On Mon, Dec 02, 2019 at 09:49:35AM +0100, Daniel Vetter wrote:
On Mon, Dec 02, 2019 at 05:55:06AM +0000, james qian wang (Arm Technology China) wrote:
On Tue, Nov 26, 2019 at 01:15:59PM +0000, Mihail Atanassov wrote:
A simple convenience function to initialize the struct drm_bridge.
Signed-off-by: Mihail Atanassov mihail.atanassov@arm.com
drivers/gpu/drm/drm_bridge.c | 29 +++++++++++++++++++++++++++++ include/drm/drm_bridge.h | 4 ++++ 2 files changed, 33 insertions(+)
diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c index cba537c99e43..cbe680aa6eac 100644 --- a/drivers/gpu/drm/drm_bridge.c +++ b/drivers/gpu/drm/drm_bridge.c @@ -89,6 +89,35 @@ void drm_bridge_remove(struct drm_bridge *bridge) } EXPORT_SYMBOL(drm_bridge_remove);
+/**
- drm_bridge_init - initialise a drm_bridge structure
- @bridge: bridge control structure
- @funcs: control functions
- @dev: device
- @timings: timing specification for the bridge; optional (may be NULL)
- @driver_private: pointer to the bridge driver internal context (may be NULL)
- */
+void drm_bridge_init(struct drm_bridge *bridge, struct device *dev,
const struct drm_bridge_funcs *funcs,const struct drm_bridge_timings *timings,void *driver_private)+{
- WARN_ON(!funcs);
- bridge->dev = NULL;
- bridge->encoder = NULL;
- bridge->next = NULL;
+#ifdef CONFIG_OF
- bridge->of_node = dev->of_node;
+#endif
- bridge->timings = timings;
- bridge->funcs = funcs;
- bridge->driver_private = driver_private;
Can we directly put drm_bridge_add() here. then
- User always need to call bridge_init and add together.
- Consistent with others like drm_plane/crtc_init which directly has drm_mode_object_add() in it.
Uh no, the trouble here is that drm_bridge_add should actually be called _register, because it publishes the bridge to the world. I think we even have a todo item to rename _add to _register ... Once that's done the bridge can't be changed anymore, all init code must have completed. So often you need a bit of code between _init() and _register().
drm_mode_object_add is different since for mode objects it doesn't publish it to the world, that's done with drm_dev_register and drm_connector_register. drm_mode_object_add just does a bit of internal house keeping. -Daniel
Yes, the name _register() is more better.
And thank you for such detailed explanation.
Thanks James
James.
+} +EXPORT_SYMBOL(drm_bridge_init);
/**
- drm_bridge_attach - attach the bridge to an encoder's chain
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h index c0a2286a81e9..d6d9d5301551 100644 --- a/include/drm/drm_bridge.h +++ b/include/drm/drm_bridge.h @@ -402,6 +402,10 @@ struct drm_bridge {
void drm_bridge_add(struct drm_bridge *bridge); void drm_bridge_remove(struct drm_bridge *bridge); +void drm_bridge_init(struct drm_bridge *bridge, struct device *dev,
const struct drm_bridge_funcs *funcs,const struct drm_bridge_timings *timings,void *driver_private);struct drm_bridge *of_drm_find_bridge(struct device_node *np); int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge, struct drm_bridge *previous);
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-- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch
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