilcdc/Kconfig
index a36e809f984cd..89df7528756c8 100644
--- a/drivers/gpu/drm/tilcdc/Kconfig
+++ b/drivers/gpu/drm/tilcdc/Kconfig@@ -6,6 +6,8 @@ config DRM_TILCDC select DRM_KMS_HELPER select DRM_GEM_DMA_HELPER select DRM_BRIDGE + select DRM_DISPLAY_HELPER + select DRM_BRIDGE_CONNECTOR select DRM_PANEL_BRIDGE select VIDEOMODE_HELPERS select BACKLIGHT_CLASS_DEVICE
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_encoder.c b/drivers/gpu/drm/tilcdc/tilcdc_encoder.c
index 546fe7e6ee815..680a2ac6ab594 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_encoder.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_encoder.c@@ -8,45 +8,40 @@ #include <drm/drm_atomic_helper.h> #include <drm/drm_bridge.h> +#include <drm/drm_bridge_connector.h> #include <drm/drm_of.h> #include <drm/drm_simple_kms_helper.h> #include "tilcdc_drv.h" #include "tilcdc_encoder.h" -static -struct drm_connector *tilcdc_encoder_find_connector(struct drm_device *ddev, - struct drm_encoder *encoder) -{ - struct drm_connector *connector; - - list_for_each_entry(connector, &ddev->mode_config.connector_list, head) { - if (drm_connector_has_possible_encoder(connector, encoder)) - return connector; - } - - drm_err(ddev, "No connector found for %s encoder (id %d)\n", - encoder->name, encoder->base.id); - - return NULL; -} - static int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge) { struct tilcdc_drm_private *priv = ddev_to_tilcdc_priv(ddev); + struct drm_connector *connector; int ret; priv->encoder->base.possible_crtcs = BIT(0); - ret = drm_bridge_attach(&priv->encoder->base, bridge, NULL, 0); + ret = drm_bridge_attach(&priv->encoder->base, bridge, NULL, + DRM_BRIDGE_ATTACH_NO_CONNECTOR); if (ret) return ret; - priv->connector = tilcdc_encoder_find_connector(ddev, &priv->encoder->base); - if (!priv->connector) - return -ENODEV; + connector = drm_bridge_connector_init(ddev, &priv->encoder->base); + if (IS_ERR(connector)) { + drm_err(ddev, "bridge_connector create failed\n"); + return PTR_ERR(connector); + } + + ret = drm_connector_attach_encoder(connector, &priv->encoder->base); + if (ret) { + drm_err(ddev, "attaching encoder to connector failed\n"); + return ret; + } + priv->connector = connector; return 0; }
--
2.43.0