diff options
Diffstat (limited to 'drivers/gpu/drm/drm_bridge.c')
| -rw-r--r-- | drivers/gpu/drm/drm_bridge.c | 46 |
1 files changed, 34 insertions, 12 deletions
diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c index 0ee052b7c21a..850bd6509ef1 100644 --- a/drivers/gpu/drm/drm_bridge.c +++ b/drivers/gpu/drm/drm_bridge.c @@ -26,6 +26,7 @@ #include <linux/mutex.h> #include <drm/drm_bridge.h> +#include <drm/drm_encoder.h> /** * DOC: overview @@ -92,32 +93,53 @@ void drm_bridge_remove(struct drm_bridge *bridge) EXPORT_SYMBOL(drm_bridge_remove); /** - * drm_bridge_attach - associate given bridge to our DRM device + * drm_bridge_attach - attach the bridge to an encoder's chain * - * @dev: DRM device - * @bridge: bridge control structure + * @encoder: DRM encoder + * @bridge: bridge to attach + * @previous: previous bridge in the chain (optional) * - * Called by a kms driver to link one of our encoder/bridge to the given - * bridge. + * Called by a kms driver to link the bridge to an encoder's chain. The previous + * argument specifies the previous bridge in the chain. If NULL, the bridge is + * linked directly at the encoder's output. Otherwise it is linked at the + * previous bridge's output. * - * Note that setting up links between the bridge and our encoder/bridge - * objects needs to be handled by the kms driver itself. + * If non-NULL the previous bridge must be already attached by a call to this + * function. * * RETURNS: * Zero on success, error code on failure */ -int drm_bridge_attach(struct drm_device *dev, struct drm_bridge *bridge) +int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge, + struct drm_bridge *previous) { - if (!dev || !bridge) + int ret; + + if (!encoder || !bridge) + return -EINVAL; + + if (previous && (!previous->dev || previous->encoder != encoder)) return -EINVAL; if (bridge->dev) return -EBUSY; - bridge->dev = dev; + bridge->dev = encoder->dev; + bridge->encoder = encoder; + + if (bridge->funcs->attach) { + ret = bridge->funcs->attach(bridge); + if (ret < 0) { + bridge->dev = NULL; + bridge->encoder = NULL; + return ret; + } + } - if (bridge->funcs->attach) - return bridge->funcs->attach(bridge); + if (previous) + previous->next = bridge; + else + encoder->bridge = bridge; return 0; } |